Refractive index of S-BSM81 (OHARA)

import lightsmith as ls

# S-BSM81 (OHARA): S-BSM81
ohara_s_bsm81 = ls.fetch_refractiveindex("specs", "OHARA-optical", "S-BSM81", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ohara_s_bsm81.range_nm)  # (290, 2400) nm
eps = ohara_s_bsm81.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_ac73c70251f8/lightsmith"
ohara_s_bsm81 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ohara_s_bsm81.source)  # citation and provenance travel with the data

# ... load ohara_s_bsm81 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ohara_s_bsm81)],
    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

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_ac73c70251f8/lightsmith?model=drude_lorentz"
ohara_s_bsm81_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))