Tl₃AsSe₃ (Thallium arsenic selenide, TAS)

Glasses, oxides and dielectrics anisotropic

2 datasets, together covering 2–12 µm. Default: Ewbank et al. 1980: n(o) 2–12 µm.

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Datasets

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# Tl3AsSe3 (Thallium arsenic selenide, TAS): Ewbank et al. 1980: n(o) 2–12 µm
tl3asse3 = ls.fetch_refractiveindex("main", "Tl3AsSe3", "Ewbank-o", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(tl3asse3.range_nm)  # (2000, 12000) nm
eps = tl3asse3.eps([4900])  # 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_e5db1fab690a/lightsmith"
tl3asse3 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(tl3asse3.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (tl3asse3/ewbank-1980-o).

# ... load tl3asse3 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=tl3asse3)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=2000, stop_nm=12000, 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"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_e5db1fab690a/lightsmith?model=drude_lorentz"
tl3asse3_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))

A dispersive Drude–Lorentz model for time-domain solvers.

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 Tl3AsSe3 (Thallium arsenic selenide, TAS)

Thallium arsenic selenide (Tl₃AsSe₃, often referred to as TAS) is a mixed crystal compound known for its nonlinear optical properties and high electro-optic coefficients. Its large transparency range, spanning the mid-infrared spectrum, makes it a valuable material for infrared detectors, parametric oscillators, and other optoelectronic devices. TAS is especially useful in applications that require fast response times due to its high-speed electro-optic effect. However, handling and processing TAS should be approached with caution, as both thallium and arsenic are highly toxic.

Other names: Thallium arsenic selenide, TAS, Thallium arsenic selenide, TAS

API: /v1/materials/mat_e52b07a49d9a · slug tl3asse3