Refractive index of CuGaS₂ (Copper gallium sulfide)

import lightsmith as ls

# CuGaS2 (Copper gallium sulfide): Boyd et al. 1971: n(o) 0.55–11.5 µm; 120 °C
cugas2 = ls.fetch_refractiveindex("main", "CuGaS2", "Boyd-120-o", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cugas2.range_nm)  # (550, 11500) nm
eps = cugas2.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_7332fda07b80/lightsmith"
cugas2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(cugas2.source)  # citation and provenance travel with the data

# ... load cugas2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=cugas2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=550, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_7332fda07b80/lightsmith?model=drude_lorentz"
cugas2_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))