Refractive index of AgGaSe₂ (Silver gallium selenide, AGSe)

import lightsmith as ls

# AgGaSe2 (Silver gallium selenide, AGSe): Harasaki and Kato 1997: n(o) 0.81–16 µm
aggase2 = ls.fetch_refractiveindex("main", "AgGaSe2", "Harasaki-o", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(aggase2.range_nm)  # (810, 16000) nm
eps = aggase2.eps([3600])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_645c57a279f9/lightsmith"
aggase2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(aggase2.source)  # citation and provenance travel with the data

# ... load aggase2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=aggase2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=810, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength