Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.59023
Extinction coefficient k: 0

Permittivity ε₁: 2.52883
Permittivity ε₂: 0

Absorption coefficient α: 0 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: 34.817
Chromatic dispersion dn/dλ: -0.0864632 µm⁻¹

Group index n_g: 1.64103
Group velocity dispersion: 168.373 fs²/mm

Dispersion parameter D: -918.563 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

# Microchem SU-8 2000: Spec sheet: n 0.32–0.80 µm
mat = ls.fetch_refractiveindex("other", "Microchem_SU8_2000", "specs", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(mat.range_nm)  # (320, 800) nm
eps = mat.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_16271ee7ed0e/lightsmith"
mat = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(mat.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (microchem-su8-2000/specs).

# ... load mat as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=mat)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=800, 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.

Dispersion formula

Cauchy (formula 5), λ in µm

n = 1.566 + 0.00796 λ^{- 2.0} + 0.00014 λ^{- 4.0}

Valid from 0.32 to 0.8 µm.

Coefficients as stored

C_i	Value
C1	1.566
C2	0.00796
C3	-2.0
C4	0.00014
C5	-4.0

Comments and conditions

Microchem SU-8 2000 permanent epoxy negative photoresist. Uncured.

References

Microchem SU-8 2000 Data Sheet, 2011

Cite

Microchem SU-8 2000 Data Sheet, 2011; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 400 wavelengths, the same grid as the API and the library

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

Microchem SU-8 2000, Spec sheet: n 0.32–0.80 µm: n and k versus wavelength
λ (µm)	n
0.32	1.657086
0.320736	1.656608
0.321473	1.656132
0.322212	1.655659
0.322953	1.655189
0.323696	1.654722
0.32444	1.654257
0.325186	1.653795
0.325933	1.653335
0.326683	1.652879
0.327434	1.652424
0.328187	1.651973
0.328941	1.651524
0.329697	1.651077
0.330455	1.650634
0.331215	1.650192
0.331977	1.649753
0.33274	1.649317
0.333505	1.648883
0.334272	1.648452
0.33504	1.648023
0.33581	1.647596
0.336583	1.647172
0.337356	1.64675
0.338132	1.646331
0.338909	1.645914
0.339689	1.645499
0.34047	1.645087
0.341252	1.644677
0.342037	1.64427
0.342823	1.643864
0.343611	1.643461
0.344401	1.64306
0.345193	1.642662
0.345987	1.642266
0.346782	1.641872
0.34758	1.64148
0.348379	1.64109
0.34918	1.640703
0.349983	1.640317
0.350787	1.639934
0.351594	1.639553
0.352402	1.639174
0.353212	1.638798
0.354024	1.638423
0.354838	1.638051
0.355654	1.63768
0.356472	1.637312
0.357291	1.636945
0.358113	1.636581
0.358936	1.636219
0.359761	1.635859
0.360588	1.6355
0.361417	1.635144
0.362248	1.63479
0.363081	1.634438
0.363916	1.634087
0.364753	1.633739
0.365591	1.633392
0.366432	1.633048
0.367274	1.632705
0.368119	1.632364
0.368965	1.632025
0.369813	1.631688
0.370664	1.631353
0.371516	1.63102
0.37237	1.630689
0.373226	1.630359
0.374084	1.630031
0.374944	1.629705
0.375806	1.629381
0.37667	1.629058
0.377536	1.628738
0.378404	1.628419
0.379274	1.628102
0.380146	1.627786
0.38102	1.627472
0.381896	1.62716
0.382774	1.62685
0.383654	1.626542
0.384536	1.626235
0.38542	1.625929
0.386307	1.625626
0.387195	1.625324
0.388085	1.625024
0.388977	1.624725
0.389872	1.624428
0.390768	1.624133
0.391666	1.623839
0.392567	1.623547
0.393469	1.623256
0.394374	1.622967
0.395281	1.62268
0.396189	1.622394
0.3971	1.622109
0.398013	1.621827
0.398928	1.621545
0.399846	1.621266
0.400765	1.620987
0.401686	1.620711
0.40261	1.620435
0.403535	1.620162
0.404463	1.619889
0.405393	1.619619
0.406325	1.619349
0.407259	1.619081
0.408196	1.618815
0.409134	1.61855
0.410075	1.618286
0.411018	1.618024
0.411963	1.617763
0.41291	1.617504
0.413859	1.617246
0.414811	1.616989
0.415764	1.616734
0.41672	1.61648
0.417678	1.616228
0.418638	1.615977
0.419601	1.615727
0.420566	1.615478
0.421533	1.615231
0.422502	1.614985
0.423473	1.614741
0.424447	1.614498
0.425423	1.614256
0.426401	1.614015
0.427381	1.613776
0.428364	1.613538
0.429348	1.613301
0.430336	1.613065
0.431325	1.612831
0.432317	1.612598
0.433311	1.612366
0.434307	1.612136
0.435305	1.611906
0.436306	1.611678
0.437309	1.611451
0.438315	1.611225
0.439322	1.611001
0.440332	1.610778
0.441345	1.610555
0.44236	1.610334
0.443377	1.610115
0.444396	1.609896
0.445418	1.609678
0.446442	1.609462
0.447468	1.609247
0.448497	1.609033
0.449528	1.60882
0.450562	1.608608
0.451597	1.608397
0.452636	1.608187
0.453676	1.607979
0.454719	1.607771
0.455765	1.607565
0.456813	1.60736
0.457863	1.607156
0.458916	1.606953
0.459971	1.60675
0.461028	1.606549
0.462088	1.60635
0.463151	1.606151
0.464215	1.605953
0.465283	1.605756
0.466352	1.60556
0.467425	1.605365
0.468499	1.605172
0.469576	1.604979
0.470656	1.604787
0.471738	1.604596
0.472823	1.604407
0.47391	1.604218
0.474999	1.60403
0.476091	1.603843
0.477186	1.603657
0.478283	1.603472
0.479383	1.603289
0.480485	1.603106
0.48159	1.602924
0.482697	1.602743
0.483807	1.602562
0.484919	1.602383
0.486034	1.602205
0.487151	1.602028
0.488271	1.601851
0.489394	1.601676
0.490519	1.601501
0.491647	1.601327
0.492777	1.601154
0.49391	1.600983
0.495046	1.600812
0.496184	1.600641
0.497325	1.600472
0.498468	1.600304
0.499614	1.600136
0.500763	1.599969
0.501914	1.599804
0.503068	1.599639
0.504225	1.599475
0.505384	1.599311
0.506546	1.599149
0.50771	1.598987
0.508878	1.598826
0.510048	1.598667
0.51122	1.598507
0.512396	1.598349
0.513574	1.598192
0.514754	1.598035
0.515938	1.597879
0.517124	1.597724
0.518313	1.59757
0.519505	1.597416
0.520699	1.597263
0.521896	1.597111
0.523096	1.59696
0.524299	1.59681
0.525504	1.59666
0.526712	1.596511
0.527923	1.596363
0.529137	1.596216
0.530354	1.596069
0.531573	1.595923
0.532795	1.595778
0.53402	1.595634
0.535248	1.59549
0.536478	1.595347
0.537712	1.595205
0.538948	1.595064
0.540187	1.594923
0.541429	1.594783
0.542674	1.594644
0.543922	1.594505
0.545172	1.594367
0.546426	1.59423
0.547682	1.594093
0.548941	1.593957
0.550203	1.593822
0.551468	1.593688
0.552736	1.593554
0.554007	1.593421
0.55528	1.593289
0.556557	1.593157
0.557837	1.593026
0.559119	1.592895
0.560405	1.592765
0.561693	1.592636
0.562985	1.592508
0.564279	1.59238
0.565576	1.592253
0.566877	1.592126
0.56818	1.592
0.569486	1.591875
0.570795	1.59175
0.572108	1.591626
0.573423	1.591503
0.574741	1.59138
0.576063	1.591258
0.577387	1.591137
0.578715	1.591016
0.580045	1.590895
0.581379	1.590776
0.582716	1.590657
0.584055	1.590538
0.585398	1.59042
0.586744	1.590303
0.588093	1.590186
0.589445	1.59007
0.5908	1.589954
0.592159	1.589839
0.59352	1.589725
0.594885	1.589611
0.596252	1.589498
0.597623	1.589385
0.598997	1.589273
0.600374	1.589161
0.601755	1.58905
0.603138	1.58894
0.604525	1.58883
0.605915	1.58872
0.607308	1.588611
0.608704	1.588503
0.610103	1.588395
0.611506	1.588288
0.612912	1.588181
0.614321	1.588075
0.615734	1.58797
0.617149	1.587864
0.618568	1.58776
0.61999	1.587656
0.621416	1.587552
0.622844	1.587449
0.624276	1.587347
0.625712	1.587245
0.62715	1.587143
0.628592	1.587042
0.630037	1.586942
0.631486	1.586842
0.632938	1.586742
0.634393	1.586643
0.635851	1.586544
0.637313	1.586446
0.638779	1.586349
0.640247	1.586252
0.641719	1.586155
0.643195	1.586059
0.644673	1.585963
0.646156	1.585868
0.647641	1.585774
0.64913	1.585679
0.650623	1.585585
0.652118	1.585492
0.653618	1.585399
0.65512	1.585307
0.656627	1.585215
0.658136	1.585124
0.659649	1.585032
0.661166	1.584942
0.662686	1.584852
0.66421	1.584762
0.665737	1.584673
0.667267	1.584584
0.668801	1.584496
0.670339	1.584408
0.67188	1.58432
0.673425	1.584233
0.674973	1.584146
0.676525	1.58406
0.678081	1.583974
0.679639	1.583889
0.681202	1.583804
0.682768	1.583719
0.684338	1.583635
0.685911	1.583552
0.687488	1.583468
0.689069	1.583385
0.690653	1.583303
0.692241	1.583221
0.693833	1.583139
0.695428	1.583058
0.697027	1.582977
0.698629	1.582896
0.700235	1.582816
0.701845	1.582737
0.703459	1.582657
0.705076	1.582578
0.706697	1.5825
0.708322	1.582422
0.709951	1.582344
0.711583	1.582266
0.713219	1.582189
0.714859	1.582113
0.716502	1.582036
0.718149	1.581961
0.719801	1.581885
0.721455	1.58181
0.723114	1.581735
0.724777	1.581661
0.726443	1.581586
0.728113	1.581513
0.729787	1.581439
0.731465	1.581366
0.733147	1.581294
0.734832	1.581221
0.736522	1.58115
0.738215	1.581078
0.739912	1.581007
0.741614	1.580936
0.743319	1.580865
0.745028	1.580795
0.74674	1.580725
0.748457	1.580656
0.750178	1.580586
0.751903	1.580518
0.753632	1.580449
0.755364	1.580381
0.757101	1.580313
0.758842	1.580245
0.760586	1.580178
0.762335	1.580111
0.764088	1.580045
0.765844	1.579979
0.767605	1.579913
0.76937	1.579847
0.771139	1.579782
0.772912	1.579717
0.774689	1.579652
0.77647	1.579588
0.778255	1.579524
0.780044	1.57946
0.781838	1.579397
0.783635	1.579334
0.785437	1.579271
0.787243	1.579208
0.789053	1.579146
0.790867	1.579084
0.792685	1.579023
0.794507	1.578961
0.796334	1.5789
0.798165	1.57884
0.8	1.578779

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