Visualization of near field¶
MSTM code can be used to calculate the distribution of the near (or local) field.
The field is calculated on a rectangular region, specified by input (nearfield.NearField.set_plane()
).
Currently, only magnititude of electric field \(E^2\) can be visualized.
Example: field distribution near two particles¶
Two silver spheres with radii 5 and 3 nm are placed at 0,0,0 and 0,0,11. Incident beam with wavelength 385 nm is directed by Z axis and have X polzarization.
from mstm_studio.nearfield import NearField
from mstm_studio.mstm_spectrum import ExplicitSpheres
from mstm_studio.alloy_AuAg import AlloyAuAg
mat = AlloyAuAg(x_Au=0.0) # silver material
nf = NearField(wavelength=385) # near the resonance
nf.environment_material = 1.5 # glass matrix
nf.set_plane(plane='xz', hmin=10, hmax=20, vmin=15, vmax=15, step=0.25)
spheres = ExplicitSpheres(2, [0, 0, 0, 5, 0, 0, 11, 3],
mat_filename=2*[mat])
nf.set_spheres(spheres)
nf.simulate()
nf.plot()
Resulting image
Class¶

class
mstm_studio.nearfield.
NearField
(wavelength)[source]¶ Calculate field distribution map at fixed wavelength

plot
(fig=None, axs=None, caxs=None)[source]¶ Show 2D field distribution
Parameters:
 fig:
 matplotlib figure
 axs:
 matplotlib axes
 caxs:
 matplotlib axes for colorbar
 Returns:
 filled/created fig and axs objects
