Refractive index of Al₂O₃ (Aluminium sesquioxide, Sapphire, Alumina)

import lightsmith as ls

# Al2O3 (Aluminium sesquioxide, Sapphire, Alumina): Rodríguez de Marcos et al. 2025: n,k 3.1e-6–993 µm
al2o3 = ls.fetch_refractiveindex("main", "Al2O3", "Rodriguez_de_Marcos", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(al2o3.range_nm)  # (0.00310152, 993324) nm
eps = al2o3.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_7ec70c4c246d/lightsmith"
al2o3 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(al2o3.source)  # citation and provenance travel with the data

# ... load al2o3 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=al2o3)],
    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