Optical constants

Refractive index of As₂S₃ (Arsenic trisulfide)

Slavich et al. 2024: Ab initio; n,k(α) 0.299–2.07 µm

Data: tabulated nk
Range: 0.2988–2.071 µm
Points: 80
Optical axis: alpha
State: crystalline
Licence: CC0-1.0

Biaxial crystal, axes: alphabeta gamma

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 2.23114
Extinction coefficient k: 0.00407434

Permittivity ε₁: 4.97798
Permittivity ε₂: 0.0181809

Absorption coefficient α: 871.335 cm⁻¹
Penetration depth δ = λ/(2πk): 22953.3 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.548988 µm⁻¹

Group index n_g: 2.55373
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 2.11001 eV

ε = (n + ik)², α = 4πk/λ, n_g = n − λ dn/dλ, GVD = λ³/(2πc²) d²n/dλ², D = −(λ/c) d²n/dλ². Group-velocity dispersion is given for formula data only.

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# As2S3 (Arsenic trisulfide): Slavich et al. 2024: Ab initio; n,k(α) 0.299–2.07 µm
as2s3 = ls.fetch_refractiveindex("main", "As2S3", "Slavich-abinitio-alpha", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(as2s3.range_nm)  # (298.75, 2071.15) nm
eps = as2s3.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_3f5258eb909f/lightsmith"
as2s3 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(as2s3.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (as2s3/slavich-2024-abinitio-alpha).

# ... load as2s3 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=as2s3)],
    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"]).

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.

Comments and conditions

α-axis. Ab initio calculations.

Conditions

direction: alpha

References

A. S. Slavich, G. A. Ermolaev, M. K. Tatmyshevskiy, A. N. Toksumakov, O. G. Matveeva, D. V. Grudinin, K. V. Voronin, A. Mazitov, K. V. Kravtsov, A. V. Syuy, D. M. Tsymbarenko, M. S. Mironov, S. M. Novikov, I. Kruglov, D. A. Ghazaryan, A. A. Vyshnevyy, A. V. Arsenin, V. S. Volkov, K. S Novoselov. Exploring van der Waals materials with high anisotropy: geometrical and optical approaches. Light Sci. Appl., 13, 68 (2024) (Numerical data kindly provided by Georgy Ermolaev)

doi:10.1038/s41377-024-01407-3 Exploring van der Waals materials with high anisotropy: geometrical and optical approaches, Light: Science & Applications (2024)

Cite

Aleksandr S. Slavich et al.. Exploring van der Waals materials with high anisotropy: geometrical and optical approaches. Light: Science & Applications, 13, 68 (2024), doi:10.1038/s41377-024-01407-3; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

80 rows as published

CSV comma separated TXT tab separated YAML n, k Full database record original YAML All quantities CSV JSON metadata

As2S3 (Arsenic trisulfide), Slavich et al. 2024: Ab initio; n,k(α) 0.299–2.07 µm: n and k versus wavelength
λ (µm)	n	k
0.29875	2.39145	0.56305
0.30191	2.41578	0.54508
0.30514	2.40858	0.53071
0.30844	2.4207	0.53991
0.31182	2.43407	0.51921
0.31527	2.4213	0.51751
0.31882	2.4542	0.54007
0.32244	2.4941	0.50914
0.32614	2.50831	0.46818
0.32995	2.49622	0.43456
0.33384	2.49765	0.4261
0.33784	2.4992	0.39661
0.34194	2.49983	0.36694
0.34613	2.44537	0.32899
0.35043	2.40563	0.38863
0.35485	2.45626	0.43059
0.3594	2.49817	0.41758
0.36405	2.55963	0.39697
0.36884	2.58401	0.30296
0.37376	2.50601	0.24202
0.37882	2.4773	0.30214
0.38402	2.51755	0.30262
0.38937	2.54261	0.284
0.39487	2.56571	0.25702
0.40056	2.59229	0.2125
0.4064	2.59302	0.14877
0.41243	2.57122	0.09249
0.41862	2.5309	0.04652
0.42502	2.48484	0.02682
0.43165	2.44983	0.01951
0.43847	2.42232	0.01567
0.44553	2.39947	0.01323
0.4528	2.37984	0.01149
0.46035	2.36252	0.0102
0.46815	2.34699	0.00918
0.47623	2.33295	0.00834
0.48458	2.32012	0.00765
0.49324	2.3083	0.00706
0.50225	2.29731	0.00655
0.51159	2.28708	0.00612
0.52129	2.27753	0.00573
0.53137	2.26857	0.00538
0.54184	2.26014	0.00507
0.55278	2.25216	0.00477
0.56415	2.24464	0.00452
0.57602	2.2375	0.00429
0.58837	2.23072	0.00406
0.6013	2.2243	0.00387
0.61484	2.21816	0.00367
0.62899	2.21233	0.0035
0.64382	2.20676	0.00333
0.65936	2.20146	0.00318
0.67571	2.19639	0.00303
0.69293	2.19155	0.0029
0.71101	2.18692	0.00277
0.73006	2.1825	0.00266
0.7502	2.17828	0.00252
0.77148	2.17424	0.00241
0.79406	2.17037	0.0023
0.81794	2.16668	0.00222
0.84337	2.16315	0.0021
0.87042	2.15977	0.00201
0.89933	2.15653	0.00192
0.93016	2.15344	0.00183
0.96326	2.15051	0.00174
0.99871	2.1477	0.00168
1.03705	2.14502	0.00159
1.07835	2.14248	0.00152
1.12319	2.14005	0.00145
1.1718	2.13773	0.00136
1.22493	2.13556	0.00129
1.28311	2.13347	0.00122
1.34709	2.13153	0.00115
1.41795	2.12967	0.0011
1.4965	2.12793	0.00103
1.58446	2.12629	0.000964121
1.68318	2.12474	0.000894229
1.79528	2.1233	0.000847737
1.92338	2.12198	0.000777576
2.07115	2.12073	0.00073088

Optical transmission calculator

Free-standing sample in vacuum, normal incidence

Transmittance T: —
Reflectance R: —

Fresnel reflection calculator

R_p: —
R_s: —
R = (R_p+R_s)/2: —
Phase φ_p: —
Phase φ_s: —
Brewster angle θ_B: —
Critical angle θ_C: —

As₂S₃ (Arsenic trisulfide): all datasets

Experimental data - crystal

Experimental data - glass

Rodney et al. 1958: n 0.57–11.8 µm n 0.57–11.8 µm

Models and simulations - crystal

About As2S3 (Arsenic trisulfide)

As₂S₃, also known as arsenic trisulfide, exists in both crystalline and amorphous forms. The crystalline form is commonly referred to as orpiment and occurs naturally as a mineral. However, in optical and photonic applications, the amorphous or glassy form of As₂S₃ is often preferred. This chalcogenide glass features a broad transmission window that extends from the visible to the mid-infrared spectral regions, and it is known for its high nonlinear optical coefficients. The amorphous structure allows for the material to be easily molded, drawn into fibers, or deposited as thin films, making it highly versatile for a variety of optoelectronic applications. It also offers the advantage of strong light confinement due to its high refractive index. However, users should exercise caution as the material contains toxic arsenic, and its photosensitive nature necessitates consideration for stability under light exposure. Whether in its crystalline or amorphous state, As₂S₃ remains a material of significant interest for both its unique optical properties and its potential in emerging technologies. Mineral: Orpiment

More about As2S3 (Arsenic trisulfide) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/As2S3/nk/Slavich-abinitio-alpha.yml
ID: ds_3f5258eb909f
API: /v1/datasets/ds_3f5258eb909f

Plot