Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.73938
Extinction coefficient k: 0

Permittivity ε₁: 3.02544
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.236777 µm⁻¹

Group index n_g: 1.87851
Group velocity dispersion: 629.829 fs²/mm

Dispersion parameter D: -3436.05 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

# E7: Li et al. 2005: n(e) 0.450–0.656 µm
e7 = ls.fetch_refractiveindex("other", "E7", "Li-e", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(e7.range_nm)  # (450, 656) nm
eps = e7.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_06e785ea0d67/lightsmith"
e7 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(e7.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (e7/li-2005-e).

# ... load e7 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=e7)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=450, stop_nm=656, 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 = 1.6933 + 0.0078 λ^{- 2.0} + 0.0028 λ^{- 4.0}

Valid from 0.45 to 0.656 µm.

Coefficients as stored

C_i	Value
C1	1.6933
C2	0.0078
C3	-2.0
C4	0.0028
C5	-4.0

Comments and conditions

25 °C. Extraordinary ray (e).

Conditions

temperature: 298 K
direction: e

References

J. Li, C. H. Wen, S. Gauza, R. Lu, S. T. Wu. Refractive indices of liquid crystals for display applications. J. Disp. Technol. 1, 51-61, 2005

doi:10.1109/jdt.2005.853357 Refractive Indices of Liquid Crystals for Display Applications, Journal of Display Technology (2005)

Cite

J. Li, C.-H. Wen, S. Gauza, R. Lu and S.-T. Wu. Refractive Indices of Liquid Crystals for Display Applications. Journal of Display Technology, 1, 51-61 (2005), doi:10.1109/jdt.2005.853357; 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

E7, Li et al. 2005: n(e) 0.450–0.656 µm: n and k versus wavelength
λ (µm)	n
0.45	1.800101
0.450425	1.799771
0.450851	1.799441
0.451277	1.799113
0.451704	1.798787
0.45213	1.798461
0.452558	1.798136
0.452985	1.797812
0.453414	1.79749
0.453842	1.797168
0.454271	1.796848
0.4547	1.796529
0.45513	1.79621
0.45556	1.795893
0.455991	1.795577
0.456422	1.795262
0.456853	1.794948
0.457285	1.794635
0.457717	1.794323
0.45815	1.794012
0.458583	1.793702
0.459016	1.793394
0.45945	1.793086
0.459884	1.792779
0.460319	1.792473
0.460754	1.792169
0.461189	1.791865
0.461625	1.791563
0.462061	1.791261
0.462498	1.79096
0.462935	1.790661
0.463373	1.790362
0.463811	1.790064
0.464249	1.789768
0.464688	1.789472
0.465127	1.789177
0.465566	1.788884
0.466006	1.788591
0.466447	1.788299
0.466888	1.788009
0.467329	1.787719
0.467771	1.78743
0.468213	1.787142
0.468655	1.786855
0.469098	1.786569
0.469541	1.786284
0.469985	1.786
0.470429	1.785717
0.470874	1.785435
0.471319	1.785154
0.471764	1.784874
0.47221	1.784594
0.472657	1.784316
0.473103	1.784038
0.47355	1.783762
0.473998	1.783486
0.474446	1.783211
0.474894	1.782938
0.475343	1.782665
0.475792	1.782393
0.476242	1.782122
0.476692	1.781851
0.477143	1.781582
0.477594	1.781314
0.478045	1.781046
0.478497	1.78078
0.478949	1.780514
0.479402	1.780249
0.479855	1.779985
0.480308	1.779722
0.480762	1.77946
0.481217	1.779198
0.481671	1.778938
0.482127	1.778678
0.482582	1.778419
0.483038	1.778161
0.483495	1.777904
0.483952	1.777648
0.484409	1.777393
0.484867	1.777138
0.485325	1.776885
0.485784	1.776632
0.486243	1.77638
0.486703	1.776129
0.487162	1.775878
0.487623	1.775629
0.488084	1.77538
0.488545	1.775132
0.489007	1.774885
0.489469	1.774639
0.489932	1.774393
0.490395	1.774149
0.490858	1.773905
0.491322	1.773662
0.491786	1.77342
0.492251	1.773178
0.492716	1.772938
0.493182	1.772698
0.493648	1.772459
0.494115	1.772221
0.494582	1.771983
0.495049	1.771746
0.495517	1.771511
0.495985	1.771275
0.496454	1.771041
0.496923	1.770808
0.497393	1.770575
0.497863	1.770343
0.498333	1.770111
0.498804	1.769881
0.499276	1.769651
0.499748	1.769422
0.50022	1.769194
0.500693	1.768966
0.501166	1.76874
0.501639	1.768514
0.502114	1.768288
0.502588	1.768064
0.503063	1.76784
0.503539	1.767617
0.504014	1.767395
0.504491	1.767173
0.504968	1.766952
0.505445	1.766732
0.505923	1.766513
0.506401	1.766294
0.506879	1.766076
0.507358	1.765859
0.507838	1.765642
0.508318	1.765426
0.508798	1.765211
0.509279	1.764997
0.50976	1.764783
0.510242	1.76457
0.510724	1.764357
0.511207	1.764146
0.51169	1.763935
0.512174	1.763725
0.512658	1.763515
0.513142	1.763306
0.513627	1.763098
0.514113	1.76289
0.514599	1.762683
0.515085	1.762477
0.515572	1.762272
0.516059	1.762067
0.516547	1.761863
0.517035	1.761659
0.517524	1.761456
0.518013	1.761254
0.518502	1.761053
0.518992	1.760852
0.519483	1.760652
0.519974	1.760452
0.520465	1.760253
0.520957	1.760055
0.521449	1.759857
0.521942	1.75966
0.522435	1.759464
0.522929	1.759268
0.523423	1.759073
0.523918	1.758879
0.524413	1.758685
0.524909	1.758492
0.525405	1.758299
0.525902	1.758107
0.526399	1.757916
0.526896	1.757725
0.527394	1.757535
0.527892	1.757346
0.528391	1.757157
0.528891	1.756969
0.529391	1.756781
0.529891	1.756594
0.530392	1.756408
0.530893	1.756222
0.531395	1.756037
0.531897	1.755852
0.5324	1.755668
0.532903	1.755485
0.533406	1.755302
0.533911	1.75512
0.534415	1.754939
0.53492	1.754758
0.535426	1.754577
0.535932	1.754397
0.536438	1.754218
0.536945	1.754039
0.537453	1.753861
0.537961	1.753684
0.538469	1.753507
0.538978	1.75333
0.539487	1.753155
0.539997	1.752979
0.540508	1.752805
0.541018	1.75263
0.54153	1.752457
0.542042	1.752284
0.542554	1.752111
0.543067	1.75194
0.54358	1.751768
0.544094	1.751597
0.544608	1.751427
0.545122	1.751258
0.545638	1.751088
0.546153	1.75092
0.546669	1.750752
0.547186	1.750584
0.547703	1.750417
0.548221	1.750251
0.548739	1.750085
0.549258	1.74992
0.549777	1.749755
0.550296	1.749591
0.550816	1.749427
0.551337	1.749263
0.551858	1.749101
0.55238	1.748939
0.552902	1.748777
0.553424	1.748616
0.553947	1.748455
0.554471	1.748295
0.554995	1.748135
0.555519	1.747976
0.556044	1.747818
0.55657	1.74766
0.557096	1.747502
0.557622	1.747345
0.558149	1.747188
0.558677	1.747032
0.559205	1.746877
0.559733	1.746722
0.560262	1.746567
0.560792	1.746413
0.561322	1.746259
0.561852	1.746106
0.562383	1.745954
0.562915	1.745802
0.563447	1.74565
0.563979	1.745499
0.564512	1.745348
0.565046	1.745198
0.56558	1.745048
0.566114	1.744899
0.566649	1.74475
0.567185	1.744602
0.567721	1.744454
0.568258	1.744307
0.568795	1.74416
0.569332	1.744014
0.56987	1.743868
0.570409	1.743722
0.570948	1.743577
0.571488	1.743433
0.572028	1.743289
0.572568	1.743145
0.573109	1.743002
0.573651	1.742859
0.574193	1.742717
0.574736	1.742575
0.575279	1.742434
0.575823	1.742293
0.576367	1.742152
0.576912	1.742012
0.577457	1.741873
0.578003	1.741734
0.578549	1.741595
0.579096	1.741457
0.579643	1.741319
0.580191	1.741182
0.580739	1.741045
0.581288	1.740908
0.581837	1.740772
0.582387	1.740636
0.582938	1.740501
0.583489	1.740366
0.58404	1.740232
0.584592	1.740098
0.585144	1.739965
0.585697	1.739832
0.586251	1.739699
0.586805	1.739567
0.58736	1.739435
0.587915	1.739304
0.58847	1.739173
0.589027	1.739042
0.589583	1.738912
0.59014	1.738782
0.590698	1.738653
0.591256	1.738524
0.591815	1.738395
0.592375	1.738267
0.592934	1.738139
0.593495	1.738012
0.594056	1.737885
0.594617	1.737759
0.595179	1.737633
0.595742	1.737507
0.596305	1.737382
0.596868	1.737257
0.597432	1.737132
0.597997	1.737008
0.598562	1.736884
0.599128	1.736761
0.599694	1.736638
0.600261	1.736515
0.600828	1.736393
0.601396	1.736271
0.601964	1.73615
0.602533	1.736029
0.603103	1.735908
0.603673	1.735788
0.604243	1.735668
0.604814	1.735548
0.605386	1.735429
0.605958	1.73531
0.606531	1.735192
0.607104	1.735074
0.607678	1.734956
0.608252	1.734839
0.608827	1.734722
0.609402	1.734605
0.609978	1.734489
0.610555	1.734373
0.611132	1.734258
0.611709	1.734143
0.612287	1.734028
0.612866	1.733914
0.613445	1.7338
0.614025	1.733686
0.614605	1.733572
0.615186	1.733459
0.615768	1.733347
0.61635	1.733235
0.616932	1.733123
0.617515	1.733011
0.618099	1.7329
0.618683	1.732789
0.619268	1.732678
0.619853	1.732568
0.620439	1.732458
0.621025	1.732349
0.621612	1.73224
0.622199	1.732131
0.622787	1.732022
0.623376	1.731914
0.623965	1.731806
0.624555	1.731699
0.625145	1.731592
0.625736	1.731485
0.626327	1.731378
0.626919	1.731272
0.627512	1.731166
0.628105	1.731061
0.628698	1.730956
0.629293	1.730851
0.629887	1.730746
0.630483	1.730642
0.631079	1.730538
0.631675	1.730435
0.632272	1.730332
0.63287	1.730229
0.633468	1.730126
0.634066	1.730024
0.634666	1.729922
0.635265	1.72982
0.635866	1.729719
0.636467	1.729618
0.637068	1.729517
0.63767	1.729417
0.638273	1.729317
0.638876	1.729217
0.63948	1.729118
0.640084	1.729018
0.640689	1.72892
0.641295	1.728821
0.641901	1.728723
0.642508	1.728625
0.643115	1.728527
0.643723	1.72843
0.644331	1.728333
0.64494	1.728236
0.645549	1.72814
0.64616	1.728044
0.64677	1.727948
0.647381	1.727852
0.647993	1.727757
0.648606	1.727662
0.649219	1.727567
0.649832	1.727473
0.650446	1.727379
0.651061	1.727285
0.651677	1.727192
0.652292	1.727098
0.652909	1.727005
0.653526	1.726913
0.654144	1.72682
0.654762	1.726728
0.655381	1.726637
0.656	1.726545

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