Refractive index of SrTiO₃ (Strontium titanate, STO)

import lightsmith as ls

# SrTiO3 (Strontium titanate, STO): Wöhlecke et al. 1977: Amorphous; n 0.3–1.0 µm
srtio3 = ls.fetch_refractiveindex("main", "SrTiO3", "Wohlecke-a", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(srtio3.range_nm)  # (300, 1000) nm
eps = srtio3.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_607f174c6f4f/lightsmith"
srtio3 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(srtio3.source)  # citation and provenance travel with the data

# ... load srtio3 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=srtio3)],
    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_607f174c6f4f/lightsmith?model=drude_lorentz"
srtio3_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))