Optical constants

Refractive index of WSe₂ (Tungsten diselenide)

Jin et al. 2025: monolayer (1L) film; n,k 30–60 µm

Data: tabulated nk
Range: 29.98–59.96 µm
Points: 1000
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 2.3775
Extinction coefficient k: 0.212172

Permittivity ε₁: 5.60749
Permittivity ε₂: 1.00888

Absorption coefficient α: 628.828 cm⁻¹
Penetration depth δ = λ/(2πk): 31805.2 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.366667 µm⁻¹

Group index n_g: 17.9242
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 0.0292416 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

# WSe2 (Tungsten diselenide): Jin et al. 2025: monolayer (1L) film; n,k 30–60 µm
wse2 = ls.fetch_refractiveindex("main", "WSe2", "Jin", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(wse2.range_nm)  # (29979, 59958) nm
eps = wse2.eps([42400])  # 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_c56b5dc3fdfe/lightsmith"
wse2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(wse2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (wse2/jin-2025).

# ... load wse2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=wse2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=29980, stop_nm=59960, 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

Monolayer WSe₂.

References

X. Jin, V. Aglieri, Y.-G. Jeong, A. Pezeshki, L. Skokan, M. Shagar, Y. Jia, P. Bianucci, A. Ruediger, E. Orgiu, A. Toma, L. Razzari. Enhanced terahertz spectroscopy of a monolayer transition metal dichalcogenide. Adv. Funct. Mater. 35, 2419841 (2025) (Numerical data and calculation script kindly provided by Dr. Xin Jin)
[Calculation script (Python)]

doi:10.1002/adfm.202419841 Enhanced Terahertz Spectroscopy of a Monolayer Transition Metal Dichalcogenide, Advanced Functional Materials (2025)

Cite

Xin Jin et al.. Enhanced Terahertz Spectroscopy of a Monolayer Transition Metal Dichalcogenide. Advanced Functional Materials, 35, 2419841 (2025), doi:10.1002/adfm.202419841; [Calculation script (Python)]; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

1000 rows as published

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

WSe2 (Tungsten diselenide), Jin et al. 2025: monolayer (1L) film; n,k 30–60 µm: n and k versus wavelength
λ (µm)	n	k
29.979	0.60586	0.02127
29.994	0.60468	0.021398
30.009	0.6035	0.021526
30.024	0.6023	0.021657
30.039	0.6011	0.021788
30.054	0.59989	0.021921
30.07	0.59868	0.022055
30.085	0.59746	0.02219
30.1	0.59623	0.022327
30.115	0.59499	0.022465
30.13	0.59374	0.022604
30.145	0.59249	0.022745
30.16	0.59123	0.022888
30.176	0.58996	0.023032
30.191	0.58868	0.023177
30.206	0.5874	0.023324
30.221	0.5861	0.023473
30.237	0.5848	0.023623
30.252	0.58349	0.023775
30.267	0.58218	0.023928
30.282	0.58085	0.024083
30.298	0.57952	0.02424
30.313	0.57817	0.024398
30.328	0.57682	0.024559
30.344	0.57546	0.024721
30.359	0.57409	0.024884
30.375	0.57271	0.02505
30.39	0.57133	0.025218
30.405	0.56993	0.025387
30.421	0.56852	0.025558
30.436	0.56711	0.025732
30.452	0.56568	0.025907
30.467	0.56425	0.026084
30.483	0.56281	0.026264
30.498	0.56135	0.026445
30.514	0.55989	0.026629
30.529	0.55841	0.026815
30.545	0.55693	0.027003
30.56	0.55543	0.027193
30.576	0.55393	0.027385
30.592	0.55241	0.02758
30.607	0.55089	0.027778
30.623	0.54935	0.027977
30.639	0.5478	0.02818
30.654	0.54625	0.028384
30.67	0.54468	0.028592
30.686	0.5431	0.028802
30.701	0.5415	0.029014
30.717	0.5399	0.02923
30.733	0.53828	0.029448
30.749	0.53666	0.029669
30.765	0.53502	0.029892
30.78	0.53336	0.030119
30.796	0.5317	0.030349
30.812	0.53002	0.030582
30.828	0.52833	0.030818
30.844	0.52663	0.031057
30.86	0.52492	0.031299
30.876	0.52319	0.031545
30.891	0.52145	0.031794
30.907	0.51969	0.032047
30.923	0.51792	0.032303
30.939	0.51614	0.032563
30.955	0.51434	0.032827
30.971	0.51253	0.033094
30.987	0.51071	0.033365
31.003	0.50886	0.03364
31.019	0.50701	0.033919
31.036	0.50514	0.034203
31.052	0.50325	0.03449
31.068	0.50135	0.034782
31.084	0.49944	0.035079
31.1	0.4975	0.03538
31.116	0.49556	0.035685
31.132	0.49359	0.035996
31.148	0.49161	0.036311
31.165	0.48961	0.036631
31.181	0.48759	0.036957
31.197	0.48556	0.037287
31.213	0.48351	0.037623
31.23	0.48144	0.037965
31.246	0.47935	0.038312
31.262	0.47725	0.038665
31.279	0.47512	0.039024
31.295	0.47298	0.03939
31.311	0.47081	0.039761
31.328	0.46863	0.040139
31.344	0.46643	0.040524
31.36	0.46421	0.040916
31.377	0.46196	0.041314
31.393	0.4597	0.04172
31.41	0.45741	0.042134
31.426	0.4551	0.042555
31.443	0.45277	0.042984
31.459	0.45042	0.043421
31.476	0.44804	0.043867
31.492	0.44564	0.044321
31.509	0.44322	0.044784
31.526	0.44077	0.045256
31.542	0.4383	0.045738
31.559	0.4358	0.04623
31.575	0.43328	0.046732
31.592	0.43073	0.047244
31.609	0.42815	0.047767
31.625	0.42555	0.048301
31.642	0.42292	0.048847
31.659	0.42026	0.049405
31.676	0.41758	0.049975
31.692	0.41486	0.050558
31.709	0.41211	0.051155
31.726	0.40934	0.051765
31.743	0.40653	0.05239
31.76	0.40369	0.053029
31.776	0.40082	0.053684
31.793	0.39792	0.054355
31.81	0.39499	0.055043
31.827	0.39201	0.055748
31.844	0.38901	0.056471
31.861	0.38597	0.057212
31.878	0.38289	0.057974
31.895	0.37978	0.058756
31.912	0.37662	0.059559
31.929	0.37343	0.060384
31.946	0.3702	0.061233
31.963	0.36693	0.062106
31.98	0.36362	0.063005
31.997	0.36027	0.06393
32.014	0.35687	0.064883
32.031	0.35343	0.065865
32.048	0.34994	0.066878
32.066	0.34641	0.067924
32.083	0.34283	0.069003
32.1	0.33921	0.070117
32.117	0.33553	0.07127
32.134	0.33181	0.072461
32.152	0.32803	0.073695
32.169	0.32421	0.074972
32.186	0.32033	0.076295
32.204	0.3164	0.077668
32.221	0.31241	0.079092
32.238	0.30837	0.080571
32.256	0.30428	0.082108
32.273	0.30012	0.083706
32.29	0.29591	0.08537
32.308	0.29165	0.087103
32.325	0.28732	0.088908
32.343	0.28294	0.090792
32.36	0.2785	0.092758
32.378	0.27401	0.094812
32.395	0.26946	0.09696
32.413	0.26485	0.099206
32.43	0.26019	0.10156
32.448	0.25548	0.10402
32.465	0.25073	0.1066
32.483	0.24593	0.1093
32.501	0.24109	0.11214
32.518	0.23621	0.11511
32.536	0.23131	0.11823
32.554	0.22639	0.1215
32.571	0.22146	0.12493
32.589	0.21652	0.12853
32.607	0.2116	0.13229
32.624	0.20669	0.13622
32.642	0.20182	0.14033
32.66	0.197	0.14461
32.678	0.19224	0.14907
32.696	0.18755	0.1537
32.714	0.18296	0.1585
32.731	0.17847	0.16346
32.749	0.1741	0.16857
32.767	0.16985	0.17382
32.785	0.16575	0.1792
32.803	0.16179	0.18469
32.821	0.15798	0.19029
32.839	0.15433	0.19598
32.857	0.15083	0.20174
32.875	0.1475	0.20756
32.893	0.14432	0.21343
32.911	0.1413	0.21933
32.929	0.13843	0.22526
32.947	0.13571	0.23121
32.966	0.13312	0.23716
32.984	0.13067	0.24311
33.002	0.12835	0.24905
33.02	0.12615	0.25498
33.038	0.12407	0.26088
33.057	0.1221	0.26677
33.075	0.12023	0.27263
33.093	0.11846	0.27846
33.111	0.11678	0.28426
33.13	0.11519	0.29003
33.148	0.11368	0.29577
33.166	0.11224	0.30147
33.185	0.11088	0.30714
33.203	0.10959	0.31277
33.222	0.10836	0.31837
33.24	0.10719	0.32394
33.258	0.10607	0.32947
33.277	0.10502	0.33497
33.295	0.10401	0.34043
33.314	0.10305	0.34586
33.333	0.10213	0.35126
33.351	0.10126	0.35663
33.37	0.10043	0.36197
33.388	0.099641	0.36728
33.407	0.098886	0.37257
33.426	0.098165	0.37782
33.444	0.097478	0.38305
33.463	0.096822	0.38825
33.482	0.096195	0.39343
33.5	0.095598	0.39858
33.519	0.095027	0.40371
33.538	0.094483	0.40882
33.557	0.093963	0.4139
33.575	0.093468	0.41897
33.594	0.092995	0.42401
33.613	0.092543	0.42904
33.632	0.092113	0.43404
33.651	0.091703	0.43903
33.67	0.091312	0.444
33.689	0.090939	0.44896
33.708	0.090585	0.4539
33.727	0.090247	0.45882
33.746	0.089927	0.46373
33.765	0.089622	0.46863
33.784	0.089333	0.47351
33.803	0.089058	0.47839
33.822	0.088798	0.48325
33.841	0.088552	0.4881
33.86	0.08832	0.49293
33.879	0.0881	0.49776
33.898	0.087894	0.50258
33.918	0.087699	0.50739
33.937	0.087517	0.51219
33.956	0.087346	0.51699
33.975	0.087187	0.52178
33.995	0.087039	0.52656
34.014	0.086902	0.53133
34.033	0.086775	0.5361
34.053	0.086658	0.54086
34.072	0.086551	0.54562
34.091	0.086454	0.55038
34.111	0.086367	0.55513
34.13	0.086289	0.55988
34.15	0.08622	0.56462
34.169	0.08616	0.56936
34.189	0.086109	0.5741
34.208	0.086067	0.57884
34.228	0.086033	0.58358
34.247	0.086007	0.58832
34.267	0.08599	0.59305
34.287	0.08598	0.59779
34.306	0.085979	0.60253
34.326	0.085985	0.60726
34.345	0.086	0.612
34.365	0.086021	0.61674
34.385	0.08605	0.62149
34.405	0.086087	0.62623
34.424	0.086131	0.63098
34.444	0.086182	0.63573
34.464	0.08624	0.64049
34.484	0.086306	0.64525
34.504	0.086378	0.65001
34.524	0.086457	0.65478
34.544	0.086544	0.65955
34.563	0.086637	0.66433
34.583	0.086736	0.66911
34.603	0.086843	0.6739
34.623	0.086956	0.6787
34.643	0.087076	0.6835
34.664	0.087203	0.68831
34.684	0.087336	0.69312
34.704	0.087476	0.69795
34.724	0.087622	0.70278
34.744	0.087775	0.70762
34.764	0.087934	0.71247
34.784	0.0881	0.71733
34.804	0.088272	0.7222
34.825	0.088451	0.72708
34.845	0.088636	0.73197
34.865	0.088828	0.73687
34.886	0.089026	0.74178
34.906	0.08923	0.7467
34.926	0.089441	0.75163
34.947	0.089659	0.75658
34.967	0.089883	0.76153
34.987	0.090114	0.7665
35.008	0.090351	0.77149
35.028	0.090594	0.77648
35.049	0.090845	0.78149
35.069	0.091102	0.78651
35.09	0.091365	0.79155
35.111	0.091635	0.7966
35.131	0.091912	0.80167
35.152	0.092196	0.80675
35.172	0.092486	0.81185
35.193	0.092784	0.81697
35.214	0.093088	0.8221
35.234	0.093399	0.82724
35.255	0.093717	0.83241
35.276	0.094042	0.83759
35.297	0.094374	0.84279
35.318	0.094713	0.84801
35.338	0.09506	0.85325
35.359	0.095414	0.8585
35.38	0.095775	0.86378
35.401	0.096143	0.86907
35.422	0.096519	0.87439
35.443	0.096903	0.87973
35.464	0.097294	0.88508
35.485	0.097693	0.89046
35.506	0.098099	0.89587
35.527	0.098514	0.90129
35.548	0.098936	0.90673
35.569	0.099367	0.9122
35.59	0.099806	0.9177
35.611	0.10025	0.92321
35.633	0.10071	0.92875
35.654	0.10117	0.93432
35.675	0.10164	0.93991
35.696	0.10213	0.94553
35.718	0.10262	0.95117
35.739	0.10312	0.95684
35.76	0.10362	0.96254
35.782	0.10414	0.96827
35.803	0.10467	0.97402
35.824	0.1052	0.9798
35.846	0.10575	0.98561
35.867	0.10631	0.99146
35.889	0.10687	0.99733
35.91	0.10745	1.0032
35.932	0.10803	1.0092
35.954	0.10863	1.0151
35.975	0.10924	1.0211
35.997	0.10985	1.0272
36.018	0.11048	1.0332
36.04	0.11112	1.0393
36.062	0.11177	1.0455
36.083	0.11244	1.0516
36.105	0.11311	1.0578
36.127	0.1138	1.0641
36.149	0.1145	1.0703
36.171	0.11521	1.0767
36.192	0.11593	1.083
36.214	0.11667	1.0894
36.236	0.11742	1.0958
36.258	0.11818	1.1023
36.28	0.11896	1.1088
36.302	0.11975	1.1154
36.324	0.12055	1.122
36.346	0.12137	1.1286
36.368	0.1222	1.1353
36.39	0.12305	1.1421
36.412	0.12392	1.1488
36.435	0.1248	1.1557
36.457	0.12569	1.1625
36.479	0.1266	1.1695
36.501	0.12753	1.1764
36.523	0.12848	1.1834
36.546	0.12944	1.1905
36.568	0.13042	1.1976
36.59	0.13142	1.2048
36.613	0.13244	1.212
36.635	0.13348	1.2193
36.658	0.13453	1.2267
36.68	0.13561	1.2341
36.703	0.1367	1.2415
36.725	0.13782	1.249
36.748	0.13896	1.2566
36.77	0.14012	1.2642
36.793	0.1413	1.2719
36.815	0.14251	1.2797
36.838	0.14374	1.2875
36.861	0.14499	1.2954
36.883	0.14627	1.3033
36.906	0.14757	1.3114
36.929	0.1489	1.3194
36.952	0.15025	1.3276
36.974	0.15163	1.3358
36.997	0.15304	1.3441
37.02	0.15448	1.3525
37.043	0.15595	1.361
37.066	0.15745	1.3695
37.089	0.15897	1.3781
37.112	0.16054	1.3868
37.135	0.16213	1.3956
37.158	0.16376	1.4045
37.181	0.16542	1.4134
37.204	0.16711	1.4224
37.227	0.16885	1.4316
37.25	0.17062	1.4408
37.274	0.17243	1.4501
37.297	0.17427	1.4595
37.32	0.17616	1.469
37.343	0.1781	1.4786
37.367	0.18007	1.4883
37.39	0.18209	1.4981
37.413	0.18416	1.508
37.437	0.18627	1.518
37.46	0.18843	1.5281
37.483	0.19064	1.5383
37.507	0.19291	1.5487
37.53	0.19522	1.5592
37.554	0.1976	1.5697
37.577	0.20003	1.5804
37.601	0.20252	1.5913
37.625	0.20507	1.6022
37.648	0.20768	1.6133
37.672	0.21036	1.6245
37.696	0.2131	1.6359
37.719	0.21592	1.6474
37.743	0.21881	1.659
37.767	0.22177	1.6708
37.791	0.22481	1.6828
37.815	0.22793	1.6949
37.839	0.23113	1.7071
37.863	0.23441	1.7195
37.886	0.23779	1.7321
37.91	0.24126	1.7448
37.934	0.24483	1.7578
37.959	0.24849	1.7708
37.983	0.25226	1.7841
38.007	0.25613	1.7976
38.031	0.26012	1.8112
38.055	0.26422	1.8251
38.079	0.26844	1.8391
38.103	0.27279	1.8534
38.128	0.27727	1.8678
38.152	0.28189	1.8825
38.176	0.28664	1.8974
38.201	0.29155	1.9126
38.225	0.2966	1.9279
38.249	0.30182	1.9435
38.274	0.30721	1.9594
38.298	0.31277	1.9755
38.323	0.31852	1.9919
38.347	0.32446	2.0085
38.372	0.33059	2.0254
38.396	0.33694	2.0426
38.421	0.34351	2.0601
38.446	0.3503	2.0779
38.47	0.35734	2.096
38.495	0.36463	2.1144
38.52	0.37218	2.1331
38.545	0.38002	2.1522
38.57	0.38815	2.1716
38.594	0.39658	2.1914
38.619	0.40534	2.2115
38.644	0.41444	2.232
38.669	0.4239	2.2529
38.694	0.43373	2.2742
38.719	0.44397	2.2959
38.744	0.45463	2.318
38.769	0.46573	2.3406
38.794	0.47731	2.3635
38.82	0.48938	2.387
38.845	0.50198	2.4109
38.87	0.51513	2.4352
38.895	0.52888	2.4601
38.92	0.54326	2.4855
38.946	0.5583	2.5114
38.971	0.57405	2.5378
38.996	0.59056	2.5647
39.022	0.60786	2.5922
39.047	0.62602	2.6202
39.073	0.64508	2.6488
39.098	0.66512	2.678
39.124	0.68619	2.7078
39.149	0.70836	2.7382
39.175	0.73171	2.7691
39.201	0.75633	2.8006
39.226	0.78229	2.8328
39.252	0.8097	2.8655
39.278	0.83865	2.8987
39.303	0.86927	2.9325
39.329	0.90166	2.9668
39.355	0.93595	3.0017
39.381	0.97228	3.0369
39.407	1.0108	3.0726
39.433	1.0517	3.1085
39.459	1.095	3.1447
39.485	1.1411	3.181
39.511	1.19	3.2174
39.537	1.242	3.2535
39.563	1.2973	3.2894
39.589	1.356	3.3247
39.615	1.4184	3.3592
39.642	1.4847	3.3926
39.668	1.555	3.4245
39.694	1.6295	3.4546
39.721	1.7085	3.4824
39.747	1.7919	3.5074
39.773	1.8799	3.529
39.8	1.9723	3.5465
39.826	2.0692	3.5593
39.853	2.1703	3.5666
39.879	2.2753	3.5677
39.906	2.3836	3.5618
39.932	2.4947	3.5481
39.959	2.6077	3.5259
39.986	2.7216	3.4947
40.012	2.8353	3.4541
40.039	2.9476	3.4038
40.066	3.057	3.3437
40.093	3.1622	3.2742
40.12	3.2619	3.1958
40.146	3.3548	3.1092
40.173	3.4399	3.0155
40.2	3.5164	2.9159
40.227	3.5836	2.8116
40.254	3.6412	2.7041
40.281	3.6891	2.5947
40.309	3.7276	2.4846
40.336	3.757	2.3751
40.363	3.7779	2.2671
40.39	3.7909	2.1616
40.417	3.7967	2.0591
40.445	3.7961	1.9603
40.472	3.7899	1.8655
40.499	3.7787	1.7749
40.527	3.7634	1.6886
40.554	3.7445	1.6068
40.582	3.7227	1.5294
40.609	3.6984	1.4563
40.637	3.6721	1.3873
40.664	3.6443	1.3223
40.692	3.6153	1.2612
40.72	3.5853	1.2036
40.747	3.5547	1.1495
40.775	3.5237	1.0986
40.803	3.4924	1.0507
40.831	3.4611	1.0057
40.858	3.4298	0.96327
40.886	3.3987	0.92336
40.914	3.3679	0.88578
40.942	3.3373	0.85035
40.97	3.3072	0.81695
40.998	3.2775	0.78542
41.026	3.2482	0.75565
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41.083	3.1913	0.7009
41.111	3.1636	0.67572
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41.167	3.1098	0.62925
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41.741	2.6832	0.34699
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58.782	1.393	0.010394
58.839	1.3924	0.010352
58.897	1.3919	0.010311
58.955	1.3913	0.01027
59.013	1.3907	0.01023
59.072	1.3902	0.010189
59.13	1.3896	0.010149
59.188	1.389	0.010109
59.247	1.3885	0.010069
59.305	1.3879	0.01003
59.364	1.3874	0.0099904
59.423	1.3868	0.0099513
59.482	1.3863	0.0099124
59.541	1.3857	0.0098738
59.601	1.3852	0.0098353
59.66	1.3846	0.0097971
59.719	1.3841	0.0097591
59.779	1.3835	0.0097213
59.839	1.383	0.0096836
59.899	1.3825	0.0096462
59.958	1.3819	0.0096091

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: —

Plot