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implemented new filtering system based on a Filter Class. Previously, filtering was made expensive by extreme padding, now this has been fixed by choosing a more appropriate padding size. The gradient chain based on unitcells has been implemented but the results have yet to be tested using FDTD, which will be the next step. Added some utilities to visualize the effect of filter radius on given input masks and added all data concerning unit cell simulations. Still to be done is to fix materials in the MEEP simulations, so as to account for true material behavior instead of relying on constant refractive indices.

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Edoardo Vergerio
2026-10-14 16:40:05 +02:00
parent 7a71b43b72
commit 625cd64f53
34 changed files with 1891 additions and 196 deletions
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unit_cell/unit_cell_plots.py
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import numpy as np
import matplotlib.pyplot as plt
#import the parameter sweep arrays for the central wavelength
diameters = np.load("unit_cell/unit_cell_center_1550_h900nm_res50_wvl_diameters.npy")
print(diameters)
mode_wvl = np.load("unit_cell/unit_cell_center_1550_h900nm_res50_wvl_mode_wvl.npy")
mode_tran_arr = np.load("unit_cell/unit_cell_center_1550_h900nm_res50_wvl_mode_tran.npy")
print(mode_tran_arr)
mode_phase_arr = np.load("unit_cell/unit_cell_center_1550_h900nm_res50_wvl_mode_phase.npy")
print(mode_wvl)
unwrap_mode_phase_arr = np.abs(np.unwrap(mode_phase_arr - mode_phase_arr[0], period=2*np.pi))
#import the reference value array
ref_results = np.loadtxt("unit_cell/results_S21_p700nm_h900nm.txt", skiprows=5,dtype=complex)
R_ref = np.real(ref_results[:,1])
S21_ref = ref_results[:,3]
S21_ref_mag = np.abs(S21_ref)
S21_ref_phase = np.abs(np.unwrap(np.angle(S21_ref) - np.angle(S21_ref[0]), period=2*np.pi))
plt.figure()
plt.subplot(1,2,1)
plt.plot(1e3*diameters/2,mode_tran_arr, '^r-.', label='FDTD')
plt.plot(R_ref,S21_ref_mag, '*k--',label='FEM')
plt.xlabel("Pillar Radius (nm)")
plt.xticks([t for t in np.linspace(1e3*diameters[0]/2, 1e3*diameters[-1]/2, 5)])
plt.gca().set_xticklabels([f"{t:.0f}" for t in np.linspace(1e3*diameters[0]/2, 1e3*diameters[-1]/2, 5)])
plt.ylabel("Transmission")
plt.legend()
plt.subplot(1,2,2)
plt.plot(1e3*diameters/2,unwrap_mode_phase_arr, '^r-.', label='FDTD')
plt.plot(R_ref,S21_ref_phase, '*k--', label='FEM')
plt.xlabel("Pillar Radius (nm)")
plt.xticks([t for t in np.linspace(1e3*diameters[0]/2, 1e3*diameters[-1]/2, 5)])
plt.gca().set_xticklabels([f"{t:.0f}" for t in np.linspace(1e3*diameters[0]/2, 1e3*diameters[-1]/2, 5)])
plt.ylabel("Phase (rad)")
plt.legend()
plt.subplots_adjust(wspace=0.5)
plt.savefig("unit_cell/unit_cell_param_sweep_lineplot.pdf")