def force_gmmt():
wavelengths = np.linspace(400 * nm, 1000 * nm, 100)
eps = meep_ext.get_eps(material)(wavelengths)
Au = miepy.data_material(wavelengths, eps)
# Au = miepy.constant_material(3.5**2)
# Au = miepy.materials.Au()
particles = []
for i in range(9):
orientation = miepy.quaternion.from_spherical_coords(theta[i], phi[i])
particles.append(
miepy.cylinder(position=[x[i], y[i], z[i]],
radius=radius,
height=height,
material=Au,
orientation=orientation))
F = np.zeros([3, 9, len(wavelengths)], dtype=float)
for i, wavelength in enumerate(pbar(wavelengths)):
sol = miepy.cluster(particles=particles,
source=miepy.sources.plane_wave([1, 0]),
wavelength=wavelength,
lmax=4)
F[..., i] = sol.force()
# if i == 0:
# miepy.visualize(sol)
return dict(wavelengths=wavelengths, force=F)
def vis():
fig, ax = plt.subplots()
norm = job.load(norm_sim)
scat = job.load(scat_sim)
ax.plot((1 / nm) / norm.frequency,
scat.scattering / norm.incident * norm.area,
'o',
color='C0',
label='scattering (FDTD)')
ax.plot((1 / nm) / norm.frequency,
scat.absorption / norm.incident * norm.area,
'o',
color='C1',
label='absorption (FDTD)')
ax.plot((1 / nm) / norm.frequency,
(scat.scattering + scat.absorption) / norm.incident * norm.area,
'o',
color='C2',
label='extinction (FDTD)')
wavelengths = np.linspace(400 * nm, 1000 * nm, 100)
eps = meep_ext.get_eps(material)(wavelengths)
Au = miepy.data_material(wavelengths, eps)
# Au = miepy.constant_material(3.5**2)
C, A, E = [np.zeros_like(wavelengths) for i in range(3)]
particles = []
for i in range(9):
orientation = miepy.quaternion.from_spherical_coords(theta[i], phi[i])
particles.append(
miepy.cylinder(position=[x[i], y[i], z[i]],
radius=radius,
height=height,
material=Au,
orientation=orientation))
for i, wavelength in enumerate(pbar(wavelengths)):
sol = miepy.cluster(particles=particles,
source=miepy.sources.plane_wave([1, 0]),
wavelength=wavelength,
lmax=3)
C[i], A[i], E[i] = sol.cross_sections()
ax.axhline(0, linestyle='--', color='black')
ax.plot(wavelengths / nm, C, color='C0', label='scattering (GMT)')
ax.plot(wavelengths / nm, A, color='C1', label='absorption (GMT)')
ax.plot(wavelengths / nm, E, color='C2', label='extinction (GMT)')
ax.legend()
ax.set(xlabel='wavelength (nm)', ylabel='cross-section')
plt.show()
def gmt_sim():
wavelengths = np.linspace(400 * nm, 1000 * nm, 100)
eps = meep_ext.get_eps(material)(wavelengths)
Au = miepy.data_material(wavelengths, eps)
Au = miepy.constant_material(3.5**2)
C, A, E = [np.zeros_like(wavelengths) for i in range(3)]
particles = []
# orientation = miepy.quaternion.from_spherical_coords(theta[i], phi[i])
particles.append(miepy.cube([0, 0, 0], W, material=Au, orientation=q))
for i, wavelength in enumerate(tqdm(wavelengths)):
sol = miepy.cluster(particles=particles,
source=miepy.sources.plane_wave([1, 0]),
wavelength=wavelength,
lmax=4)
C[i], A[i], E[i] = sol.cross_sections()
return dict(wavelengths=wavelengths, C=C, A=A, E=E)
def load_material(name, author):
"""Load a material from the database
name material name
author author of the experimental data
"""
# return load_material(miepy.__path__[0] + "/materials/ag.npy")
filepath = get_filepath(name, author)
with open(filepath, 'r') as f:
docs = yaml.load(f, Loader=yaml.SafeLoader)
str_data = docs['DATA'][0]['data']
list_data = str_data.splitlines()
for i, item in enumerate(list_data):
vals = item.split(' ')
vals = list(map(float, vals))
list_data[i] = vals
data = np.array(list_data)
wav = data[:, 0] * 1e-6
n = data[:, 1]
k = data[:, 2]
eps = (n + 1j * k)**2
return miepy.data_material(wav, eps, name=name)
-31.70601405 + 2.53195081j,
-33.12162576 + 2.52289615j,
-34.56183069 + 2.51650543j,
-36.02659057 + 2.51269917j,
-37.51587153 + 2.51140537j,
-39.02964358 + 2.51255884j,
-40.56788003 + 2.51610058j,
-42.13055709 + 2.52197726j,
])
wavelengths = np.linspace(400 * nm, 1000 * nm, 40)
frequency = np.linspace(1, 1 / 0.4, 40)
separation = 400 * nm
radius = 75 * nm
Au = miepy.data_material(wavelengths, eps)
source = miepy.sources.plane_wave.from_string(polarization='rhc')
gmtF = np.zeros((3, ) + wavelengths.shape)
gmtC = np.zeros((3, ) + wavelengths.shape)
for i, wavelength in enumerate(wavelengths):
sol = miepy.sphere_cluster(position=[[-separation / 2, 0, 0],
[separation / 2, 0, 0]],
radius=radius,
material=Au,
source=source,
wavelength=wavelength,
lmax=2)
gmtF[:, i] = sol.force_on_particle(1)
gmtC[:, i] = sol.cross_sections()
def vis():
### forces
fig, ax = plt.subplots()
norm = job.load(dimer_norm)
scat = job.load(dimer_scat)
ax.plot((1 / nm) / norm.frequency,
scat.scattering / norm.incident * norm.area,
'o',
color='C0',
label='scattering (FDTD)')
ax.plot((1 / nm) / norm.frequency,
scat.absorption / norm.incident * norm.area,
'o',
color='C1',
label='absorption (FDTD)')
ax.plot((1 / nm) / norm.frequency,
(scat.scattering + scat.absorption) / norm.incident * norm.area,
'o',
color='C2',
label='extinction (FDTD)')
import miepy
wavelengths = np.linspace(400 * nm, 1000 * nm, 100)
eps = meep_ext.get_eps(gold)(wavelengths)
Au = miepy.data_material(wavelengths, eps)
# Au = miepy.constant_material(3.5**2)
spheres = miepy.spheres([[-sep / 2, 0, 0], [sep / 2, 0, 0]], radius, Au)
source = miepy.sources.x_polarized_plane_wave()
sol = miepy.gmt(spheres, source, wavelengths, 2)
C, A, E = sol.cross_sections()
ax.axhline(0, linestyle='--', color='black')
ax.plot(wavelengths / nm, C, color='C0', label='scattering (GMT)')
ax.plot(wavelengths / nm, A, color='C1', label='absorption (GMT)')
ax.plot(wavelengths / nm, E, color='C2', label='extinction (GMT)')
ax.legend()
ax.set(xlabel='wavelength (nm)', ylabel='cross-section')
### field animation
fig, ax = plt.subplots()
x = np.linspace(0, cell[0] / nm, Nx)
z = np.linspace(0, cell[1] / nm, Nz)
X, Z = np.meshgrid(x, z, indexing='ij')
var = job.load(dimer_fields)
idx = np.s_[10:-10, 10:-10]
E = var.E[:, 10:-10, 10:-10]
# E = var.E
vmax = np.max(np.abs(E)) / 2
im = ax.pcolormesh(X[idx],
Z[idx],
E[0],
cmap='RdBu',
animated=True,
vmax=vmax,
vmin=-vmax)
ax.set_aspect('equal')
def update(i):
im.set_array(np.ravel(E[i][:-1, :-1]))
return [im]
ani = animation.FuncAnimation(fig,
update,
range(E.shape[0]),
interval=50,
blit=True)
plt.show()
def vis():
### forces
fig, axes = plt.subplots(nrows=2,
figsize=(7, 6),
sharex=True,
gridspec_kw=dict(height_ratios=[2, 1],
hspace=0.05))
norm = job.load(dimer_norm)
scat = job.load(dimer_scat)
for ax in axes:
ax.plot((1 / nm) / norm.frequency,
scat.Fx / norm.incident * norm.area * constants.epsilon_0 / 2 *
1e25,
'o',
color='C0',
label='Fx (FDTD)')
ax.plot((1 / nm) / norm.frequency,
scat.Fy / norm.incident * norm.area * constants.epsilon_0 / 2 *
1e25,
'o',
color='C1',
label='Fy (FDTD)')
ax.plot((1 / nm) / norm.frequency,
scat.Fz / norm.incident * norm.area * constants.epsilon_0 / 2 *
1e25,
'o',
color='C2',
label='Fz (FDTD)')
import miepy
wavelengths = np.linspace(400 * nm, 1000 * nm, 100)
eps = meep_ext.get_eps(gold)(wavelengths)
Au = miepy.data_material(wavelengths, eps)
# Au = miepy.constant_material(3.5**2)
spheres = miepy.spheres([[-sep / 2, 0, 0], [sep / 2, 0, 0]], radius, Au)
source = miepy.sources.rhc_polarized_plane_wave()
sol = miepy.gmt(spheres, source, wavelengths, 2)
F = sol.force_on_particle(1)
for ax in axes:
ax.axhline(0, linestyle='--', color='black')
ax.plot(wavelengths / nm, F[0] * 1e25, color='C0', label='Fx (GMT)')
ax.plot(wavelengths / nm, F[1] * 1e25, color='C1', label='Fy (GMT)')
ax.plot(wavelengths / nm, F[2] * 1e25, color='C2', label='Fz (GMT)')
axes[0].legend()
axes[0].set(ylabel='force')
axes[1].set(xlabel='wavelength (nm)', ylabel='force', ylim=[-0.035, 0.01])
### field animation
fig, ax = plt.subplots()
x = np.linspace(0, cell[0] / nm, Nx)
z = np.linspace(0, cell[1] / nm, Nz)
X, Z = np.meshgrid(x, z, indexing='ij')
var = job.load(dimer_fields)
idx = np.s_[10:-10, 10:-10]
E = var.E[:, 10:-10, 10:-10]
# E = var.E
vmax = np.max(np.abs(E)) / 2
im = ax.pcolormesh(X[idx],
Z[idx],
E[0],
cmap='RdBu',
animated=True,
vmax=vmax,
vmin=-vmax)
ax.set_aspect('equal')
def update(i):
im.set_array(np.ravel(E[i][:-1, :-1]))
return [im]
ani = animation.FuncAnimation(fig,
update,
range(E.shape[0]),
interval=50,
blit=True)
plt.show()
