Franckeite

2D materials

1 dataset, together covering 0.444–0.7776 µm. Default: Gant et al. 2017: n,k 0.444–0.778 µm.

Compare datasets

Tick datasets in the list to add them to the plot (up to 12).

Datasets

Gant et al. 2017: n,k 0.444–0.778 µm n,k 0.444–0.7776 µm default

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# Franckeite: Gant et al. 2017: n,k 0.444–0.778 µm
franckeite = ls.fetch_refractiveindex("other", "franckeite", "Gant", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(franckeite.range_nm)  # (443.974, 777.601) nm
eps = franckeite.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_6680999c75a7/lightsmith"
franckeite = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(franckeite.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (franckeite/gant-2017).

# ... load franckeite as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=franckeite)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=444, stop_nm=777, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

Materials guide Open a sphere of it in Studio Quick start Ask the community

Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

About Franckeite

Chemical formula: Pb₅Sn₃Sb₂S₁₄

API: /v1/materials/mat_47dad8e28384 · slug franckeite