<reponame>johnaparker/MiePy<gh_stars>1-10
import numpy as np
import matplotlib.pyplot as plt
import miepy

nm = 1e-9
r = 20*nm

fig,axes = plt.subplots(ncols=2, figsize=plt.figaspect(1/2))

Nx = 50
Ny = 50
x = np.linspace(-5*r, 5*r, Nx)
y = np.linspace(-5*r, 5*r, Ny)
z = np.array([0])
X,Y,Z = np.meshgrid(x,y,z, indexing='xy') 
R = (X**2 + Y**2 + Z**2)**0.5
THETA = np.arccos(Z/R)
PHI = np.arctan2(Y,X)

system = miepy.gmt(miepy.spheres([0,0,0], r, miepy.constant_material(1.3)), 
            miepy.sources.plane_wave.from_string(polarization='x'),
            600*nm, 2, interactions=False)

E = np.squeeze(system.E_field(X,Y,Z,False))
I = np.sum(np.abs(E)**2, axis=0)
print(E[:,0,0])

mask = np.zeros((Nx,Ny), dtype=bool)
mask[(np.squeeze(Y))**2 + np.squeeze(X)**2 < 3.5*r**2] = True
I[mask] = 0

im = axes[0].pcolormesh(np.squeeze(X)/nm,np.squeeze(Y)/nm,I, shading='gouraud', rasterized=True)
arrow = E[...]
arrow[0][mask] = 0
arrow[1][mask] = 0
skip = 2
axes[0].quiver(np.squeeze(X)[::skip,::skip]/nm, np.squeeze(Y)[::skip,::skip]/nm, np.real(arrow[0])[::skip,::skip], np.real(arrow[1])[::skip,::skip], pivot='mid')
plt.colorbar(im, ax=axes[0], label='Intensity')
axes[0].set(aspect='equal', xlabel='x (nm)', ylabel='y (nm)')

system = miepy.single_mie_sphere(r, miepy.constant_material(1.3), 600*nm, 2)

E = np.squeeze(system.E_field(index=0)(R,THETA,PHI))

E_cart = np.array([E[0]*np.sin(THETA.squeeze())*np.cos(PHI.squeeze()) + E[1]*np.cos(THETA.squeeze())*np.cos(PHI.squeeze()) - E[2]*np.sin(PHI.squeeze()),
                   E[0]*np.sin(THETA.squeeze())*np.sin(PHI.squeeze()) + E[1]*np.cos(THETA.squeeze())*np.sin(PHI.squeeze()) + E[2]*np.cos(PHI.squeeze()),
                   E[0]*np.cos(THETA.squeeze()) - E[1]*np.sin(THETA.squeeze())])
E = E_cart
# E[0] += 1

I = np.sum(np.abs(E)**2, axis=0)
print(E[:,0,0])
I[mask] = 0

im2 = axes[1].pcolormesh(np.squeeze(X)/nm,np.squeeze(Y)/nm,I, shading='gouraud', rasterized=True)
arrow = E[...]
arrow[0][mask] = 0
arrow[1][mask] = 0
axes[1].quiver(np.squeeze(X)[::skip,::skip]/nm, np.squeeze(Y)[::skip,::skip]/nm, np.real(arrow[0])[::skip,::skip], np.real(arrow[1])[::skip,::skip], pivot='mid')
plt.colorbar(im2, ax=axes[1], label='Intensity')
axes[1].set(aspect='equal', xlabel='x (nm)', ylabel='y (nm)')

plt.show()

import numpy as np
import matplotlib.pyplot as plt
import miepy

nm = 1e-9
r = 20*nm

fig,axes = plt.subplots(ncols=2, figsize=plt.figaspect(1/2))

Nx = 50
Ny = 50
x = np.linspace(-5*r, 5*r, Nx)
y = np.linspace(-5*r, 5*r, Ny)
z = np.array([0])
X,Y,Z = np.meshgrid(x,y,z, indexing='xy') 
R = (X**2 + Y**2 + Z**2)**0.5
THETA = np.arccos(Z/R)
PHI = np.arctan2(Y,X)

system = miepy.gmt(miepy.spheres([0,0,0], r, miepy.constant_material(1.3)), 
            miepy.sources.plane_wave.from_string(polarization='x'),
            600*nm, 2, interactions=False)

E = np.squeeze(system.E_field(X,Y,Z,False))
I = np.sum(np.abs(E)**2, axis=0)
print(E[:,0,0])

mask = np.zeros((Nx,Ny), dtype=bool)
mask[(np.squeeze(Y))**2 + np.squeeze(X)**2 < 3.5*r**2] = True
I[mask] = 0

im = axes[0].pcolormesh(np.squeeze(X)/nm,np.squeeze(Y)/nm,I, shading='gouraud', rasterized=True)
arrow = E[...]
arrow[0][mask] = 0
arrow[1][mask] = 0
skip = 2
axes[0].quiver(np.squeeze(X)[::skip,::skip]/nm, np.squeeze(Y)[::skip,::skip]/nm, np.real(arrow[0])[::skip,::skip], np.real(arrow[1])[::skip,::skip], pivot='mid')
plt.colorbar(im, ax=axes[0], label='Intensity')
axes[0].set(aspect='equal', xlabel='x (nm)', ylabel='y (nm)')

system = miepy.single_mie_sphere(r, miepy.constant_material(1.3), 600*nm, 2)

E = np.squeeze(system.E_field(index=0)(R,THETA,PHI))

E_cart = np.array([E[0]*np.sin(THETA.squeeze())*np.cos(PHI.squeeze()) + E[1]*np.cos(THETA.squeeze())*np.cos(PHI.squeeze()) - E[2]*np.sin(PHI.squeeze()),
                   E[0]*np.sin(THETA.squeeze())*np.sin(PHI.squeeze()) + E[1]*np.cos(THETA.squeeze())*np.sin(PHI.squeeze()) + E[2]*np.cos(PHI.squeeze()),
                   E[0]*np.cos(THETA.squeeze()) - E[1]*np.sin(THETA.squeeze())])
E = E_cart
# E[0] += 1

I = np.sum(np.abs(E)**2, axis=0)
print(E[:,0,0])
I[mask] = 0

im2 = axes[1].pcolormesh(np.squeeze(X)/nm,np.squeeze(Y)/nm,I, shading='gouraud', rasterized=True)
arrow = E[...]
arrow[0][mask] = 0
arrow[1][mask] = 0
axes[1].quiver(np.squeeze(X)[::skip,::skip]/nm, np.squeeze(Y)[::skip,::skip]/nm, np.real(arrow[0])[::skip,::skip], np.real(arrow[1])[::skip,::skip], pivot='mid')
plt.colorbar(im2, ax=axes[1], label='Intensity')
axes[1].set(aspect='equal', xlabel='x (nm)', ylabel='y (nm)')

plt.show()
# E[0] += 1