Refractive index of Nb₂O₅ (Niobium pentoxide)

import lightsmith as ls

# Nb2O5 (Niobium pentoxide): Franta et al. 2024: n,k 0.120–399 µm
nb2o5 = ls.fetch_refractiveindex("main", "Nb2O5", "Franta", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(nb2o5.range_nm)  # (120.051, 399362) nm
eps = nb2o5.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_4b2c6a153eaf/lightsmith"
nb2o5 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(nb2o5.source)  # citation and provenance travel with the data

# ... load nb2o5 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=nb2o5)],
    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