Refractive index of Nanoscribe IP-S

import lightsmith as ls

# Nanoscribe IP-S: Mavrona et al. 2023: Uncured; n,k 200–998 µm
nanoscribe_ip_s = ls.fetch_refractiveindex("other", "Nanoscribe_IP-S", "Mavrona-uncured", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(nanoscribe_ip_s.range_nm)  # (199861, 997678) nm
eps = nanoscribe_ip_s.eps([447000])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_5c8cf8a9124e/lightsmith"
nanoscribe_ip_s = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(nanoscribe_ip_s.source)  # citation and provenance travel with the data

# ... load nanoscribe_ip_s as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=nanoscribe_ip_s)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=199900, stop_nm=997700, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength