Refractive index of In (Indium)

import lightsmith as ls

# In (Indium): Mathewson and Myers 1971: n,k 0.344–1.77 µm; 140 K
in = ls.fetch_refractiveindex("main", "In", "Mathewson-140K", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(in.range_nm)  # (344.4, 1771.2) nm
eps = in.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_d30931a2cd40/lightsmith"
in = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(in.source)  # citation and provenance travel with the data

# ... load in as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=in)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength