At one wavelength

Refractive index n: 1.6678
Extinction coefficient k: 0.88032

Permittivity ε₁: 2.00659
Permittivity ε₂: 2.9364

Absorption coefficient α: 188265 cm⁻¹
Penetration depth δ = λ/(2πk): 106.233 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: 0.5 µm⁻¹

Group index n_g: 1.374
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

# C (Carbon, diamond, graphite, graphene, carbon nanotubes): Querry 1985: Graphite pellet, Asbury Micro 260; n,k 0.21–55.6 µm
c = ls.fetch_refractiveindex("main", "C", "Querry-AsburyMicro260", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c.range_nm)  # (210, 55555.6) nm
eps = c.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_4d93b127d784/lightsmith"
c = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (c/querry-1985-asburymicro260).

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

Comments and conditions

Graphite pellet from Asbury Micro 260 powder.

References

M. R. Querry. Optical constants, Contractor Report CRDC-CR-85034 (1985)

Cite

M. R. Querry. Optical constants, Contractor Report CRDC-CR-85034 (1985); Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

612 rows as published

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

C (Carbon, diamond, graphite, graphene, carbon nanotubes), Querry 1985: Graphite pellet, Asbury Micro 260; n,k 0.21–55.6 µm: n and k versus wavelength
λ (µm)	n	k
0.21	0.86	0.689
0.22	0.905	0.784
0.23	0.973	0.88
0.24	1.067	0.969
0.25	1.198	1.026
0.26	1.336	1.019
0.27	1.431	0.969
0.28	1.485	0.916
0.29	1.516	0.873
0.3	1.535	0.84
0.31	1.547	0.813
0.32	1.554	0.796
0.33	1.562	0.785
0.34	1.57	0.771
0.35	1.569	0.76
0.36	1.569	0.758
0.37	1.57	0.759
0.38	1.574	0.762
0.39	1.579	0.766
0.4	1.585	0.768
0.41	1.59	0.769
0.42	1.593	0.772
0.43	1.596	0.776
0.44	1.599	0.781
0.45	1.602	0.788
0.46	1.606	0.795
0.47	1.611	0.802
0.48	1.616	0.81
0.49	1.622	0.817
0.5	1.629	0.822
0.51	1.634	0.828
0.52	1.638	0.834
0.53	1.643	0.84
0.54	1.647	0.846
0.55	1.652	0.853
0.56	1.656	0.86
0.57	1.659	0.867
0.58	1.664	0.875
0.59	1.669	0.882
0.6	1.673	0.889
0.61	1.677	0.897
0.62	1.681	0.904
0.63	1.685	0.912
0.64	1.689	0.92
0.65	1.693	0.927
0.66	1.696	0.935
0.67	1.699	0.945
0.68	1.704	0.954
0.69	1.709	0.963
0.7	1.714	0.972
0.71	1.719	0.98
0.72	1.724	0.989
0.73	1.729	0.997
0.74	1.734	1.006
0.75	1.739	1.014
0.76	1.744	1.023
0.77	1.75	1.032
0.78	1.755	1.04
0.79	1.761	1.048
0.8	1.768	1.055
0.81	1.773	1.06
0.82	1.776	1.068
0.83	1.781	1.076
0.84	1.785	1.083
0.85	1.789	1.091
0.86	1.793	1.098
0.87	1.796	1.107
0.88	1.801	1.116
0.89	1.806	1.124
0.9	1.809	1.131
0.9117	1.813	1.14
0.92	1.817	1.15
0.93	1.821	1.159
0.94	1.826	1.168
0.95	1.831	1.177
0.96	1.836	1.186
0.97	1.841	1.195
0.98	1.846	1.204
0.99	1.851	1.212
1.0	1.857	1.221
1.01	1.862	1.229
1.02	1.867	1.238
1.03	1.872	1.246
1.04	1.877	1.255
1.05	1.882	1.263
1.06	1.888	1.272
1.07	1.893	1.281
1.08	1.899	1.29
1.09	1.905	1.298
1.1	1.91	1.306
1.11	1.915	1.314
1.12	1.92	1.323
1.13	1.925	1.333
1.14	1.932	1.342
1.15	1.938	1.35
1.16	1.944	1.358
1.17	1.95	1.367
1.18	1.957	1.375
1.19	1.962	1.383
1.2	1.97	1.392
1.21	1.977	1.398
1.22	1.982	1.406
1.23	1.989	1.415
1.24	1.995	1.422
1.25	2.001	1.43
1.26	2.008	1.437
1.27	2.015	1.445
1.28	2.021	1.452
1.29	2.026	1.46
1.3	2.033	1.467
1.31	2.04	1.475
1.32	2.046	1.483
1.33	2.053	1.49
1.34	2.06	1.497
1.35	2.067	1.503
1.36	2.073	1.51
1.37	2.079	1.517
1.38	2.086	1.524
1.39	2.093	1.531
1.4	2.099	1.537
1.41	2.105	1.544
1.42	2.112	1.55
1.43	2.117	1.557
1.44	2.124	1.564
1.45	2.131	1.57
1.46	2.137	1.576
1.47	2.143	1.583
1.48	2.149	1.59
1.49	2.155	1.596
1.5	2.162	1.604
1.51	2.17	1.61
1.5205	2.177	1.616
1.53	2.183	1.621
1.54	2.189	1.627
1.55	2.195	1.634
1.56	2.203	1.64
1.57	2.209	1.646
1.58	2.216	1.65
1.59	2.221	1.657
1.6	2.228	1.663
1.61	2.235	1.669
1.62	2.241	1.674
1.63	2.248	1.679
1.64	2.253	1.685
1.65	2.26	1.691
1.66	2.266	1.697
1.67	2.273	1.703
1.68	2.279	1.708
1.69	2.286	1.714
1.7	2.293	1.719
1.71	2.299	1.724
1.72	2.305	1.729
1.73	2.311	1.735
1.74	2.318	1.741
1.75	2.325	1.746
1.7662	2.331	1.751
1.77	2.338	1.756
1.78	2.345	1.761
1.79	2.352	1.766
1.8	2.36	1.77
1.81	2.366	1.773
1.82	2.371	1.777
1.83	2.377	1.783
1.84	2.385	1.787
1.85	2.392	1.791
1.86	2.398	1.793
1.87	2.402	1.796
1.88	2.407	1.801
1.89	2.413	1.806
1.9	2.419	1.81
1.91	2.424	1.814
1.92	2.43	1.818
1.93	2.435	1.823
1.94	2.441	1.827
1.95	2.447	1.831
1.96	2.453	1.835
1.97	2.459	1.839
1.98	2.464	1.843
1.99	2.47	1.847
2.0	2.477	1.851
2.01	2.482	1.852
2.02	2.486	1.857
2.03	2.492	1.861
2.04	2.497	1.865
2.05	2.502	1.868
2.06	2.508	1.872
2.07	2.513	1.875
2.08	2.518	1.879
2.09	2.523	1.882
2.1	2.526	1.886
2.11	2.533	1.888
2.12	2.537	1.892
2.13	2.542	1.895
2.14	2.547	1.898
2.15	2.551	1.902
2.16	2.556	1.906
2.17	2.56	1.909
2.18	2.564	1.912
2.19	2.568	1.916
2.2	2.572	1.92
2.21	2.576	1.924
2.22	2.581	1.928
2.23	2.585	1.931
2.24	2.589	1.935
2.25	2.594	1.939
2.26	2.598	1.942
2.27	2.601	1.946
2.28	2.605	1.95
2.29	2.609	1.954
2.3	2.613	1.958
2.31	2.617	1.962
2.32	2.621	1.966
2.33	2.625	1.971
2.34	2.629	1.975
2.35	2.633	1.979
2.36	2.637	1.983
2.37	2.641	1.987
2.38	2.645	1.992
2.39	2.65	1.996
2.4	2.654	1.999
2.41	2.658	2.003
2.42	2.662	2.007
2.43	2.666	2.012
2.44	2.67	2.015
2.45	2.674	2.019
2.46	2.677	2.023
2.47	2.681	2.028
2.48	2.685	2.032
2.49	2.688	2.037
2.5	2.691	2.043
2.5063	2.696	2.047
2.5126	2.699	2.045
2.5189	2.699	2.051
2.5253	2.705	2.053
2.5316	2.707	2.054
2.5381	2.709	2.057
2.5445	2.709	2.061
2.551	2.714	2.066
2.5575	2.718	2.067
2.5641	2.719	2.069
2.5707	2.722	2.073
2.5773	2.725	2.074
2.584	2.727	2.078
2.5907	2.73	2.081
2.5974	2.732	2.086
2.6042	2.738	2.086
2.611	2.736	2.088
2.6178	2.741	2.093
2.6247	2.741	2.096
2.6316	2.746	2.1
2.6385	2.749	2.103
2.6455	2.753	2.107
2.6525	2.757	2.109
2.6596	2.758	2.111
2.6667	2.76	2.117
2.6738	2.766	2.118
2.681	2.766	2.122
2.6882	2.771	2.126
2.6954	2.775	2.129
2.7027	2.778	2.131
2.71	2.779	2.134
2.7174	2.784	2.142
2.7248	2.791	2.141
2.7322	2.791	2.145
2.7397	2.796	2.149
2.7473	2.797	2.15
2.7548	2.8	2.154
2.7624	2.803	2.158
2.7701	2.807	2.163
2.7778	2.812	2.166
2.7855	2.817	2.168
2.7933	2.816	2.171
2.8011	2.823	2.176
2.809	2.827	2.176
2.8169	2.827	2.178
2.8249	2.83	2.186
2.8329	2.837	2.19
2.8409	2.841	2.193
2.849	2.844	2.196
2.8571	2.85	2.2
2.8653	2.853	2.201
2.8736	2.857	2.205
2.8818	2.859	2.205
2.8902	2.86	2.211
2.8986	2.865	2.216
2.907	2.869	2.222
2.9155	2.877	2.226
2.924	2.881	2.226
2.9326	2.886	2.228
2.9412	2.885	2.231
2.9499	2.89	2.237
2.9586	2.895	2.242
2.9674	2.902	2.245
2.9762	2.904	2.248
2.9851	2.91	2.254
2.994	2.916	2.253
3.003	2.917	2.255
3.012	2.922	2.263
3.0211	2.929	2.265
3.0303	2.93	2.269
3.0395	2.939	2.273
3.0488	2.942	2.273
3.0581	2.945	2.277
3.0675	2.949	2.28
3.0769	2.953	2.285
3.0864	2.959	2.287
3.096	2.962	2.291
3.1056	2.968	2.296
3.1153	2.973	2.298
3.125	2.976	2.301
3.1348	2.983	2.307
3.1447	2.989	2.308
3.1546	2.993	2.31
3.1646	2.996	2.313
3.1746	3.003	2.318
3.1847	3.006	2.32
3.1949	3.011	2.324
3.2051	3.018	2.325
3.2154	3.019	2.327
3.2258	3.023	2.334
3.2362	3.03	2.34
3.2468	3.039	2.339
3.2573	3.041	2.341
3.268	3.046	2.345
3.2787	3.048	2.347
3.2895	3.053	2.353
3.3003	3.061	2.356
3.3113	3.065	2.357
3.3223	3.07	2.361
3.3333	3.075	2.361
3.3445	3.078	2.366
3.3557	3.083	2.37
3.367	3.087	2.374
3.3784	3.092	2.377
3.3898	3.1	2.381
3.4014	3.104	2.38
3.413	3.104	2.386
3.4247	3.111	2.39
3.4364	3.117	2.393
3.4483	3.121	2.396
3.4602	3.125	2.4
3.4722	3.13	2.404
3.4843	3.135	2.406
3.4965	3.139	2.41
3.5088	3.142	2.415
3.5211	3.146	2.422
3.5336	3.157	2.424
3.5461	3.161	2.427
3.5587	3.166	2.432
3.5714	3.172	2.435
3.5842	3.178	2.438
3.5971	3.184	2.441
3.6101	3.187	2.444
3.6232	3.192	2.45
3.6364	3.2	2.451
3.6496	3.203	2.455
3.663	3.21	2.46
3.6765	3.215	2.462
3.69	3.22	2.465
3.7037	3.223	2.468
3.7175	3.227	2.474
3.7313	3.236	2.478
3.7453	3.24	2.48
3.7594	3.242	2.486
3.7736	3.25	2.492
3.7879	3.258	2.494
3.8023	3.263	2.498
3.8168	3.268	2.502
3.8314	3.273	2.506
3.8462	3.281	2.511
3.861	3.287	2.513
3.876	3.29	2.515
3.8911	3.294	2.52
3.9063	3.299	2.527
3.9216	3.307	2.533
3.937	3.312	2.536
3.9526	3.319	2.542
3.9683	3.327	2.544
3.9841	3.332	2.549
4.0	3.337	2.551
4.0161	3.341	2.557
4.0323	3.35	2.561
4.0486	3.355	2.563
4.065	3.359	2.571
4.0816	3.37	2.573
4.0984	3.374	2.576
4.1152	3.378	2.58
4.1322	3.382	2.587
4.1494	3.385	2.59
4.1667	3.392	2.595
4.1841	3.393	2.6
4.2017	3.391	2.614
4.2194	3.403	2.636
4.2373	3.429	2.645
4.2553	3.439	2.64
4.2735	3.447	2.649
4.2918	3.467	2.65
4.3103	3.477	2.643
4.329	3.484	2.639
4.3478	3.486	2.639
4.3668	3.489	2.642
4.386	3.491	2.647
4.4053	3.496	2.654
4.4248	3.504	2.659
4.4444	3.511	2.663
4.4643	3.517	2.669
4.4843	3.525	2.672
4.5045	3.528	2.676
4.5249	3.536	2.683
4.5455	3.544	2.686
4.5662	3.55	2.692
4.5872	3.557	2.699
4.6083	3.564	2.703
4.6296	3.571	2.712
4.6512	3.581	2.712
4.6729	3.582	2.719
4.6948	3.596	2.729
4.717	3.606	2.73
4.7393	3.61	2.733
4.7619	3.617	2.742
4.7847	3.626	2.748
4.8077	3.637	2.755
4.8309	3.647	2.754
4.8544	3.65	2.758
4.878	3.659	2.764
4.902	3.665	2.77
4.9261	3.676	2.777
4.9505	3.683	2.781
4.9751	3.687	2.783
5.0	3.681	2.798
5.0251	3.7	2.82
5.0505	3.72	2.823
5.0761	3.733	2.828
5.102	3.746	2.83
5.1282	3.756	2.833
5.1546	3.766	2.838
5.1813	3.778	2.843
5.2083	3.789	2.846
5.2356	3.8	2.849
5.2632	3.809	2.853
5.291	3.82	2.857
5.3191	3.829	2.861
5.3476	3.841	2.867
5.3763	3.852	2.868
5.4054	3.861	2.871
5.4348	3.87	2.875
5.4645	3.88	2.879
5.4945	3.891	2.884
5.5249	3.901	2.886
5.5556	3.91	2.891
5.5866	3.921	2.893
5.618	3.929	2.895
5.6497	3.938	2.9
5.6818	3.945	2.903
5.7143	3.954	2.912
5.7471	3.967	2.915
5.7803	3.976	2.918
5.814	3.986	2.922
5.848	3.994	2.924
5.8824	4.002	2.929
5.9172	4.013	2.938
5.9524	4.026	2.937
5.988	4.03	2.942
6.0241	4.04	2.946
6.0606	4.046	2.952
6.0976	4.059	2.957
6.135	4.065	2.957
6.1728	4.073	2.965
6.2112	4.074	2.966
6.25	4.067	2.982
6.2893	4.083	3.015
6.3291	4.12	3.026
6.3694	4.141	3.017
6.4103	4.148	3.013
6.4516	4.159	3.014
6.4935	4.163	3.02
6.5359	4.177	3.027
6.5789	4.187	3.03
6.6225	4.197	3.034
6.6667	4.205	3.04
6.7114	4.216	3.047
6.7568	4.228	3.051
6.8027	4.237	3.055
6.8493	4.247	3.062
6.8966	4.258	3.068
6.9444	4.268	3.074
6.993	4.277	3.08
7.0423	4.288	3.088
7.0922	4.301	3.094
7.1429	4.309	3.1
7.1942	4.323	3.106
7.2464	4.332	3.109
7.2993	4.342	3.118
7.3529	4.352	3.123
7.4074	4.366	3.13
7.4627	4.372	3.131
7.5188	4.378	3.142
7.5758	4.388	3.149
7.6336	4.398	3.158
7.6923	4.409	3.165
7.7519	4.417	3.175
7.8125	4.43	3.185
7.874	4.433	3.188
7.9365	4.441	3.207
8.0	4.456	3.217
8.0645	4.466	3.23
8.1301	4.481	3.243
8.1967	4.494	3.252
8.2645	4.507	3.262
8.3333	4.519	3.272
8.4034	4.534	3.285
8.4746	4.549	3.296
8.547	4.562	3.304
8.6207	4.572	3.31
8.6957	4.582	3.323
8.7719	4.6	3.339
8.8496	4.614	3.344
8.9286	4.621	3.354
9.009	4.631	3.368
9.0909	4.643	3.368
9.1743	4.665	3.402
9.2593	4.681	3.409
9.3458	4.691	3.421
9.434	4.706	3.434
9.5238	4.721	3.45
9.6154	4.741	3.464
9.7087	4.753	3.471
9.8039	4.765	3.488
9.901	4.784	3.497
10.0	4.791	3.513
10.101	4.806	3.531
10.2041	4.822	3.546
10.3093	4.839	3.561
10.4167	4.856	3.58
10.5263	4.874	3.595
10.6383	4.891	3.608
10.7527	4.907	3.62
10.8696	4.92	3.636
10.989	4.935	3.651
11.1111	4.947	3.666
11.236	4.959	3.686
11.3636	4.968	3.702
11.4943	4.977	3.744
11.6279	5.018	3.767
11.7647	5.032	3.775
11.9048	5.045	3.797
12.0482	5.061	3.819
12.1951	5.075	3.846
12.3457	5.098	3.877
12.5	5.124	3.9
12.6582	5.144	3.918
12.8205	5.16	3.943
12.987	5.186	3.971
13.1579	5.207	3.991
13.3333	5.222	4.015
13.5135	5.24	4.044
13.6986	5.259	4.071
13.8889	5.276	4.103
14.0845	5.296	4.133
14.2857	5.313	4.165
14.4928	5.326	4.21
14.7059	5.358	4.256
14.9254	5.392	4.293
15.1515	5.42	4.32
15.3846	5.433	4.357
15.625	5.447	4.404
15.873	5.479	4.469
16.129	5.522	4.511
16.3934	5.558	4.559
16.6667	5.594	4.6
16.9492	5.625	4.651
17.2414	5.665	4.698
17.5439	5.705	4.748
17.8571	5.746	4.798
18.1818	5.778	4.849
18.5185	5.816	4.906
18.8679	5.858	4.962
19.2308	5.902	5.022
19.6078	5.939	5.076
20.0	5.965	5.149
20.4082	6.015	5.234
20.8333	6.065	5.317
21.2766	6.128	5.406
21.7391	6.184	5.484
22.2222	6.248	5.576
22.7273	6.315	5.67
23.2558	6.403	5.774
23.8095	6.496	5.863
24.3902	6.583	5.955
25.0	6.665	6.046
25.641	6.753	6.154
26.3158	6.864	6.257
27.027	6.96	6.362
27.7778	7.073	6.474
28.5714	7.165	6.58
29.4118	7.269	6.767
30.303	7.456	6.925
31.25	7.616	7.057
32.2581	7.798	7.193
33.3333	7.97	7.361
34.4828	8.216	7.528
35.7143	8.443	7.671
37.037	8.719	7.833
38.4615	9.032	7.91
40.0	9.205	8.039
41.6667	9.632	8.238
43.4783	9.809	8.196
45.4545	10.079	8.493
47.619	10.478	8.667
50.0	10.837	8.888
52.6316	11.354	9.407
55.5556	12.433	9.539

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