Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.46764
Extinction coefficient k: 0

Permittivity ε₁: 2.15396
Permittivity ε₂: 0

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

Abbe number V_d: 50.496
Chromatic dispersion dn/dλ: -0.0483887 µm⁻¹

Group index n_g: 1.49607
Group velocity dispersion: 76.5061 fs²/mm

Dispersion parameter D: -417.381 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

# Adipose tissue (body fat): Yanina et al. 2019: n,k 0.475–1.55 µm
adipose_tissue = ls.fetch_refractiveindex("other", "adipose_tissue", "Yanina", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(adipose_tissue.range_nm)  # (475, 1550) nm
eps = adipose_tissue.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_8cc2e61f8180/lightsmith"
adipose_tissue = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(adipose_tissue.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (adipose-tissue/yanina-2019).

# ... load adipose_tissue as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=adipose_tissue)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=475, 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"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_8cc2e61f8180/lightsmith?model=drude_lorentz"
adipose_tissue_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))

A dispersive Drude–Lorentz model for time-domain solvers.

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

Sellmeier (C in µm²) (formula 2), λ in µm

n^{2} - 1 = \frac{1.1236 λ^{2}}{λ^{2} - 0.0105566963} + \frac{0.2725 λ^{2}}{λ^{2} - 18.867}

Valid from 0.475 to 1.55 µm.

Coefficients as stored

C_i	Value
C1	0.0
C2	1.1236
C3	0.0105566963
C4	0.2725
C5	18.867

Comments and conditions

Human abdominal adipose tissue at 23 °C (296 K). See the original publication for temperature-dependent data.

Conditions

temperature: 296 K

References

I. Yu. Yanina, E. N. Lazareva, V. V. Tuchin. Refractive index of adipose tissue and lipid droplet measured in wide spectral and temperature ranges. Appl. Opt. 24, 035003 (2019)

doi:10.1364/ao.57.004839 Refractive index of adipose tissue and lipid droplet measured in wide spectral and temperature ranges, Applied Optics (2018)

Cite

Irina Yu. Yanina, Ekaterina N. Lazareva and Valery V. Tuchin. Refractive index of adipose tissue and lipid droplet measured in wide spectral and temperature ranges. Applied Optics, 57, 4839 (2018), doi:10.1364/ao.57.004839; 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

Adipose tissue (body fat), Yanina et al. 2019: n,k 0.475–1.55 µm: n and k versus wavelength
λ (µm)	n
0.475	1.474942
0.47641	1.474819
0.477824	1.474697
0.479243	1.474576
0.480665	1.474456
0.482092	1.474336
0.483523	1.474217
0.484959	1.474098
0.486398	1.47398
0.487842	1.473863
0.48929	1.473747
0.490743	1.473631
0.4922	1.473516
0.493661	1.473401
0.495126	1.473287
0.496596	1.473174
0.49807	1.473061
0.499549	1.472949
0.501032	1.472838
0.502519	1.472727
0.504011	1.472617
0.505507	1.472507
0.507008	1.472398
0.508513	1.47229
0.510022	1.472182
0.511536	1.472074
0.513055	1.471968
0.514578	1.471862
0.516105	1.471756
0.517637	1.471651
0.519174	1.471547
0.520715	1.471443
0.522261	1.47134
0.523811	1.471237
0.525366	1.471135
0.526926	1.471033
0.52849	1.470932
0.530059	1.470832
0.531633	1.470732
0.533211	1.470632
0.534794	1.470533
0.536381	1.470435
0.537973	1.470337
0.53957	1.470239
0.541172	1.470143
0.542779	1.470046
0.54439	1.46995
0.546006	1.469855
0.547627	1.46976
0.549252	1.469665
0.550883	1.469571
0.552518	1.469478
0.554158	1.469385
0.555803	1.469292
0.557453	1.4692
0.559108	1.469108
0.560768	1.469017
0.562433	1.468926
0.564102	1.468836
0.565777	1.468746
0.567456	1.468657
0.569141	1.468568
0.57083	1.468479
0.572525	1.468391
0.574224	1.468304
0.575929	1.468216
0.577639	1.46813
0.579353	1.468043
0.581073	1.467957
0.582798	1.467872
0.584528	1.467786
0.586264	1.467702
0.588004	1.467617
0.589749	1.467533
0.5915	1.46745
0.593256	1.467366
0.595017	1.467284
0.596783	1.467201
0.598555	1.467119
0.600332	1.467037
0.602114	1.466956
0.603901	1.466875
0.605694	1.466795
0.607492	1.466714
0.609295	1.466634
0.611104	1.466555
0.612918	1.466476
0.614738	1.466397
0.616563	1.466319
0.618393	1.46624
0.620229	1.466163
0.62207	1.466085
0.623916	1.466008
0.625769	1.465931
0.627626	1.465855
0.629489	1.465779
0.631358	1.465703
0.633232	1.465627
0.635112	1.465552
0.636997	1.465477
0.638888	1.465403
0.640785	1.465329
0.642687	1.465255
0.644595	1.465181
0.646508	1.465108
0.648428	1.465035
0.650353	1.464962
0.652283	1.464889
0.654219	1.464817
0.656162	1.464745
0.658109	1.464674
0.660063	1.464602
0.662022	1.464531
0.663988	1.46446
0.665959	1.46439
0.667936	1.46432
0.669919	1.46425
0.671907	1.46418
0.673902	1.46411
0.675902	1.464041
0.677909	1.463972
0.679921	1.463903
0.68194	1.463835
0.683964	1.463767
0.685994	1.463699
0.688031	1.463631
0.690073	1.463563
0.692122	1.463496
0.694176	1.463429
0.696237	1.463362
0.698304	1.463295
0.700377	1.463229
0.702456	1.463163
0.704541	1.463097
0.706633	1.463031
0.70873	1.462966
0.710834	1.4629
0.712944	1.462835
0.715061	1.46277
0.717183	1.462705
0.719312	1.462641
0.721448	1.462577
0.723589	1.462512
0.725737	1.462449
0.727892	1.462385
0.730052	1.462321
0.73222	1.462258
0.734393	1.462195
0.736573	1.462132
0.73876	1.462069
0.740953	1.462006
0.743153	1.461944
0.745359	1.461881
0.747571	1.461819
0.74979	1.461757
0.752016	1.461695
0.754249	1.461633
0.756488	1.461572
0.758733	1.461511
0.760986	1.461449
0.763245	1.461388
0.76551	1.461327
0.767783	1.461267
0.770062	1.461206
0.772348	1.461145
0.774641	1.461085
0.77694	1.461025
0.779247	1.460965
0.78156	1.460905
0.78388	1.460845
0.786207	1.460785
0.788541	1.460725
0.790882	1.460666
0.793229	1.460607
0.795584	1.460547
0.797946	1.460488
0.800315	1.460429
0.80269	1.46037
0.805073	1.460311
0.807463	1.460253
0.80986	1.460194
0.812264	1.460136
0.814676	1.460077
0.817094	1.460019
0.81952	1.459961
0.821952	1.459902
0.824392	1.459844
0.82684	1.459786
0.829294	1.459729
0.831756	1.459671
0.834225	1.459613
0.836701	1.459555
0.839185	1.459498
0.841676	1.45944
0.844175	1.459383
0.846681	1.459325
0.849194	1.459268
0.851715	1.459211
0.854244	1.459154
0.856779	1.459097
0.859323	1.459039
0.861874	1.458982
0.864432	1.458925
0.866998	1.458869
0.869572	1.458812
0.872153	1.458755
0.874742	1.458698
0.877339	1.458641
0.879944	1.458584
0.882556	1.458528
0.885176	1.458471
0.887803	1.458415
0.890439	1.458358
0.893082	1.458301
0.895733	1.458245
0.898392	1.458188
0.901059	1.458132
0.903734	1.458075
0.906417	1.458019
0.909108	1.457962
0.911806	1.457906
0.914513	1.457849
0.917228	1.457793
0.919951	1.457736
0.922682	1.45768
0.925421	1.457623
0.928168	1.457567
0.930923	1.45751
0.933687	1.457454
0.936458	1.457397
0.939238	1.457341
0.942026	1.457284
0.944823	1.457228
0.947628	1.457171
0.950441	1.457115
0.953262	1.457058
0.956092	1.457001
0.95893	1.456945
0.961777	1.456888
0.964632	1.456831
0.967495	1.456774
0.970367	1.456717
0.973248	1.45666
0.976137	1.456604
0.979035	1.456547
0.981941	1.45649
0.984856	1.456432
0.98778	1.456375
0.990712	1.456318
0.993653	1.456261
0.996603	1.456203
0.999561	1.456146
1.00253	1.456089
1.0055	1.456031
1.00849	1.455973
1.01148	1.455916
1.01449	1.455858
1.0175	1.4558
1.02052	1.455742
1.02355	1.455684
1.02659	1.455626
1.02963	1.455568
1.03269	1.45551
1.03576	1.455451
1.03883	1.455393
1.04191	1.455334
1.04501	1.455275
1.04811	1.455217
1.05122	1.455158
1.05434	1.455099
1.05747	1.455039
1.06061	1.45498
1.06376	1.454921
1.06692	1.454861
1.07008	1.454802
1.07326	1.454742
1.07645	1.454682
1.07964	1.454622
1.08285	1.454562
1.08606	1.454502
1.08928	1.454441
1.09252	1.454381
1.09576	1.45432
1.09901	1.454259
1.10228	1.454198
1.10555	1.454137
1.10883	1.454075
1.11212	1.454014
1.11542	1.453952
1.11873	1.45389
1.12206	1.453828
1.12539	1.453766
1.12873	1.453704
1.13208	1.453641
1.13544	1.453578
1.13881	1.453516
1.14219	1.453452
1.14558	1.453389
1.14898	1.453326
1.15239	1.453262
1.15581	1.453198
1.15924	1.453134
1.16269	1.45307
1.16614	1.453005
1.1696	1.45294
1.17307	1.452876
1.17655	1.45281
1.18005	1.452745
1.18355	1.452679
1.18706	1.452614
1.19059	1.452548
1.19412	1.452481
1.19767	1.452415
1.20122	1.452348
1.20479	1.452281
1.20836	1.452214
1.21195	1.452146
1.21555	1.452078
1.21916	1.45201
1.22278	1.451942
1.22641	1.451873
1.23005	1.451805
1.2337	1.451736
1.23736	1.451666
1.24103	1.451597
1.24472	1.451527
1.24841	1.451456
1.25212	1.451386
1.25583	1.451315
1.25956	1.451244
1.2633	1.451172
1.26705	1.451101
1.27081	1.451029
1.27459	1.450956
1.27837	1.450884
1.28216	1.450811
1.28597	1.450737
1.28979	1.450664
1.29362	1.45059
1.29746	1.450515
1.30131	1.450441
1.30517	1.450366
1.30905	1.45029
1.31293	1.450215
1.31683	1.450139
1.32074	1.450062
1.32466	1.449986
1.32859	1.449908
1.33254	1.449831
1.33649	1.449753
1.34046	1.449675
1.34444	1.449596
1.34843	1.449517
1.35243	1.449437
1.35645	1.449358
1.36047	1.449277
1.36451	1.449197
1.36856	1.449116
1.37262	1.449034
1.3767	1.448952
1.38079	1.44887
1.38489	1.448787
1.389	1.448704
1.39312	1.44862
1.39726	1.448536
1.4014	1.448451
1.40556	1.448366
1.40974	1.448281
1.41392	1.448195
1.41812	1.448108
1.42233	1.448021
1.42655	1.447934
1.43078	1.447846
1.43503	1.447758
1.43929	1.447669
1.44356	1.447579
1.44785	1.447489
1.45215	1.447399
1.45646	1.447308
1.46078	1.447217
1.46512	1.447125
1.46947	1.447032
1.47383	1.446939
1.47821	1.446845
1.48259	1.446751
1.48699	1.446656
1.49141	1.446561
1.49584	1.446465
1.50028	1.446368
1.50473	1.446271
1.5092	1.446174
1.51368	1.446075
1.51817	1.445977
1.52268	1.445877
1.5272	1.445777
1.53173	1.445676
1.53628	1.445575
1.54084	1.445473
1.54541	1.44537
1.55	1.445267

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