At one wavelength

Refractive index n: 2.00428
Extinction coefficient k: 0.9268

Permittivity ε₁: 3.15818
Permittivity ε₂: 3.71513

Absorption coefficient α: 198205 cm⁻¹
Penetration depth δ = λ/(2πk): 100.906 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: 0.3 µm⁻¹

Group index n_g: 1.828
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: Intercalated graphite pellet, Asbury 3222; n,k 0.20–55.6 µm
c = ls.fetch_refractiveindex("main", "C", "Querry-Asbury3222", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c.range_nm)  # (200, 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_f00236a00cc7/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-asbury3222).

# ... 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

Intercalated graphite pellet from Asbury 3222 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

613 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: Intercalated graphite pellet, Asbury 3222; n,k 0.20–55.6 µm: n and k versus wavelength
λ (µm)	n	k
0.2	0.827	0.761
0.21	0.875	0.881
0.22	0.918	1.022
0.23	0.998	1.167
0.24	1.125	1.312
0.25	1.325	1.416
0.26	1.548	1.413
0.27	1.707	1.333
0.28	1.802	1.243
0.29	1.859	1.162
0.3	1.892	1.094
0.31	1.908	1.038
0.32	1.916	1.0
0.33	1.928	0.97
0.34	1.934	0.937
0.35	1.93	0.914
0.36	1.927	0.902
0.37	1.927	0.895
0.38	1.936	0.89
0.39	1.935	0.884
0.4	1.94	0.879
0.41	1.942	0.873
0.42	1.942	0.87
0.43	1.943	0.87
0.44	1.944	0.872
0.45	1.947	0.875
0.46	1.951	0.879
0.47	1.956	0.882
0.48	1.961	0.886
0.49	1.967	0.888
0.5	1.972	0.89
0.51	1.976	0.891
0.52	1.98	0.896
0.53	1.984	0.9
0.54	1.987	0.903
0.55	1.99	0.907
0.56	1.993	0.912
0.57	1.997	0.919
0.58	2.002	0.923
0.59	2.005	0.928
0.6	2.009	0.933
0.61	2.012	0.94
0.62	2.016	0.945
0.63	2.02	0.954
0.64	2.028	0.96
0.65	2.033	0.961
0.66	2.033	0.966
0.67	2.036	0.974
0.68	2.04	0.982
0.69	2.045	0.989
0.7	2.05	0.995
0.71	2.055	1.002
0.72	2.059	1.008
0.73	2.064	1.014
0.74	2.067	1.02
0.75	2.072	1.028
0.76	2.078	1.035
0.77	2.083	1.04
0.78	2.088	1.046
0.79	2.092	1.051
0.8	2.097	1.056
0.81	2.1	1.061
0.82	2.103	1.067
0.83	2.106	1.074
0.84	2.11	1.082
0.85	2.115	1.088
0.86	2.119	1.094
0.87	2.124	1.099
0.88	2.128	1.103
0.89	2.129	1.108
0.9	2.131	1.115
0.91	2.134	1.123
0.92	2.138	1.13
0.93	2.141	1.136
0.9402	2.145	1.142
0.95	2.147	1.149
0.96	2.15	1.156
0.97	2.154	1.162
0.98	2.156	1.168
0.99	2.158	1.175
1.0	2.161	1.183
1.01	2.163	1.19
1.02	2.165	1.198
1.03	2.168	1.206
1.04	2.171	1.214
1.05	2.175	1.222
1.06	2.178	1.23
1.07	2.182	1.236
1.08	2.185	1.246
1.09	2.189	1.253
1.1	2.191	1.26
1.11	2.194	1.26
1.12	2.197	1.277
1.13	2.2	1.286
1.14	2.205	1.295
1.15	2.209	1.303
1.16	2.212	1.311
1.17	2.215	1.319
1.18	2.219	1.327
1.19	2.221	1.335
1.2	2.223	1.347
1.21	2.23	1.359
1.22	2.237	1.366
1.23	2.242	1.374
1.24	2.248	1.382
1.25	2.253	1.39
1.26	2.258	1.397
1.27	2.264	1.405
1.28	2.268	1.412
1.29	2.273	1.419
1.3	2.277	1.427
1.31	2.282	1.435
1.32	2.287	1.443
1.3304	2.292	1.45
1.34	2.297	1.458
1.35	2.303	1.466
1.36	2.307	1.473
1.37	2.312	1.48
1.38	2.317	1.488
1.39	2.322	1.496
1.4	2.328	1.504
1.41	2.333	1.512
1.42	2.339	1.519
1.43	2.344	1.526
1.44	2.35	1.534
1.45	2.356	1.541
1.46	2.362	1.548
1.47	2.368	1.555
1.48	2.374	1.561
1.49	2.38	1.568
1.5	2.386	1.574
1.51	2.392	1.58
1.52	2.397	1.586
1.5347	2.403	1.591
1.54	2.407	1.597
1.55	2.413	1.604
1.56	2.419	1.609
1.57	2.423	1.614
1.58	2.428	1.619
1.59	2.431	1.626
1.6	2.436	1.632
1.61	2.441	1.638
1.62	2.445	1.645
1.63	2.45	1.651
1.64	2.455	1.658
1.65	2.459	1.664
1.66	2.464	1.67
1.67	2.468	1.677
1.68	2.473	1.684
1.69	2.478	1.691
1.7	2.484	1.697
1.71	2.488	1.704
1.72	2.494	1.711
1.73	2.5	1.718
1.74	2.505	1.724
1.75	2.512	1.73
1.76	2.517	1.736
1.77	2.523	1.742
1.78	2.529	1.748
1.79	2.535	1.753
1.8	2.542	1.758
1.81	2.548	1.762
1.82	2.552	1.767
1.83	2.557	1.773
1.84	2.564	1.778
1.85	2.571	1.782
1.86	2.576	1.784
1.87	2.577	1.787
1.88	2.58	1.794
1.89	2.585	1.799
1.9	2.589	1.805
1.91	2.593	1.81
1.92	2.598	1.816
1.93	2.603	1.822
1.94	2.608	1.827
1.95	2.613	1.831
1.96	2.618	1.836
1.97	2.622	1.84
1.98	2.626	1.845
1.99	2.629	1.849
2.0	2.631	1.857
2.01	2.638	1.865
2.02	2.645	1.869
2.03	2.65	1.873
2.04	2.654	1.877
2.05	2.659	1.882
2.06	2.663	1.886
2.07	2.667	1.891
2.08	2.671	1.896
2.09	2.676	1.901
2.1	2.681	1.905
2.11	2.685	1.91
2.12	2.689	1.914
2.13	2.693	1.918
2.14	2.697	1.923
2.15	2.7	1.927
2.16	2.704	1.932
2.17	2.708	1.937
2.18	2.712	1.94
2.19	2.714	1.945
2.2	2.717	1.95
2.21	2.72	1.955
2.22	2.724	1.961
2.23	2.727	1.966
2.24	2.73	1.971
2.25	2.732	1.977
2.26	2.735	1.984
2.27	2.738	1.992
2.28	2.744	2.0
2.29	2.751	2.006
2.3	2.761	2.012
2.31	2.766	2.011
2.32	2.768	2.014
2.33	2.77	2.019
2.34	2.774	2.025
2.35	2.778	2.03
2.36	2.782	2.035
2.37	2.785	2.04
2.38	2.79	2.045
2.39	2.794	2.049
2.4	2.798	2.054
2.41	2.802	2.058
2.42	2.805	2.063
2.43	2.808	2.068
2.44	2.811	2.073
2.45	2.814	2.079
2.46	2.818	2.085
2.47	2.823	2.091
2.48	2.828	2.096
2.49	2.833	2.101
2.5	2.837	2.104
2.5063	2.838	2.108
2.5126	2.842	2.111
2.5189	2.845	2.113
2.5253	2.846	2.116
2.5316	2.847	2.119
2.5381	2.849	2.123
2.5445	2.852	2.128
2.551	2.856	2.13
2.5575	2.857	2.134
2.5641	2.862	2.137
2.5707	2.865	2.139
2.5773	2.867	2.141
2.584	2.868	2.145
2.5907	2.871	2.15
2.5974	2.874	2.153
2.6042	2.878	2.155
2.611	2.88	2.156
2.6178	2.881	2.16
2.6247	2.883	2.164
2.6316	2.886	2.168
2.6385	2.888	2.171
2.6455	2.89	2.175
2.6525	2.894	2.179
2.6596	2.896	2.182
2.6667	2.898	2.187
2.6738	2.904	2.19
2.681	2.907	2.192
2.6882	2.908	2.192
2.6954	2.906	2.197
2.7027	2.908	2.204
2.71	2.912	2.21
2.7174	2.916	2.213
2.7248	2.918	2.217
2.7322	2.922	2.221
2.7397	2.926	2.226
2.7473	2.93	2.229
2.7548	2.933	2.233
2.7624	2.935	2.237
2.7701	2.939	2.241
2.7778	2.944	2.245
2.7855	2.947	2.248
2.7933	2.949	2.251
2.8011	2.952	2.256
2.809	2.956	2.26
2.8169	2.961	2.263
2.8249	2.962	2.265
2.8329	2.964	2.269
2.8409	2.967	2.274
2.849	2.97	2.279
2.8571	2.974	2.283
2.8653	2.977	2.288
2.8736	2.982	2.293
2.8818	2.986	2.296
2.8902	2.989	2.299
2.8986	2.992	2.303
2.907	2.996	2.308
2.9155	3.0	2.311
2.924	3.002	2.314
2.9326	3.005	2.32
2.9412	3.01	2.325
2.9499	3.015	2.328
2.9586	3.02	2.331
2.9674	3.021	2.333
2.9762	3.024	2.338
2.9851	3.028	2.342
2.994	3.03	2.346
3.003	3.033	2.35
3.012	3.035	2.357
3.0211	3.039	2.363
3.0303	3.043	2.37
3.0395	3.051	2.375
3.0488	3.056	2.378
3.0581	3.061	2.38
3.0675	3.064	2.384
3.0769	3.067	2.389
3.0864	3.071	2.395
3.096	3.077	2.4
3.1056	3.083	2.404
3.1153	3.089	2.407
3.125	3.093	2.41
3.1348	3.097	2.413
3.1447	3.1	2.418
3.1546	3.104	2.423
3.1646	3.11	2.427
3.1746	3.116	2.43
3.1847	3.119	2.433
3.1949	3.123	2.436
3.2051	3.127	2.441
3.2154	3.131	2.443
3.2258	3.132	2.448
3.2362	3.138	2.456
3.2468	3.144	2.46
3.2573	3.15	2.463
3.268	3.154	2.467
3.2787	3.16	2.473
3.2895	3.165	2.473
3.3003	3.169	2.478
3.3113	3.172	2.482
3.3223	3.178	2.486
3.3333	3.184	2.489
3.3445	3.187	2.492
3.3557	3.191	2.497
3.367	3.195	2.501
3.3784	3.201	2.504
3.3898	3.204	2.507
3.4014	3.206	2.512
3.413	3.212	2.517
3.4247	3.216	2.522
3.4364	3.222	2.524
3.4483	3.223	2.529
3.4602	3.228	2.533
3.4722	3.231	2.54
3.4843	3.237	2.544
3.4965	3.24	2.548
3.5088	3.244	2.555
3.5211	3.251	2.562
3.5336	3.26	2.566
3.5461	3.265	2.567
3.5587	3.268	2.57
3.5714	3.273	2.574
3.5842	3.277	2.579
3.5971	3.281	2.582
3.6101	3.285	2.588
3.6232	3.29	2.592
3.6364	3.294	2.596
3.6496	3.299	2.6
3.663	3.304	2.604
3.6765	3.306	2.607
3.69	3.308	2.614
3.7037	3.313	2.62
3.7175	3.319	2.627
3.7313	3.324	2.629
3.7453	3.326	2.635
3.7594	3.331	2.64
3.7736	3.335	2.648
3.7879	3.341	2.653
3.8023	3.346	2.659
3.8168	3.351	2.662
3.8314	3.353	2.67
3.8462	3.359	2.678
3.861	3.366	2.685
3.876	3.374	2.689
3.8911	3.38	2.693
3.9063	3.384	2.698
3.9216	3.389	2.704
3.937	3.394	2.71
3.9526	3.4	2.715
3.9683	3.403	2.72
3.9841	3.408	2.728
4.0	3.414	2.735
4.0161	3.421	2.742
4.0323	3.428	2.747
4.0486	3.435	2.752
4.065	3.44	2.756
4.0816	3.445	2.764
4.0984	3.452	2.768
4.1152	3.457	2.776
4.1322	3.465	2.782
4.1494	3.472	2.788
4.1667	3.479	2.79
4.1841	3.483	2.796
4.2017	3.488	2.801
4.2194	3.494	2.807
4.2373	3.497	2.813
4.2553	3.502	2.822
4.2735	3.512	2.829
4.2918	3.519	2.834
4.3103	3.525	2.837
4.329	3.528	2.844
4.3478	3.536	2.853
4.3668	3.544	2.858
4.386	3.55	2.863
4.4053	3.555	2.868
4.4248	3.56	2.875
4.4444	3.566	2.882
4.4643	3.571	2.889
4.4843	3.577	2.896
4.5045	3.584	2.904
4.5249	3.591	2.912
4.5455	3.599	2.918
4.5662	3.606	2.925
4.5872	3.612	2.931
4.6083	3.619	2.939
4.6296	3.627	2.945
4.6512	3.634	2.951
4.6729	3.64	2.957
4.6948	3.645	2.964
4.717	3.651	2.972
4.7393	3.658	2.981
4.7619	3.665	2.989
4.7847	3.672	2.997
4.8077	3.682	3.006
4.8309	3.69	3.012
4.8544	3.698	3.018
4.878	3.707	3.025
4.902	3.714	3.029
4.9261	3.719	3.035
4.9505	3.724	3.041
4.9751	3.726	3.051
5.0	3.732	3.064
5.0251	3.741	3.077
5.0505	3.753	3.089
5.0761	3.766	3.095
5.102	3.777	3.102
5.1282	3.785	3.107
5.1546	3.793	3.114
5.1813	3.801	3.122
5.2083	3.809	3.13
5.2356	3.819	3.139
5.2632	3.829	3.146
5.291	3.838	3.153
5.3191	3.847	3.16
5.3476	3.856	3.167
5.3763	3.865	3.174
5.4054	3.874	3.181
5.4348	3.882	3.187
5.4645	3.889	3.195
5.4945	3.897	3.204
5.5249	3.906	3.212
5.5556	3.915	3.218
5.5866	3.922	3.226
5.618	3.93	3.234
5.6497	3.938	3.243
5.6818	3.946	3.25
5.7143	3.952	3.26
5.7471	3.962	3.27
5.7803	3.97	3.279
5.814	3.979	3.289
5.848	3.99	3.3
5.8824	4.001	3.309
5.9172	4.012	3.315
5.9524	4.02	3.32
5.988	4.025	3.329
6.0241	4.031	3.339
6.0606	4.039	3.348
6.0976	4.047	3.357
6.135	4.05	3.363
6.1728	4.049	3.374
6.2112	4.037	3.394
6.25	4.042	3.447
6.2893	4.089	3.49
6.3291	4.149	3.493
6.3694	4.182	3.46
6.4103	4.177	3.445
6.4516	4.178	3.448
6.4935	4.181	3.454
6.5359	4.185	3.461
6.5789	4.192	3.473
6.6225	4.203	3.481
6.6667	4.21	3.484
6.7114	4.212	3.49
6.7568	4.212	3.505
6.8027	4.219	3.519
6.8493	4.225	3.534
6.8966	4.234	3.55
6.9444	4.244	3.568
6.993	4.259	3.587
7.0423	4.279	3.599
7.0922	4.296	3.604
7.1429	4.309	3.605
7.1942	4.314	3.609
7.2464	4.32	3.617
7.2993	4.325	3.625
7.3529	4.329	3.633
7.4074	4.331	3.643
7.4627	4.332	3.654
7.5188	4.33	3.67
7.5758	4.332	3.688
7.6336	4.334	3.708
7.6923	4.339	3.726
7.7519	4.339	3.745
7.8125	4.341	3.766
7.874	4.342	3.792
7.9365	4.344	3.819
8.0	4.346	3.85
8.0645	4.353	3.887
8.1301	4.365	3.925
8.1967	4.383	3.963
8.2645	4.407	3.998
8.3333	4.434	4.03
8.4034	4.464	4.054
8.4746	4.491	4.073
8.547	4.512	4.091
8.6207	4.529	4.108
8.6957	4.545	4.129
8.7719	4.557	4.158
8.8496	4.577	4.19
8.9286	4.604	4.218
9.009	4.629	4.241
9.0909	4.646	4.264
9.1743	4.664	4.296
9.2593	4.692	4.336
9.3458	4.726	4.372
9.434	4.773	4.4
9.5238	4.815	4.42
9.6154	4.859	4.436
9.7087	4.901	4.442
9.8039	4.939	4.445
9.901	4.967	4.44
10.0	4.986	4.438
10.101	4.999	4.441
10.2041	5.007	4.451
10.3093	5.018	4.465
10.4167	5.026	4.481
10.5263	5.031	4.506
10.6383	5.044	4.535
10.7527	5.065	4.565
10.8696	5.082	4.59
10.989	5.1	4.618
11.1111	5.121	4.646
11.236	5.142	4.672
11.3636	5.159	4.703
11.4943	5.183	4.739
11.6279	5.213	4.766
11.7647	5.239	4.79
11.9048	5.259	4.813
12.0482	5.279	4.841
12.1951	5.297	4.869
12.3457	5.313	4.904
12.5	5.334	4.941
12.6582	5.356	4.979
12.8205	5.383	5.015
12.987	5.407	5.049
13.1579	5.43	5.084
13.3333	5.45	5.121
13.5135	5.473	5.166
13.6986	5.501	5.205
13.8889	5.524	5.244
14.0845	5.545	5.284
14.2857	5.556	5.33
14.4928	5.575	5.391
14.7059	5.602	5.452
14.9254	5.633	5.514
15.1515	5.674	5.574
15.3846	5.711	5.629
15.625	5.75	5.679
15.873	5.776	5.727
16.129	5.797	5.786
16.3934	5.809	5.848
16.6667	5.819	5.946
16.9492	5.86	6.061
17.2414	5.937	6.166
17.5439	6.02	6.239
17.8571	6.08	6.296
18.1818	6.129	6.368
18.5185	6.187	6.451
18.8679	6.245	6.526
19.2308	6.3	6.603
19.6078	6.343	6.685
20.0	6.384	6.792
20.4082	6.44	6.915
20.8333	6.518	7.048
21.2766	6.616	7.176
21.7391	6.727	7.299
22.2222	6.851	7.403
22.7273	6.97	7.491
23.2558	7.066	7.572
23.8095	7.158	7.667
24.3902	7.237	7.776
25.0	7.32	7.904
25.641	7.418	8.049
26.3158	7.534	8.212
27.027	7.669	8.363
27.7778	7.809	8.512
28.5714	7.942	8.669
29.4118	8.083	8.856
30.303	8.254	9.045
31.25	8.444	9.229
32.2581	8.627	9.409
33.3333	8.812	9.603
34.4828	9.006	9.822
35.7143	9.21	10.068
37.037	9.416	10.344
38.4615	9.671	10.73
40.0	10.09	11.118
41.6667	10.56	11.415
43.4783	10.975	11.68
45.4545	11.46	12.115
47.619	12.169	12.505
50.0	12.951	12.751
52.6316	13.767	12.971
55.5556	14.77	13.212

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