#The waveguide is specified by a Block (parallelepiped) of size ∞×1×∞, with ε=12
#centered at (0,0) which is the center of the cell. By default, any place where
#there are no objects there is air (ε=1)
sources = [
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(-7, 0))
]
#We gave the source a frequency of 0.15, and specified a ContinuousSource which is
#just a fixed-frequency sinusoid exp(−iωt) that by default is turned on at t=0
# frequency is specified in units of 2πc, which is equivalent to the inverse of the
#vacuum wavelength. Thus, 0.15 corresponds to a vacuum wavelength of about 1/0.15=6.67 μm,
#or a wavelength of about 2 μm in the ε=12 material
pml_layers = [mp.PML(1.0)]
#boundry conditions that absorb around the cell
#absorbing boundries handled by perfectly matched layers (PML)
#this adds absorbing layer thickness of 1 um around all sides of cell
resolution = 10
#this gives resolution of 10 pixels per um
sim = mp.Simulation(cell_size=cell,
boundary_layers=pml_layers,
geometry=geometry,
sources=sources,
resolution=resolution)
#this is the simulation based on all previously defined objects
sim.run(until=200)
w2 = 2.0 # width of waveguide 2
Lw = 10.0 # length of waveguides 1 and 2
# lengths of waveguide taper
Lts = [2**m for m in range(5)]
dair = 3.0 # length of air region
dpml_x = 6.0 # length of PML in x direction
dpml_y = 2.0 # length of PML in y direction
sy = dpml_y + dair + w2 + dair + dpml_y
Si = mp.Medium(epsilon=12.0)
boundary_layers = [
mp.PML(dpml_x, direction=mp.X),
mp.PML(dpml_y, direction=mp.Y)
]
lcen = 6.67 # mode wavelength
fcen = 1 / lcen # mode frequency
symmetries = [mp.Mirror(mp.Y)]
R_coeffs = []
R_flux = []
for Lt in Lts:
sx = dpml_x + Lw + Lt + Lw + dpml_x
cell_size = mp.Vector3(sx, sy, 0)
def __init__(self, dir_name, wavelength, thy_absorb, cyt_absorb):
self.base_directory = base_directory + str(dir_name)
self.wavelength = wavelength
self.thy_absorb = thy_absorb
self.cyt_absorb = cyt_absorb
self.frequency = 1 / wavelength
# Calculate wavelengths dependent on RI
self.wavelength_in_media = wavelength / ri_media
self.wavelength_in_cytoplasm = wavelength / ri_cytoplasm
self.wavelength_in_thylakoid = wavelength / ri_thylakoid
max_freq = self.frequency - 0.01
min_freq = self.frequency + 0.01
self.pulse_width = abs(max_freq - min_freq)
cell = mp.Vector3(sxx, sxy, 0)
pml_layers = [mp.PML(dpml)]
thylakoid_material = mp.Medium(index=ri_thylakoid,
D_conductivity=2 * math.pi *
self.frequency * (thy_absorb /
(ri_thylakoid**2)))
cytoplasm_material = mp.Medium(index=ri_cytoplasm,
D_conductivity=2 * math.pi *
self.frequency * (cyt_absorb /
(ri_cytoplasm**2)))
thylakoid_region = mp.Sphere(radius=cell_radius,
center=mp.Vector3(0, 0),
material=thylakoid_material)
cytoplasm_region = mp.Sphere(radius=cell_radius - thylakoid_thickness,
center=mp.Vector3(0, 0),
material=cytoplasm_material)
geometry = [thylakoid_region, cytoplasm_region]
# Sources
kdir = mp.Vector3(1, 0, 0) # direction of k (length is irrelevant)
n = ri_media # refractive index of material containing the source
k = kdir.unit().scale(2 * math.pi * self.frequency *
n) # k with correct length
def pw_amp(k, x0):
def _pw_amp(x):
return cmath.exp(1j * k.dot(x + x0))
return _pw_amp
source = [
mp.Source(
mp.ContinuousSource(frequency=self.frequency,
fwidth=self.pulse_width), # along x axis
component=mp.Ez,
center=mp.Vector3(-0.5 * simulation_size, 0), # x, ,y ,z
size=mp.Vector3(0, sxy, 0),
amp_func=pw_amp(k, mp.Vector3(x=-0.5 * simulation_size)))
]
sim = mp.Simulation(
cell_size=cell,
sources=source,
boundary_layers=pml_layers,
resolution=resolution,
geometry=geometry,
default_material=mp.Medium(index=ri_media),
force_complex_fields=complex_f,
eps_averaging=eps_av,
)
sim.use_output_directory(self.base_directory)
sim.run(mp.at_every(
0.6,
mp.output_png(mp.Ez,
"-Zc/data/home/bt16268/simInput/customColour.txt")),
until=t)
pos_z = height + 0.005
pt = mp.Vector3(pos_x, pos_y, pos_z)
resolution = 150
numx = int(width_cal * resolution)
numy = int(height_cal * resolution)
x_list = np.linspace(-width_cal / 2, width_cal / 2, numx)
y_list = np.linspace(-height_cal / 2, height_cal / 2, numy)
x_grid, y_grid = np.meshgrid(x_list, y_list)
# %%
cell_size = mp.Vector3(length_cal, width_cal, height_cal)
pml_layers = [
mp.Absorber(thickness=t_pml, direction=mp.Y),
mp.PML(thickness=t_pml, direction=mp.Z),
mp.PML(thickness=t_pml, direction=mp.X)
]
# Y dipole
source = [
mp.Source(mp.ContinuousSource(frequency=omega), component=mp.Ey, center=pt)
]
# We first calculate the normalized power
sim0 = mp.Simulation(resolution=resolution,
cell_size=cell_size,
boundary_layers=pml_layers,
default_material=mp.Medium(index=index_SiN),
sources=source,
eps_averaging=False,
from autograd import numpy as npa
from autograd import tensor_jacobian_product
import unittest
from enum import Enum
MonitorObject = Enum('MonitorObject', 'EIGENMODE DFT')
resolution = 25
silicon = mp.Medium(epsilon=12)
sxy = 5.0
cell_size = mp.Vector3(sxy,sxy,0)
dpml = 1.0
boundary_layers = [mp.PML(thickness=dpml)]
eig_parity = mp.EVEN_Y + mp.ODD_Z
design_shape = mp.Vector3(1.5,1.5)
design_region_resolution = int(2*resolution)
Nx = int(design_region_resolution*design_shape.x)
Ny = int(design_region_resolution*design_shape.y)
## ensure reproducible results
np.random.seed(9861548)
## random design region
p = np.random.rand(Nx*Ny)
## random epsilon perturbation for design region
def main():
n = 3.4 # index of waveguide
r = 1
a = r # inner radius of ring
w = 1 # width of waveguide
b = a + w # outer radius of ring
pad = 4 # padding between waveguide and edge of PML
dpml = 2 # thickness of PML
pml_layers = [mp.PML(dpml)]
resolution = 100
sr = b + pad + dpml # radial size (cell is from 0 to sr)
dimensions = mp.CYLINDRICAL # coordinate system is (r,phi,z) instead of (x,y,z)
cell = mp.Vector3(sr, 0, 0)
m = 4
geometry = [
mp.Block(center=mp.Vector3(a + (w / 2)),
size=mp.Vector3(w, 1e20, 1e20),
material=mp.Medium(index=n))
]
# Finding a resonance mode with a high Q-value (calculated with Harminv)
fcen = 0.15 # pulse center frequency
df = 0.1 # pulse width (in frequency)
sources = [
mp.Source(mp.GaussianSource(fcen, fwidth=df),
mp.Hz,
mp.Vector3(r + 0.1),
amplitude=1)
]
sim = mp.Simulation(cell_size=cell,
geometry=geometry,
boundary_layers=pml_layers,
resolution=resolution,
sources=sources,
dimensions=dimensions,
m=m)
h = mp.Harminv(mp.Hz, mp.Vector3(r + 0.1), fcen, df)
sim.run(mp.after_sources(h), until_after_sources=200)
Harminv_freq_at_R = h.modes[0].freq
sim.reset_meep()
# now running the simulation that will be used with perturbation theory to calculate dw/dR
fcen = Harminv_freq_at_R
df = 0.01
sources = [
mp.Source(mp.GaussianSource(fcen, fwidth=df),
mp.Hz,
mp.Vector3(r + 0.1),
amplitude=1)
]
sim = mp.Simulation(cell_size=cell,
geometry=geometry,
boundary_layers=pml_layers,
resolution=resolution,
sources=sources,
dimensions=dimensions,
m=m)
sim.run(until_after_sources=200)
# now need to calculate the surface integrals that go into dw/dR. Fields parallel and perpendicular to the interface
# AND at the inner and outer surfaces are treated differently, so each will be calculated separately.
# section for fields at inner surface
npts_inner = 10
angles_inner = 2 * np.pi / npts_inner * np.arange(npts_inner)
deps_inner = 1 - n**2
deps_inv_inner = 1 - 1 / (n**2)
# section for fields parallel to interface (Ez and Ep)
parallel_fields_inner = []
for angle in angles_inner:
point = mp.Vector3(a, angle)
e_z_field = abs(sim.get_field_point(mp.Ez, point))**2
e_p_field = abs(sim.get_field_point(mp.Ep, point))**2
e_parallel_field = e_z_field + e_p_field
# fields have to be multiplied by Δε
e_parallel_field = deps_inner * e_parallel_field
parallel_fields_inner.append(e_parallel_field)
# section for fields perpendicular to interface (Er)
perpendicular_fields_inner = []
for angle in angles_inner:
point = mp.Vector3(a, angle)
e_r_field = abs(sim.get_field_point(mp.Er, point))**2
e_perpendicular_field = e_r_field
# fields have to be multiplied by Δ(1/ε) and ε**2
e_perpendicular_field = deps_inv_inner * (abs(
sim.get_epsilon_point(point, Harminv_freq_at_R))**
2) * e_perpendicular_field
perpendicular_fields_inner.append(e_perpendicular_field)
# section for fields at outer surface
npts_outer = npts_inner
angles_outer = 2 * np.pi / npts_outer * np.arange(npts_outer)
deps_outer = n**2 - 1
deps_inv_outer = -1 + 1 / (n**2)
# section for fields parallel to interface (Ez and Ep) parallel_fields_outer = []
parallel_fields_outer = []
for angle in angles_outer:
point = mp.Vector3(b, angle)
e_z_field = abs(sim.get_field_point(mp.Ez, point))**2
e_p_field = abs(sim.get_field_point(mp.Ep, point))**2
e_parallel_field = e_z_field + e_p_field
# fields have to be multiplied by Δε
e_parallel_field = deps_outer * e_parallel_field
parallel_fields_outer.append(e_parallel_field)
# section for fields perpendicular to interface (Er)
perpendicular_fields_outer = []
for angle in angles_inner:
point = mp.Vector3(b, angle)
e_r_field = abs(sim.get_field_point(mp.Er, point))
e_perpendicular_field = e_r_field**2
# fields have to be multiplied by Δ(1/ε) and ε**2
e_perpendicular_field = deps_inv_outer * (abs(
sim.get_epsilon_point(point, Harminv_freq_at_R))**
2) * e_perpendicular_field
perpendicular_fields_outer.append(e_perpendicular_field)
numerator_surface_integral = 2 * np.pi * b * (
mean([mean(parallel_fields_inner),
mean(parallel_fields_outer)]) - mean([
mean(perpendicular_fields_inner),
mean(perpendicular_fields_outer)
]))
denominator_surface_integral = sim.electric_energy_in_box(
center=mp.Vector3((b + pad / 2) / 2), size=mp.Vector3(b + pad / 2))
perturb_theory_dw_dR = -Harminv_freq_at_R * numerator_surface_integral / (
4 * denominator_surface_integral)
center_diff_dw_dR = []
Harminv_freqs_at_R_plus_dR = []
drs = np.logspace(start=-3, stop=-1, num=10)
for dr in drs:
sim.reset_meep()
w = 1 + dr # width of waveguide
b = a + w
print(f'The current dr is dr={dr}')
if len(Harminv_freqs_at_R_plus_dR) == 0:
fcen = Harminv_freq_at_R
else:
fcen = Harminv_freqs_at_R_plus_dR[-1]
df = 0.01
sources = [
mp.Source(mp.GaussianSource(fcen, fwidth=df), mp.Hz,
mp.Vector3(r + 0.1))
]
geometry = [
mp.Block(center=mp.Vector3(a + (w / 2)),
size=mp.Vector3(w, 1e20, 1e20),
material=mp.Medium(index=n))
]
sim = mp.Simulation(cell_size=cell,
geometry=geometry,
boundary_layers=pml_layers,
resolution=resolution,
sources=sources,
dimensions=dimensions,
m=m)
h = mp.Harminv(mp.Hz, mp.Vector3(r + 0.1), fcen, df)
sim.run(mp.after_sources(h), until_after_sources=200)
Harminv_freq_at_R_plus_dR = h.modes[0].freq
Harminv_freqs_at_R_plus_dR.append(Harminv_freq_at_R_plus_dR)
dw_dR = (Harminv_freq_at_R_plus_dR - Harminv_freq_at_R) / dr
center_diff_dw_dR.append(dw_dR)
relative_errors_dw_dR = [
abs((dw_dR - perturb_theory_dw_dR) / dw_dR)
for dw_dR in center_diff_dw_dR
]
perturb_predicted_freqs_at_R_plus_dR = [
dr * perturb_theory_dw_dR + Harminv_freq_at_R for dr in drs
]
relative_errors_freqs_at_R_plus_dR = [
abs((perturb_predicted_freqs_at_R_plus_dR[i] -
Harminv_freqs_at_R_plus_dR[i]) / Harminv_freqs_at_R_plus_dR[i])
for i in range(len(Harminv_freqs_at_R_plus_dR))
]
if mp.am_master():
plt.figure(dpi=150)
plt.loglog(drs, relative_errors_dw_dR, 'bo-', label='relative error')
plt.grid(True, which='both', ls='-')
plt.xlabel('perturbation amount $dr$')
plt.ylabel('relative error between $dω/dR$')
plt.legend(loc='upper right')
plt.title(
'Comparison of Perturbation Theory and \nCenter-Difference Calculations in Finding $dω/dR$'
)
plt.tight_layout()
# plt.show()
plt.savefig('ring_Hz_perturbation_theory.dw_dR_error.png')
plt.clf()
plt.figure(dpi=150)
plt.loglog(drs,
relative_errors_freqs_at_R_plus_dR,
'bo-',
label='relative error')
plt.grid(True, which='both', ls='-')
plt.xlabel('perturbation amount $dr$')
plt.ylabel('relative error between $ω(R+dR)$')
plt.legend(loc='upper left')
plt.title(
'Comparison of resonance frequencies at $R+dR$ predicted by\nperturbation theory and found with Harminv'
)
plt.tight_layout()
# plt.show()
plt.savefig('ring_Hz_perturbation_theory.freqs_error.png')
plt.clf()
def setup_sim(zDim=0):
cell = mp.Vector3(16, 8, zDim)
# A simple waveguide
geometry = [
mp.Block(mp.Vector3(mp.inf, 1, 1),
center=mp.Vector3(),
material=mp.Medium(epsilon=12))
]
# Add point sources
sources = [
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(-5, 0),
size=mp.Vector3(0, 0, 2)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(0, 2),
size=mp.Vector3(0, 0, 2)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(-1, 1),
size=mp.Vector3(0, 0, 2)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(-2, -2, 1),
size=mp.Vector3(0, 0, 0)),
]
# Add line sources
sources += [
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(0, 2, 2),
center=mp.Vector3(-6, 0)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(0, 2, 2),
center=mp.Vector3(0, 1))
]
# Add plane sources
sources += [
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(2, 2, 2),
center=mp.Vector3(-3, 0)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(2, 2, 2),
center=mp.Vector3(0, -2))
]
# Different pml layers
pml_layers = [
mp.PML(2.0, mp.X),
mp.PML(1.0, mp.Y, mp.Low),
mp.PML(1.5, mp.Y, mp.High),
mp.PML(1.5, mp.Z)
]
resolution = 10
sim = mp.Simulation(cell_size=cell,
boundary_layers=pml_layers,
geometry=geometry,
sources=sources,
resolution=resolution)
# Line monitor
sim.add_flux(
1, 0, 1,
mp.FluxRegion(center=mp.Vector3(5, 0, 0),
size=mp.Vector3(0, 4, 4),
direction=mp.X))
# Plane monitor
sim.add_flux(
1, 0, 1,
mp.FluxRegion(center=mp.Vector3(2, 0, 0),
size=mp.Vector3(4, 4, 4),
direction=mp.X))
return sim
def main(args):
resolution = 30
nSi = 3.45
Si = mp.Medium(index=nSi)
dpml = 1.0
sx = 5
sy = 3
cell = mp.Vector3(sx + 2 * dpml, sy + 2 * dpml)
pml_layers = mp.PML(dpml)
a = 1.0 # waveguide width
s = args.s # waveguide separation distance
geometry = [
mp.Block(center=mp.Vector3(-0.5 * (s + a)),
size=mp.Vector3(a, a, 1e20),
material=Si),
mp.Block(center=mp.Vector3(0.5 * (s + a)),
size=mp.Vector3(a, a, 1e20),
material=Si)
]
xodd = args.xodd
symmetries = [
mp.Mirror(mp.X, phase=-1.0 if xodd else 1.0),
mp.Mirror(mp.Y, phase=-1.0)
]
beta = 0.5
k_point = mp.Vector3(z=beta)
fcen = 0.22
df = 0.06
sources = [
mp.Source(src=mp.GaussianSource(fcen, fwidth=df),
component=mp.Ey,
center=mp.Vector3(-0.5 * (s + a)),
size=mp.Vector3(a, a)),
mp.Source(src=mp.GaussianSource(fcen, fwidth=df),
component=mp.Ey,
center=mp.Vector3(0.5 * (s + a)),
size=mp.Vector3(a, a),
amplitude=-1.0 if xodd else 1.0)
]
sim = mp.Simulation(resolution=resolution,
cell_size=cell,
boundary_layers=[pml_layers],
geometry=geometry,
symmetries=symmetries,
k_point=k_point,
sources=sources,
dimensions=3)
h = mp.Harminv(mp.Ey, mp.Vector3(0.5 * (s + a)), fcen, df)
sim.run(mp.after_sources(h), until_after_sources=200)
f = h.modes[0].freq
print("freq:, {}, {}".format(s, f))
sim.reset_meep()
new_sources = [
mp.EigenModeSource(src=mp.GaussianSource(f, fwidth=df),
component=mp.Ey,
size=mp.Vector3(a, a),
center=mp.Vector3(-0.5 * (s + a)),
eig_kpoint=k_point,
eig_match_freq=True,
eig_parity=mp.ODD_Y),
mp.EigenModeSource(src=mp.GaussianSource(f, fwidth=df),
component=mp.Ey,
size=mp.Vector3(a, a),
center=mp.Vector3(0.5 * (s + a)),
eig_kpoint=k_point,
eig_match_freq=True,
eig_parity=mp.ODD_Y,
amplitude=-1.0 if xodd else 1.0)
]
sim.change_sources(new_sources)
flx_reg = mp.FluxRegion(direction=mp.Z,
center=mp.Vector3(),
size=mp.Vector3(1.2 * (2 * a + s), 1.2 * a))
wvg_pwr = sim.add_flux(f, 0, 1, flx_reg)
frc_reg1 = mp.ForceRegion(mp.Vector3(0.5 * s),
mp.X,
weight=1.0,
size=mp.Vector3(y=a))
frc_reg2 = mp.ForceRegion(mp.Vector3(0.5 * s + a),
mp.X,
weight=-1.0,
size=mp.Vector3(y=a))
wvg_force = sim.add_force(f, 0, 1, frc_reg1, frc_reg2)
runtime = 5000
sim.run(until_after_sources=runtime)
sim.display_fluxes(wvg_pwr)
sim.display_forces(wvg_force)
def diff(ht,wvl_cen):
import meep as mp
import numpy as np
import math
import random
#450 1.674
#550 1.642
#650 1.629
if (wvl_cen == 0.45):
photoresist = mp.Medium(index=1.674) #波长为450nm时光刻胶的折射率
elif (wvl_cen == 0.55):
photoresist = mp.Medium(index=1.642) #波长为550nm时光刻胶的折射率
else:
photoresist = mp.Medium(index=1.629) #波长为650nm时光刻胶的折射率
## at least 8 pixels per smallest wavelength, i.e. np.floor(8/wvl_min)
resolution = 25.0
dpml=1.0 #PML厚度
dpad =2.0 #透镜与PML间距
dsub = 2.0 # substrate thickness
width = 0.5 #环的宽度
r= width*len(ht) #透镜的半径 50um
focal_length = 100.0 #焦距
spot_length=100 #far-field line length
ff_res = 10.0 #far-field resoluton
h = 1.25
NA = math.sin(math.atan(r/focal_length))
NA = round(NA, 3)
pml_layers = [mp.PML(thickness=dpml)]
sr=r+dpad+dpml
sz=dpml+dpad+h+dpad+dpml
#sz=dpml+dsub+h+dpad+dpml
cell_size =mp.Vector3(sr,0,sz)
#glass = mp.Medium(index=1.5) # substrate
#geometry = [mp.Block(material=glass,
# size=mp.Vector3(sr,0,dpml+dsub),
# center=mp.Vector3(0.5*sr,0,-0.5*sz+0.5*(dpml+dsub)))]
#
#for n in range (len(ht)):
# geometry.append(mp.Block(material=photoresist,
# size=mp.Vector3(width,0,ht[n]),
# center=mp.Vector3(width*n+0.5*width,0,-0.5*sz+dpml+dsub+0.5*ht[n]))) #透镜的结构
#geometry = [mp.Block(material=photoresist,
# size=mp.Vector3(width,0,ht[0]),
# center=mp.Vector3(0.5*width,0,-0.5*sz+dpml+dpad+0.5*ht[0]))]
#for n in range (1,len(ht)):
# geometry.append(mp.Block(material=photoresist,
# size=mp.Vector3(width,0,ht[n]),
# center=mp.Vector3(width*n+0.5*width,0,-0.5*sz+dpml+dpad+0.5*ht[n]))) #透镜的结构
geometry = [mp.Block(material=photoresist,
size=mp.Vector3(sr,0,dpml+dsub),
center=mp.Vector3(0.5*sr,0,-0.5*sz+0.5*(dpml+dsub)))]
for n in range (0,len(ht)):
geometry.append(mp.Block(material=photoresist,
size=mp.Vector3(width,0,ht[n]),
center=mp.Vector3((width*(n)+0.5*width),0,-0.5*sz+dpml+dsub+0.5*ht[n]))) #透镜的结构
#wvl_cen = 0.5
frq_cen = 1/wvl_cen
dfrq = 0.2*frq_cen
sources = [mp.Source(mp.GaussianSource(frq_cen,fwidth=dfrq,is_integrated=True),
component=mp.Er,
center=mp.Vector3(0.5*(sr),0,-0.5*sz+dpml),
size=mp.Vector3(sr)),
mp.Source(mp.GaussianSource(frq_cen,fwidth=dfrq,is_integrated=True),
component=mp.Ep,
center=mp.Vector3(0.5*(sr),0,-0.5*sz+dpml),
size=mp.Vector3(sr),
amplitude=-1j)]
sim = mp.Simulation(cell_size=cell_size,
boundary_layers=pml_layers,
resolution=resolution,
sources=sources,
geometry=geometry,
dimensions=mp.CYLINDRICAL,
m=-1)
## near-field monitor
n2f_obj = sim.add_near2far(frq_cen, 0, 1,
mp.Near2FarRegion(center=mp.Vector3(0.5*(sr-dpml),0,0.5*sz-dpml),size=mp.Vector3(sr-dpml)))
# mp.Near2FarRegion(center=mp.Vector3(sr-dpml,0,0.5*sz-0.5*(dsub+zh+dpad)),size=mp.Vector3(z=dsub+zh+dpad)))
sim.run(until_after_sources=100)
ff_r = sim.get_farfields(n2f_obj, ff_res, center=mp.Vector3(0.5*(sr-dpml),0,-0.5*sz+dpml+dsub+h+focal_length),size=mp.Vector3(sr-dpml))
E2_r = np.absolute(ff_r['Ex'])**2+np.absolute(ff_r['Ey'])**2+np.absolute(ff_r['Ez'])**2
E_sum = sum(E2_r)
n = round((1.5*(wvl_cen/(2*NA)))/(r/(len(E2_r)-1)))
#print ('n = %d' % n)
E = 0.0
for i in range (n):
E += E2_r[i]
return E/E_sum
def test_dft_energy(self):
resolution = 20
cell = mp.Vector3(10, 5)
geom = [
mp.Block(size=mp.Vector3(mp.inf, 1, mp.inf),
material=mp.Medium(epsilon=12))
]
pml = [mp.PML(1)]
fsrc = 0.15
sources = [
mp.EigenModeSource(src=mp.GaussianSource(frequency=fsrc,
fwidth=0.2 * fsrc),
center=mp.Vector3(-3),
size=mp.Vector3(y=5),
eig_band=1,
eig_parity=mp.ODD_Z + mp.EVEN_Y,
eig_match_freq=True)
]
sim = mp.Simulation(resolution=resolution,
cell_size=cell,
geometry=geom,
boundary_layers=pml,
sources=sources,
symmetries=[mp.Mirror(direction=mp.Y)])
flux = sim.add_flux(fsrc,
0,
1,
mp.FluxRegion(center=mp.Vector3(3),
size=mp.Vector3(y=5)),
decimation_factor=1)
energy = sim.add_energy(fsrc,
0,
1,
mp.EnergyRegion(center=mp.Vector3(3),
size=mp.Vector3(y=5)),
decimation_factor=1)
energy_decimated = sim.add_energy(fsrc,
0,
1,
mp.EnergyRegion(
center=mp.Vector3(3),
size=mp.Vector3(y=5)),
decimation_factor=10)
sim.run(until_after_sources=100)
res = sim.get_eigenmode_coefficients(flux, [1],
eig_parity=mp.ODD_Z + mp.EVEN_Y)
mode_vg = res.vgrp[0]
poynting_flux = mp.get_fluxes(flux)[0]
e_energy = mp.get_electric_energy(energy)[0]
ratio_vg = (0.5 * poynting_flux) / e_energy
m_energy = mp.get_magnetic_energy(energy)[0]
t_energy = mp.get_total_energy(energy)[0]
self.assertAlmostEqual(m_energy + e_energy, t_energy)
self.assertAlmostEqual(ratio_vg, mode_vg, places=3)
e_energy_decimated = mp.get_electric_energy(energy_decimated)[0]
m_energy_decimated = mp.get_magnetic_energy(energy_decimated)[0]
self.assertAlmostEqual(e_energy, e_energy_decimated, places=1)
self.assertAlmostEqual(m_energy, m_energy_decimated, places=1)
def _create_boundary_layers(self):
return [mp.PML(self.pml)]
def get_simulation(
component: Component,
extend_ports_length: Optional[float] = 4.0,
layer_stack: LayerStack = LAYER_STACK,
res: int = 20,
t_clad_top: float = 1.0,
t_clad_bot: float = 1.0,
tpml: float = 1.0,
clad_material: str = "SiO2",
is_3d: bool = False,
wl_min: float = 1.5,
wl_max: float = 1.6,
wl_steps: int = 50,
dfcen: float = 0.2,
port_source_name: str = 1,
port_field_monitor_name: str = 2,
port_margin: float = 0.5,
distance_source_to_monitors: float = 0.2,
) -> Dict[str, Any]:
"""Returns Simulation dict from gdsfactory.component
based on meep directional coupler example
https://meep.readthedocs.io/en/latest/Python_Tutorials/GDSII_Import/
https://support.lumerical.com/hc/en-us/articles/360042095873-Metamaterial-S-parameter-extraction
Args:
component: gf.Component
extend_ports_function: function to extend the ports for a component to ensure it goes beyond the PML
layer_to_thickness: Dict of layer number (int, int) to thickness (um)
res: resolution (pixels/um) For example: (10: 100nm step size)
t_clad_top: thickness for cladding above core
t_clad_bot: thickness for cladding below core
tpml: PML thickness (um)
clad_material: material for cladding
is_3d: if True runs in 3D
wavelengths: iterable of wavelengths to simulate
dfcen: delta frequency
sidewall_angle: in degrees
port_source_name: input port name
port_field_monitor_name:
port_margin: margin on each side of the port
distance_source_to_monitors: in (um) source goes before
Returns:
sim: simulation object
Make sure you visualize the simulation region with gf.before you simulate a component
.. code::
import gdsfactory as gf
import gmeep as gm
c = gf.components.bend_circular()
margin = 2
cm = gm.add_monitors(c)
gf.show(cm)
"""
layer_to_thickness = layer_stack.get_layer_to_thickness()
layer_to_material = layer_stack.get_layer_to_material()
layer_to_zmin = layer_stack.get_layer_to_zmin()
layer_to_sidewall_angle = layer_stack.get_layer_to_sidewall_angle()
wavelengths = np.linspace(wl_min, wl_max, wl_steps)
if port_source_name not in component.ports:
warnings.warn(
f"port_source_name={port_source_name} not in {component.ports.keys()}"
)
port_source = component.get_ports_list()[0]
port_source_name = port_source.name
warnings.warn(f"Selecting port_source_name={port_source_name} instead.")
if port_field_monitor_name not in component.ports:
warnings.warn(
f"port_field_monitor_name={port_field_monitor_name} not in {component.ports.keys()}"
)
port_field_monitor = (
component.get_ports_list()[0]
if len(component.ports) < 2
else component.get_ports_list()[1]
)
port_field_monitor_name = port_field_monitor.name
warnings.warn(
f"Selecting port_field_monitor_name={port_field_monitor_name} instead."
)
assert isinstance(
component, Component
), f"component needs to be a gf.Component, got Type {type(component)}"
component_extended = (
gf.components.extension.extend_ports(
component=component, length=extend_ports_length, centered=True
)
if extend_ports_length
else component
)
component = component.ref()
component.x = 0
component.y = 0
gf.show(component_extended)
component_extended.flatten()
component_extended = component_extended.ref()
# geometry_center = [component_extended.x, component_extended.y]
# geometry_center = [0, 0]
# print(geometry_center)
layers_thickness = [
layer_to_thickness[layer]
for layer in component.get_layers()
if layer in layer_to_thickness
]
t_core = max(layers_thickness)
cell_thickness = tpml + t_clad_bot + t_core + t_clad_top + tpml if is_3d else 0
cell_size = mp.Vector3(
component.xsize + 2 * tpml,
component.ysize + 2 * tpml,
cell_thickness,
)
geometry = []
layer_to_polygons = component_extended.get_polygons(by_spec=True)
for layer, polygons in layer_to_polygons.items():
if layer in layer_to_thickness and layer in layer_to_material:
height = layer_to_thickness[layer] if is_3d else mp.inf
zmin_um = layer_to_zmin[layer] if is_3d else 0
# center = mp.Vector3(0, 0, (zmin_um + height) / 2)
for polygon in polygons:
vertices = [mp.Vector3(p[0], p[1], zmin_um) for p in polygon]
material_name = layer_to_material[layer]
material = get_material(name=material_name)
geometry.append(
mp.Prism(
vertices=vertices,
height=height,
sidewall_angle=layer_to_sidewall_angle[layer],
material=material,
# center=center
)
)
freqs = 1 / wavelengths
fcen = np.mean(freqs)
frequency_width = dfcen * fcen
# Add source
port = component.ports[port_source_name]
angle = port.orientation
width = port.width + 2 * port_margin
size_x = width * abs(np.sin(angle * np.pi / 180))
size_y = width * abs(np.cos(angle * np.pi / 180))
size_x = 0 if size_x < 0.001 else size_x
size_y = 0 if size_y < 0.001 else size_y
size_z = cell_thickness - 2 * tpml if is_3d else 20
size = [size_x, size_y, size_z]
center = port.center.tolist() + [0] # (x, y, z=0)
field_monitor_port = component.ports[port_field_monitor_name]
field_monitor_point = field_monitor_port.center.tolist() + [0] # (x, y, z=0)
sources = [
mp.EigenModeSource(
src=mp.GaussianSource(fcen, fwidth=frequency_width),
size=size,
center=center,
eig_band=1,
eig_parity=mp.NO_PARITY if is_3d else mp.EVEN_Y + mp.ODD_Z,
eig_match_freq=True,
)
]
sim = mp.Simulation(
resolution=res,
cell_size=cell_size,
boundary_layers=[mp.PML(tpml)],
sources=sources,
geometry=geometry,
default_material=get_material(name=clad_material),
# geometry_center=geometry_center,
)
# Add port monitors dict
monitors = {}
for port_name in component.ports.keys():
port = component.ports[port_name]
angle = port.orientation
width = port.width + 2 * port_margin
size_x = width * abs(np.sin(angle * np.pi / 180))
size_y = width * abs(np.cos(angle * np.pi / 180))
size_x = 0 if size_x < 0.001 else size_x
size_y = 0 if size_y < 0.001 else size_y
size = mp.Vector3(size_x, size_y, size_z)
size = [size_x, size_y, size_z]
# if monitor has a source move monitor inwards
length = -distance_source_to_monitors if port_name == port_source_name else 0
xy_shifted = move_polar_rad_copy(
np.array(port.center), angle=angle * np.pi / 180, length=length
)
center = xy_shifted.tolist() + [0] # (x, y, z=0)
m = sim.add_mode_monitor(freqs, mp.ModeRegion(center=center, size=size))
m.z = 0
monitors[port_name] = m
return dict(
sim=sim,
cell_size=cell_size,
freqs=freqs,
monitors=monitors,
sources=sources,
field_monitor_point=field_monitor_point,
port_source_name=port_source_name,
)
from __future__ import division, print_function
import meep as mp
import math
resolution = 50
sxy = 4
dpml = 1
cell = mp.Vector3(sxy + 2 * dpml, sxy + 2 * dpml, 0)
pml_layers = mp.PML(dpml)
fcen = 1.0
df = 0.4
src_cmpt = mp.Ez
sources = mp.Source(src=mp.GaussianSource(fcen, fwidth=df),
center=mp.Vector3(),
component=src_cmpt)
if src_cmpt == mp.Ex:
symmetries = [mp.Mirror(mp.Y)]
elif src_cmpt == mp.Ey:
symmetries = [mp.Mirror(mp.X)]
elif src_cmpt == mp.Ez:
symmetries = [mp.Mirror(mp.X), mp.Mirror(mp.Y)]
sim = mp.Simulation(cell_size=cell,
resolution=resolution,
sources=[sources],
symmetries=symmetries,
sources = [
mp.Source(
mp.GaussianSource(frequency=frequency, fwidth=frequencyWidth),
component=mp.Ex,
center=mp.Vector3(0, 0, -materialThickness / 2),
)
]
geometry = [
mp.Block(mp.Vector3(mp.inf, mp.inf, materialThickness + pmlThickness),
center=mp.Vector3(0, 0, materialThickness / 2 + pmlThickness / 2),
material=mp.Medium(index=2))
]
pmlLayers = [mp.PML(1.0)]
simulation = mp.Simulation(cell_size=cellSize,
sources=sources,
resolution=resolution,
boundary_layers=pmlLayers,
k_point=kVector)
incidentRegion = mp.FluxRegion(center=mp.Vector3(0, 0, -materialThickness / 4))
incidentFluxMonitor = simulation.add_flux(frequency, frequencyWidth,
numberFrequencies, incidentRegion)
simulation.run(until_after_sources=mp.stop_when_fields_decayed(
20, mp.Ex, transmissionMonitorLocation, powerDecayTarget))
fieldEx = np.real(
simulation.get_array(center=mp.Vector3(0, 0, 0),
import meep as mp
import numpy as np
import matplotlib.pyplot as plt
resolution = 50 # pixels/μm
cell_size = mp.Vector3(14, 14)
pml_layers = [mp.PML(thickness=2)]
# rotation angle (in degrees) of waveguide, counter clockwise (CCW) around z-axis
rot_angle = np.radians(20)
w = 1.0 # width of waveguide
geometry = [
mp.Block(center=mp.Vector3(),
size=mp.Vector3(mp.inf, w, mp.inf),
e1=mp.Vector3(1).rotate(mp.Vector3(z=1), rot_angle),
e2=mp.Vector3(y=1).rotate(mp.Vector3(z=1), rot_angle),
material=mp.Medium(epsilon=12))
]
fsrc = 0.15 # frequency of eigenmode or constant-amplitude source
kx = 0.4 # initial guess for wavevector in x-direction of eigenmode
bnum = 1 # band number of eigenmode
kpoint = mp.Vector3(kx).rotate(mp.Vector3(z=1), rot_angle)
compute_flux = True # compute flux (True) or plot the field profile (False)
from __future__ import division
import meep as mp
import numpy as np
import matplotlib.pyplot as plt
import math
from meep.materials import Au
pml_layers = [mp.PML(0.4)]
#Au = mp.Medium(index=math.pow(6.9,(1/2)))
dpml = 0.4
minwavelength = 0.4
maxwavelength = 0.8
minf = 1 / maxwavelength
maxf = 1 / minwavelength
fcen = (maxf + minf) / 2
df = maxf - minf
nfreq = 100
resolution = 100
upperside_without_flux = []
otherside_without_flux = []
upperside_with_flux = []
lightside_with_flux = []
otherside_with_flux = []
indecentflux = []
for i in (np.arange(1, 5)):
r = i * 0.005
sx = 12 * r + 2 * dpml
cell = mp.Vector3(sx, sx)
import meep as mp
import numpy as np
import matplotlib.pyplot as plt
import PyMieScatt as ps
r = 1.0 # radius of sphere
frq_cen = 1.0
resolution = 20 # pixels/um
dpml = 0.5
dair = 1.5 # at least 0.5/frq_cen padding between source and near-field monitor
pml_layers = [mp.PML(thickness=dpml)]
s = 2 * (dpml + dair + r)
cell_size = mp.Vector3(s, s, s)
# circularly-polarized source with propagation axis along x
# is_integrated=True necessary for any planewave source extending into PML
sources = [
mp.Source(mp.GaussianSource(frq_cen,
fwidth=0.2 * frq_cen,
is_integrated=True),
center=mp.Vector3(-0.5 * s + dpml),
size=mp.Vector3(0, s, s),
component=mp.Ez),
mp.Source(mp.GaussianSource(frq_cen,
fwidth=0.2 * frq_cen,
is_integrated=True),
from meep.simulation import at_every
import numpy as np
results = []
for j in range(1, 10):
simruntime = 60
CdSe = mp.Medium(index=2.52)
Glass = mp.Medium(index=1.5)
ZnO = mp.Medium(index=2.21)
celly = 4
fingersize = 0.05 * j
cell = mp.Vector3(7.5, celly)
polarization = mp.Ez
pml_layers = [mp.Absorber(1, mp.X, mp.Low), mp.PML(1, mp.X, mp.High)]
resolution = 80
sources = [
mp.Source(mp.ContinuousSource(wavelength=0.550, end_time=20),
component=polarization,
center=mp.Vector3(-1.5, 0))
]
# sources.append(mp.Source(mp.ContinuousSource(wavelength=0.550, end_time=20),
# component=polarization,
# center=mp.Vector3(-1.6, 3)))
# sources.append(mp.Source(mp.ContinuousSource(wavelength=0.550, end_time=20),
# component=polarization,
period_line=period_line,
period_plane=period_plane,
plane_center=plane_center,
line_center=line_center,
plane_size=plane_size,
line_size=line_size,
time_is_after_source=time_is_after_source,
run_time=run_time,
series=series,
home=home)
#%% LAYOUT CONFIGURATION
cell_size = mp.Vector3(cell_width, cell_width, cell_width)
boundary_layers = [mp.PML(thickness=pml_width)]
source_center = -0.5*cell_width + pml_width
sources = [mp.Source(mp.ContinuousSource(wavelength=wlen,
is_integrated=is_integrated),
center=mp.Vector3(source_center),
size=mp.Vector3(0, cell_width, cell_width),
component=mp.Ez)]
symmetries = [mp.Mirror(mp.Y), mp.Mirror(mp.Z, phase=-1)]
enlapsed = []
path = os.path.join(home, folder, "{}Results".format(series))
if not os.path.isdir(path): vs.new_dir(path)
file = lambda f : os.path.join(path, f)
def _simulate(
wlens: List[float],
sim_region: goos.Box3d,
pml_thickness: List[float],
geometry: List[mp.GeometricObject],
resolution: float,
sources: List[SimSourceImpl],
outputs: List[SimOutputImpl],
sim_timing: SimulationTiming,
adjoint_grad_val: goos.ArrayFlow.Grad = None,
adjoint_sources: List[SimOutput] = None,
adjoint: bool = False,
) -> Tuple[List[goos.Flow], List[SimOutput]]:
"""Runs Meep EM simulation.
This function factors out the core Meep simulation functionality so that
we can run the simulation in another process. The idea is to pickle (dill)
the arguments to this function, which is sent to another process(es) to
run the simulation.
"""
# Note that we have to compute PML here because apparently `mp.PML` is
# a SWIG object, which cannot be pickled.
pml_layers = []
for thickness, direction, side in zip(
pml_thickness, [mp.X, mp.X, mp.Y, mp.Y, mp.Z, mp.Z],
[mp.Low, mp.High, mp.Low, mp.High, mp.Low, mp.High]):
pml_layers.append(mp.PML(thickness, direction=direction, side=side))
sim = mp.Simulation(
cell_size=sim_region.extents,
geometry_center=sim_region.center,
boundary_layers=pml_layers,
geometry=geometry,
sources=[],
resolution=resolution,
force_complex_fields=adjoint,
)
# Add the sources. Because the sources may depend on the permittivity
# distribution, we call `init_sim` to setup permittivity and then call
# `change_sources` to add the new source list.
sim.init_sim()
for src in sources:
src.before_sim(sim)
if adjoint:
for out, g in zip(adjoint_sources, adjoint_grad_val):
out.before_adjoint_sim(sim, g)
for out in outputs:
out.before_sim(sim)
stop_conds = [sim_timing.max_timesteps] + [
cond.build()
for cond in _generate_stopping_conds(sim_timing.stopping_conditions)
]
if sim_timing.until_after_sources:
sim.run(until_after_sources=stop_conds)
else:
sim.run(until=stop_conds)
results = [out.eval(sim) for out in outputs]
for out in outputs:
out.after_sim()
return results, outputs
def test_get_point(self):
sxy = 6 # cell size
dpml = 1 # thickness of PML
def sinusoid(p):
r = (p.x**2+p.y**2)**0.5
return mp.Medium(index=1.0+math.sin(2*math.pi*r)**2)
geometry = [mp.Block(center=mp.Vector3(),
size=mp.Vector3(sxy,sxy),
material=sinusoid)]
src = [mp.Source(mp.GaussianSource(1.0, fwidth=0.1),
component=mp.Ez,
center=mp.Vector3())]
sim = mp.Simulation(cell_size=mp.Vector3(sxy,sxy),
geometry=geometry,
sources=src,
k_point=mp.Vector3(),
resolution=20,
symmetries=[mp.Mirror(mp.X),mp.Mirror(mp.Y)],
boundary_layers=[mp.PML(dpml)])
sim.run(until_after_sources=100)
## reference values for Ez and epsilon from serial run
ez_ref = [ -0.0002065983,
-0.0001954795,
-0.0000453570,
0.0000311267,
-0.0000121473,
-0.0000410032,
-0.0000341301,
-0.0000275021,
-0.0000397990,
-0.0000351730,
0.0000079602,
0.0000227437,
-0.0001092821,
-0.0002202751,
-0.0001408186,
0.0006325076,
0.0024890489,
0.0027476069,
0.0014815873,
0.0004714913,
-0.0004332029,
-0.0007101315,
-0.0003818581,
-0.0000748507,
0.0001408819,
0.0001119776,
0.0000395008,
0.0000078844,
-0.0000010431 ]
eps_ref = [ 1.6458346134,
1.2752837068,
1.0974010956,
1.0398089537,
1.0465784716,
1.0779924737,
1.1059439286,
1.1135579291,
1.0971979186,
1.0653178566,
1.0391657283,
1.0513779677,
1.1466009312,
1.3882154483,
1.8496939317,
2.5617731415,
3.3788212533,
3.9019494270,
3.6743431894,
2.7285622651,
1.6635165033,
1.0891237010,
1.1485969863,
1.9498398061,
3.3100416367,
3.9038800599,
2.8471862395,
1.4742605488,
1.0370162714 ]
x = np.linspace(-0.865692,2.692867,29)
for j in range(x.size):
self.assertAlmostEqual(np.real(sim.get_field_point(mp.Ez, mp.Vector3(x[j],-0.394862))),ez_ref[j],places=10)
self.assertAlmostEqual(sim.get_epsilon_point(mp.Vector3(x[j],2.967158)),eps_ref[j],places=10)
def binary_grating_diffraction(gp, gh, gdc, theta):
resolution = 50 # pixels/μm
dpml = 1.0 # PML thickness
dsub = 3.0 # substrate thickness
dpad = 3.0 # length of padding between grating and PML
sx = dpml + dsub + gh + dpad + dpml
sy = gp
cell_size = mp.Vector3(sx, sy, 0)
pml_layers = [mp.PML(thickness=dpml, direction=mp.X)]
wvl = 0.5 # center wavelength
fcen = 1 / wvl # center frequency
df = 0.05 * fcen # frequency width
ng = 1.5
glass = mp.Medium(index=ng)
# rotation angle of incident planewave; counter clockwise (CCW) about Z axis, 0 degrees along +X axis
theta_in = math.radians(theta)
eig_parity = mp.EVEN_Z
# k (in source medium) with correct length (plane of incidence: XY)
k = mp.Vector3(fcen * ng).rotate(mp.Vector3(z=1), theta_in)
if theta_in == 0:
k = mp.Vector3()
eig_parity += mp.ODD_Y
def pw_amp(k, x0):
def _pw_amp(x):
return cmath.exp(1j * 2 * math.pi * k.dot(x + x0))
return _pw_amp
src_pt = mp.Vector3(-0.5 * sx + dpml, 0, 0)
sources = [
mp.Source(mp.GaussianSource(fcen, fwidth=df),
component=mp.Hz,
center=src_pt,
size=mp.Vector3(0, sy, 0),
amp_func=pw_amp(k, src_pt))
]
sim = mp.Simulation(resolution=resolution,
cell_size=cell_size,
boundary_layers=pml_layers,
k_point=k,
default_material=glass,
sources=sources)
tran_pt = mp.Vector3(0.5 * sx - dpml, 0, 0)
tran_mon = sim.add_flux(
fcen, 0, 1, mp.FluxRegion(center=tran_pt, size=mp.Vector3(0, sy, 0)))
sim.run(until_after_sources=50)
input_flux = mp.get_fluxes(tran_mon)
sim.reset_meep()
geometry = [
mp.Block(material=glass,
size=mp.Vector3(dpml + dsub, mp.inf, mp.inf),
center=mp.Vector3(-0.5 * sx + 0.5 * (dpml + dsub), 0, 0)),
mp.Block(material=glass,
size=mp.Vector3(gh, gdc * gp, mp.inf),
center=mp.Vector3(-0.5 * sx + dpml + dsub + 0.5 * gh, 0, 0))
]
sim = mp.Simulation(resolution=resolution,
cell_size=cell_size,
boundary_layers=pml_layers,
geometry=geometry,
k_point=k,
sources=sources)
tran_mon = sim.add_mode_monitor(
fcen, 0, 1, mp.FluxRegion(center=tran_pt, size=mp.Vector3(0, sy, 0)))
sim.run(until_after_sources=100)
# number of (non-evanescent) transmitted orders
nm_t = np.floor((fcen - k.y) * gp) - np.ceil((-fcen - k.y) * gp)
if theta_in == 0:
nm_t = nm_t / 2
nm_t = int(nm_t) + 1
bands = range(1, nm_t + 1)
if theta_in == 0:
orders = range(0, nm_t)
else:
orders = range(int(np.ceil((-fcen - k.y) * gp)),
int(np.floor((fcen - k.y) * gp)) + 1)
eig_sum = 0
dp_sum = 0
for band, order in zip(bands, orders):
res = sim.get_eigenmode_coefficients(tran_mon, [band],
eig_parity=eig_parity)
if res is not None:
tran_eig = abs(res.alpha[0, 0, 0])**2 / input_flux[0]
if theta_in == 0:
tran_eig = 0.5 * tran_eig
else:
tran_eig = 0
eig_sum += tran_eig
res = sim.get_eigenmode_coefficients(
tran_mon,
mp.DiffractedPlanewave((0, order, 0), mp.Vector3(0, 1, 0), 0, 1))
if res is not None:
tran_dp = abs(res.alpha[0, 0, 0])**2 / input_flux[0]
if (theta_in == 0) and (order == 0):
tran_dp = 0.5 * tran_dp
else:
tran_dp = 0
dp_sum += tran_dp
if theta_in == 0:
err = abs(tran_eig - tran_dp) / tran_eig
print("tran:, {:2d}, {:.8f}, {:2d}, {:.8f}, {:.8f}".format(
band, tran_eig, order, tran_dp, err))
else:
print("tran:, {:2d}, {:.8f}, {:2d}, {:.8f}".format(
band, tran_eig, order, tran_dp))
flux = mp.get_fluxes(tran_mon)
t_flux = flux[0] / input_flux[0]
if (theta_in == 0):
t_flux = 0.5 * t_flux
err = abs(dp_sum - t_flux) / t_flux
print("flux:, {:.8f}, {:.8f}, {:.8f}, {:.8f}".format(
eig_sum, dp_sum, t_flux, err))
import math
resolution = 60 # pixels/μm
dpml = 1.0 # PML thickness
dsub = 3.0 # substrate thickness
dpad = 3.0 # padding between grating and PML
gp = 10.0 # grating period
gh = 0.5 # grating height
gdc = 0.5 # grating duty cycle
sx = dpml + dsub + gh + dpad + dpml
sy = gp
cell_size = mp.Vector3(sx, sy, 0)
pml_layers = [mp.PML(thickness=dpml, direction=mp.X)]
wvl_min = 0.4 # min wavelength
wvl_max = 0.6 # max wavelength
fmin = 1 / wvl_max # min frequency
fmax = 1 / wvl_min # max frequency
fcen = 0.5 * (fmin + fmax) # center frequency
df = fmax - fmin # frequency width
src_pt = mp.Vector3(-0.5 * sx + dpml + 0.5 * dsub, 0, 0)
sources = [
mp.Source(mp.GaussianSource(fcen, fwidth=df),
component=mp.Ez,
center=src_pt,
size=mp.Vector3(0, sy, 0))
]
def main(args):
cell_zmax = 0.5 * cell_thickness if args.three_d else 0
cell_zmin = -0.5 * cell_thickness if args.three_d else 0
si_zmax = 0.5 * t_Si if args.three_d else 10
si_zmin = -0.5 * t_Si if args.three_d else -10
# read cell size, volumes for source region and flux monitors,
# and coupler geometry from GDSII file
upper_branch = mp.get_GDSII_prisms(silicon, gdsII_file, UPPER_BRANCH_LAYER,
si_zmin, si_zmax)
lower_branch = mp.get_GDSII_prisms(silicon, gdsII_file, LOWER_BRANCH_LAYER,
si_zmin, si_zmax)
cell = mp.GDSII_vol(gdsII_file, CELL_LAYER, cell_zmin, cell_zmax)
p1 = mp.GDSII_vol(gdsII_file, PORT1_LAYER, si_zmin, si_zmax)
p2 = mp.GDSII_vol(gdsII_file, PORT2_LAYER, si_zmin, si_zmax)
p3 = mp.GDSII_vol(gdsII_file, PORT3_LAYER, si_zmin, si_zmax)
p4 = mp.GDSII_vol(gdsII_file, PORT4_LAYER, si_zmin, si_zmax)
src_vol = mp.GDSII_vol(gdsII_file, SOURCE_LAYER, si_zmin, si_zmax)
# displace upper and lower branches of coupler (as well as source and flux regions)
if args.d != default_d:
delta_y = 0.5 * (args.d - default_d)
delta = mp.Vector3(y=delta_y)
p1.center += delta
p2.center -= delta
p3.center += delta
p4.center -= delta
src_vol.center += delta
cell.size += 2 * delta
for np in range(len(lower_branch)):
lower_branch[np].center -= delta
for nv in range(len(lower_branch[np].vertices)):
lower_branch[np].vertices[nv] -= delta
for np in range(len(upper_branch)):
upper_branch[np].center += delta
for nv in range(len(upper_branch[np].vertices)):
upper_branch[np].vertices[nv] += delta
geometry = upper_branch + lower_branch
if args.three_d:
oxide_center = mp.Vector3(z=-0.5 * t_oxide)
oxide_size = mp.Vector3(cell.size.x, cell.size.y, t_oxide)
oxide_layer = [
mp.Block(material=oxide, center=oxide_center, size=oxide_size)
]
geometry = geometry + oxide_layer
sources = [
mp.EigenModeSource(
src=mp.GaussianSource(fcen, fwidth=df),
volume=src_vol,
eig_parity=mp.NO_PARITY if args.three_d else mp.EVEN_Y + mp.ODD_Z)
]
sim = mp.Simulation(resolution=args.res,
cell_size=cell.size,
boundary_layers=[mp.PML(dpml)],
sources=sources,
geometry=geometry)
mode1 = sim.add_mode_monitor(fcen, 0, 1, mp.ModeRegion(volume=p1))
mode2 = sim.add_mode_monitor(fcen, 0, 1, mp.ModeRegion(volume=p2))
mode3 = sim.add_mode_monitor(fcen, 0, 1, mp.ModeRegion(volume=p3))
mode4 = sim.add_mode_monitor(fcen, 0, 1, mp.ModeRegion(volume=p4))
sim.run(until_after_sources=100)
# S parameters
p1_coeff = sim.get_eigenmode_coefficients(
mode1, [1],
eig_parity=mp.NO_PARITY if args.three_d else mp.EVEN_Y +
mp.ODD_Z).alpha[0, 0, 0]
p2_coeff = sim.get_eigenmode_coefficients(
mode2, [1],
eig_parity=mp.NO_PARITY if args.three_d else mp.EVEN_Y +
mp.ODD_Z).alpha[0, 0, 1]
p3_coeff = sim.get_eigenmode_coefficients(
mode3, [1],
eig_parity=mp.NO_PARITY if args.three_d else mp.EVEN_Y +
mp.ODD_Z).alpha[0, 0, 0]
p4_coeff = sim.get_eigenmode_coefficients(
mode4, [1],
eig_parity=mp.NO_PARITY if args.three_d else mp.EVEN_Y +
mp.ODD_Z).alpha[0, 0, 0]
# transmittance
p2_trans = abs(p2_coeff)**2 / abs(p1_coeff)**2
p3_trans = abs(p3_coeff)**2 / abs(p1_coeff)**2
p4_trans = abs(p4_coeff)**2 / abs(p1_coeff)**2
print("trans:, {:.2f}, {:.6f}, {:.6f}, {:.6f}".format(
args.d, p2_trans, p3_trans, p4_trans))
def main(args):
resolution = 20 # pixels/um
eps = 13 # epsilon of waveguide
w = 1.2 # width of the waveguide
dpml = 1 # PML thickness
largC = 16 # largura da celula
altC = 16 # altura da celula
sx = largC + dpml
sy = altC + dpml
fcen = args.fcen # pulse centger frequency
df = args.df # pulse frequency width
cell = mp.Vector3(sx,sy,0)
def epsP(p):
valorIm = -0.5 + math.pow(math.cos((p.y)*(2*math.pi/(altC/4))),2)
return mp.Medium(epsilon=3, D_conductivity=2*math.pi*fcen*(valorIm)/3)
epsP.do_averaging = True
blk = mp.Block(size=mp.Vector3(mp.inf,mp.inf,mp.inf), material=mp.Medium(epsilon=eps))
geometry = [blk]
# AQUI ESTÁ A LINHA DE TESTE: USAMOS A FUNCAO PARA DEFINIR O EPSILON
# geometry.append(mp.Block(size=mp.Vector3(mp.inf,w,mp.inf)))
geometry.append(mp.Block(center=mp.Vector3(),size=mp.Vector3(mp.inf,altC,mp.inf),material=epsP))
pml_layers = [mp.PML(1.0)]
src = [mp.Source(mp.GaussianSource(fcen, fwidth=df),
component=mp.Ey,
center=mp.Vector3(-0.5*sx+dpml), # fonte na esquerda; para colocar na direita usar 0.5*sx - dpml
size=mp.Vector3(0,w))]
sim = mp.Simulation(cell_size=cell,
geometry=geometry,
boundary_layers=pml_layers,
sources=src, #symmetries=sym,
resolution=resolution)
sim.run(mp.at_beginning(mp.output_epsilon),
mp.to_appended("hz",mp.at_every(0.4,mp.output_hfield_z)),
until=300)
epsilon0 = sim.get_array(center=mp.Vector3(), size=cell, component=mp.Dielectric)
plt.figure()
plt.imshow(epsilon0.transpose(), interpolation='spline36', cmap='RdBu')
plt.axis('off')
plt.savefig('epsilon.png',format='png')
plt.show()
decay = meep.Ex
else:
source = lambda sim: meep_ext.y_polarized_plane_wave(sim, src_time)
decay = meep.Ey
### monitor info
particle_monitor_gap = 50 * nm
pml_monitor_gap = 50 * nm
norm_file_ext = 'norm_box'
monitor_size = [
box[0] + 2 * particle_monitor_gap, box[1] + 2 * particle_monitor_gap,
box[2] + 2 * particle_monitor_gap
]
### grid
pml = meep.PML(15 / resolution)
lx = box[0] + 2 * particle_monitor_gap + 2 * pml_monitor_gap + 2 * pml.thickness
ly = box[1] + 2 * particle_monitor_gap + 2 * pml_monitor_gap + 2 * pml.thickness
lz = box[2] + 2 * particle_monitor_gap + 2 * pml_monitor_gap + 2 * pml.thickness
cell = meep.Vector3(lx, ly, lz)
Nx, Ny, Nz = map(round, cell * resolution)
@job.cache
def norm_sim():
"""perform normalization simulation"""
norm = meep.Simulation(cell_size=cell,
boundary_layers=[pml],
geometry=[],
default_material=medium,
resolution=resolution)
cell = mp.Vector3(sx, sy, 0)
blk = mp.Block(size=mp.Vector3(1e20, w, 1e20), material=mp.Medium(epsilon=eps))
geometry = [blk]
for i in range(3):
geometry.append(mp.Cylinder(r, center=mp.Vector3(d / 2 + i)))
for i in range(3):
geometry.append(mp.Cylinder(r, center=mp.Vector3(d / -2 - i)))
sim = mp.Simulation(cell_size=cell,
geometry=geometry,
sources=[],
boundary_layers=[mp.PML(dpml)],
resolution=20)
# add sources
sim.sources = [
mp.Source(mp.GaussianSource(fcen, fwidth=df), mp.Hz, mp.Vector3())
]
# run until sources are finished (and no later)
sim._run_sources_until(0, [])
# get 1D and 2D array slices
xMin = -0.25 * sx
xMax = +0.25 * sx
yMin = -0.15 * sy
yMax = +0.15 * sy
from utils import ApproxComparisonTestCase
MonitorObject = Enum('MonitorObject', 'EIGENMODE DFT')
resolution = 30
silicon = mp.Medium(epsilon=12)
sapphire = mp.Medium(epsilon_diag=(10.225, 10.225, 9.95),
epsilon_offdiag=(-0.825, -0.55 * np.sqrt(3 / 2),
0.55 * np.sqrt(3 / 2)))
sxy = 5.0
cell_size = mp.Vector3(sxy, sxy, 0)
dpml = 1.0
pml_xy = [mp.PML(thickness=dpml)]
pml_x = [mp.PML(thickness=dpml, direction=mp.X)]
eig_parity = mp.EVEN_Y + mp.ODD_Z
design_region_size = mp.Vector3(1.5, 1.5)
design_region_resolution = int(2 * resolution)
Nx, Ny = int(design_region_size.x * design_region_resolution), int(
design_region_size.y * design_region_resolution)
## ensure reproducible results
rng = np.random.RandomState(9861548)
## random design region
p = 0.5 * rng.rand(Nx * Ny)
import matplotlib.pyplot as plt
# In[5]:
n = 3.4
w = 1
r = 1
pad = 4
dpml = 2
sxy = 2*(r+w+pad+dpml)
cell_size = mp.Vector3(sxy,sxy)
pml_layers = [mp.PML(dpml)]
nonpml_vol = mp.Volume(mp.Vector3(), size=mp.Vector3(sxy-2*dpml,sxy-2*dpml))
geometry = [mp.Cylinder(radius=r+w, material=mp.Medium(index=n)),
mp.Cylinder(radius=r)]
fcen = 0.118
src = [mp.Source(mp.ContinuousSource(fcen),
component=mp.Ez,
center=mp.Vector3(r+0.1)),
mp.Source(mp.ContinuousSource(fcen),
component=mp.Ez,
center=mp.Vector3(-(r+0.1)),
amplitude=-1)]
def _load_dump_structure(self, chunk_file=False, chunk_sim=False):
from meep.materials import Al
resolution = 50
cell = mp.Vector3(5, 5)
sources = mp.Source(src=mp.GaussianSource(1, fwidth=0.2),
center=mp.Vector3(),
component=mp.Ez)
one_by_one = mp.Vector3(1, 1, mp.inf)
geometry = [
mp.Block(material=Al, center=mp.Vector3(), size=one_by_one),
mp.Block(material=mp.Medium(epsilon=13),
center=mp.Vector3(1),
size=one_by_one)
]
pml_layers = [mp.PML(0.5)]
symmetries = [mp.Mirror(mp.Y)]
sim1 = mp.Simulation(resolution=resolution,
cell_size=cell,
boundary_layers=pml_layers,
geometry=geometry,
symmetries=symmetries,
sources=[sources])
sample_point = mp.Vector3(0.12, -0.29)
ref_field_points = []
def get_ref_field_point(sim):
p = sim.get_field_point(mp.Ez, sample_point)
ref_field_points.append(p.real)
sim1.run(mp.at_every(5, get_ref_field_point), until=50)
dump_fn = 'test_load_dump_structure.h5'
dump_chunk_fname = None
chunk_layout = None
sim1.dump_structure(dump_fn)
if chunk_file:
dump_chunk_fname = 'test_load_dump_structure_chunks.h5'
sim1.dump_chunk_layout(dump_chunk_fname)
chunk_layout = dump_chunk_fname
if chunk_sim:
chunk_layout = sim1
sim = mp.Simulation(resolution=resolution,
cell_size=cell,
boundary_layers=pml_layers,
sources=[sources],
symmetries=symmetries,
chunk_layout=chunk_layout,
load_structure=dump_fn)
field_points = []
def get_field_point(sim):
p = sim.get_field_point(mp.Ez, sample_point)
field_points.append(p.real)
sim.run(mp.at_every(5, get_field_point), until=50)
for ref_pt, pt in zip(ref_field_points, field_points):
self.assertAlmostEqual(ref_pt, pt)
mp.all_wait()
if mp.am_master():
os.remove(dump_fn)
if dump_chunk_fname:
os.remove(dump_chunk_fname)