GeS₂ (Germanium disulfide)

Glasses, oxides and dielectrics anisotropic

6 datasets, together covering 0.25–2.042 µm. Default: Slavich et al. 1989: n,k(α) 0.250–1.70 µm.

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

Datasets

Experimental data

Ab initio calculations

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# GeS2 (Germanium disulfide): Slavich et al. 1989: n,k(α) 0.250–1.70 µm
ges2 = ls.fetch_refractiveindex("main", "GeS2", "Slavich-α", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ges2.range_nm)  # (250, 1700) nm
eps = ges2.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_88b2a4cf9f8a/lightsmith"
ges2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ges2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (ges2/slavich-1989).

# ... load ges2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ges2)],
    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

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

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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 GeS2 (Germanium disulfide)

Germanium disulfide (GeS₂) is a chalcogenide compound known for its wide infrared transparency and high refractive index. It crystallizes in an orthorhombic structure but is often used in its amorphous (glassy) form. GeS₂-based glasses are key materials in infrared optics, especially in mid-IR applications (2–10 µm), due to their low phonon energy and favorable nonlinear optical properties. These characteristics make GeS₂ a valuable component in optical fibers, lenses, and infrared sensors. It is also studied for its role in photonics, infrared transmitting windows, and as a host material in rare-earth-doped fiber amplifiers.

Other names: Germanium disulfide, Germanium(IV) sulfide

API: /v1/materials/mat_d96c18fb1506 · slug ges2