Refractive index of Ag (Silver)

import lightsmith as ls

# Ag (Silver): Choi et al. 2020: n,k 1.23–6.99 µm
ag = ls.fetch_refractiveindex("main", "Ag", "Choi", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ag.range_nm)  # (1231, 6988) nm
eps = ag.eps([2930])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_982e43203f51/lightsmith"
ag = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ag.source)  # citation and provenance travel with the data

# ... load ag as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ag)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=1231, stop_nm=6988, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength