Optical constants

Refractive index of MoTe₂ (Molybdenum ditelluride)

Beal and Huges 1979: n,k 0.069–1.22 µm

Data: tabulated nk
Range: 0.06911–1.216 µm
Points: 100
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 3.89825
Extinction coefficient k: 1.51925

Permittivity ε₁: 12.8882
Permittivity ε₂: 11.8448

Absorption coefficient α: 324906 cm⁻¹
Penetration depth δ = λ/(2πk): 61.5563 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -1.81034 µm⁻¹

Group index n_g: 4.96201
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

# MoTe2 (Molybdenum ditelluride): Beal and Huges 1979: n,k 0.069–1.22 µm
mote2 = ls.fetch_refractiveindex("main", "MoTe2", "Beal", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(mote2.range_nm)  # (69.11, 1216) nm
eps = mote2.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_fc80d5446b4c/lightsmith"
mote2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(mote2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (mote2/beal-huges-1979).

# ... load mote2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=mote2)],
    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.

References

A. R. Beal and H. P. Huges. Kramers-Kronig analysis of the reflectivity spectra of 2H-MoS₂, 2H-MoSe₂, and 2H-MoTe₂. J. Phys. C 12, 881 (1979)

doi:10.1088/0022-3719/12/5/017 Kramers-Kronig analysis of the reflectivity spectra of 2H-MoS 2 , 2H-MoSe 2 and 2H-MoTe 2, Journal of Physics C: Solid State Physics (1979)

Cite

A R Beal and H P Hughes. Kramers-Kronig analysis of the reflectivity spectra of 2H-MoS 2 , 2H-MoSe 2 and 2H-MoTe 2. Journal of Physics C: Solid State Physics, 12, 881-890 (1979), doi:10.1088/0022-3719/12/5/017; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

100 rows as published

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

MoTe2 (Molybdenum ditelluride), Beal and Huges 1979: n,k 0.069–1.22 µm: n and k versus wavelength
λ (µm)	n	k
0.06911	0.5384	0.5143
0.0807	0.577	0.8162
0.09228	0.6574	1.045
0.1039	0.7485	1.229
0.1155	0.8149	1.415
0.127	1.042	1.591
0.1386	1.423	1.689
0.1502	1.67	1.423
0.1618	1.504	1.115
0.1734	1.312	1.153
0.185	1.132	1.375
0.1966	1.088	1.672
0.2082	1.202	2.015
0.2197	1.382	2.211
0.2313	1.583	2.331
0.2429	1.793	2.341
0.2545	2.002	2.329
0.2661	2.132	2.262
0.2777	2.245	2.181
0.2893	2.276	2.213
0.3008	2.315	2.253
0.3124	2.453	2.361
0.324	2.593	2.409
0.3356	2.705	2.432
0.3472	2.814	2.457
0.3588	3.015	2.35
0.3704	3.097	2.251
0.382	3.114	2.203
0.3935	3.147	2.2
0.4051	3.182	2.198
0.4167	3.241	2.233
0.4283	3.3	2.269
0.4399	3.485	2.189
0.4515	3.567	2.161
0.4631	3.641	2.14
0.4747	3.716	2.121
0.4862	3.792	2.101
0.4978	3.926	2.052
0.5094	4.024	1.968
0.521	4.056	1.868
0.5326	4.051	1.673
0.5442	4.04	1.599
0.5558	3.982	1.543
0.5673	3.936	1.52
0.5789	3.914	1.52
0.5905	3.893	1.519
0.6021	3.877	1.529
0.6137	3.876	1.551
0.6253	3.9	1.563
0.6369	3.924	1.576
0.6485	3.948	1.588
0.66	3.976	1.6
0.6716	4.036	1.611
0.6832	4.095	1.622
0.6948	4.153	1.633
0.7064	4.211	1.644
0.718	4.276	1.638
0.7296	4.36	1.617
0.7412	4.444	1.597
0.7527	4.517	1.553
0.7643	4.558	1.426
0.7759	4.613	1.365
0.7875	4.615	1.32
0.7991	4.617	1.275
0.8107	4.62	1.229
0.8223	4.624	1.184
0.8338	4.609	1.143
0.8454	4.59	1.103
0.857	4.582	1.11
0.8686	4.583	1.156
0.8802	4.668	1.056
0.8918	4.776	0.9488
0.9034	4.783	0.8653
0.915	4.793	0.7936
0.9265	4.782	0.7253
0.9381	4.767	0.6601
0.9497	4.755	0.6114
0.9613	4.743	0.5624
0.9729	4.731	0.5131
0.9845	4.699	0.4655
0.9961	4.659	0.45
1.008	4.618	0.4344
1.019	4.577	0.4185
1.031	4.535	0.4023
1.042	4.494	0.3981
1.054	4.477	0.3995
1.066	4.466	0.4005
1.077	4.454	0.4015
1.089	4.443	0.4026
1.1	4.412	0.4194
1.112	4.381	0.4469
1.124	4.359	0.4739
1.135	4.393	0.4947
1.147	4.427	0.5152
1.158	4.461	0.5354
1.17	4.492	0.5277
1.181	4.517	0.4747
1.193	4.542	0.4222
1.205	4.568	0.3703
1.216	4.595	0.3189

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: —

MoTe₂ (Molybdenum ditelluride): all datasets

Bulk

Beal and Huges 1979: n,k 0.069–1.22 µm n,k 0.06911–1.216 µm default

Multilayer flakes

About MoTe2 (Molybdenum ditelluride)

Molybdenum ditelluride (MoTe₂) is a member of the transition metal dichalcogenides (TMDs) family, characterized by its layered structure. Each layer comprises a plane of molybdenum atoms situated between two planes of tellurium atoms. These layers are bound by weak van der Waals forces, enabling easy exfoliation into individual layers or few-layered structures. Like other TMDs, MoTe₂ undergoes a change in electronic properties when thinned down to a monolayer; it transitions from an indirect to a direct bandgap semiconductor. Due to this unique property and its high electron mobility, MoTe₂ is a material of significant interest in nanoelectronics, optoelectronics, and for potential applications in field-effect transistors, photodetectors, and other advanced electronic devices.

More about MoTe2 (Molybdenum ditelluride) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/MoTe2/nk/Beal.yml
ID: ds_fc80d5446b4c
API: /v1/datasets/ds_fc80d5446b4c

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