At one wavelength

Refractive index n: 1.8368
Extinction coefficient k: 1.03184

Permittivity ε₁: 2.30914
Permittivity ε₂: 3.79057

Absorption coefficient α: 220669 cm⁻¹
Penetration depth δ = λ/(2πk): 90.6337 nm

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

Group index n_g: 1.543
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, Dixon HPN-2; n,k 0.20–55.6 µm
c = ls.fetch_refractiveindex("main", "C", "Querry-DixonHPN2", 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_2846c1d5f8af/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-dixonhpn2).

# ... 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 Dixon HPN-2 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: Graphite pellet, Dixon HPN-2; n,k 0.20–55.6 µm: n and k versus wavelength
λ (µm)	n	k
0.2	0.84	0.723
0.21	0.9	0.837
0.22	0.962	0.952
0.23	1.045	1.06
0.24	1.162	1.162
0.25	1.326	1.221
0.26	1.49	1.195
0.27	1.591	1.125
0.28	1.646	1.061
0.29	1.679	1.009
0.3	1.697	0.968
0.31	1.706	0.937
0.32	1.71	0.917
0.33	1.718	0.905
0.34	1.724	0.89
0.35	1.721	0.88
0.36	1.72	0.88
0.37	1.722	0.883
0.38	1.727	0.886
0.39	1.733	0.889
0.4	1.739	0.892
0.41	1.743	0.894
0.42	1.746	0.898
0.43	1.749	0.904
0.44	1.752	0.912
0.45	1.756	0.92
0.46	1.761	0.929
0.47	1.767	0.939
0.48	1.775	0.947
0.49	1.782	0.955
0.5	1.788	0.962
0.51	1.794	0.97
0.52	1.801	0.977
0.53	1.807	0.985
0.54	1.812	0.992
0.55	1.817	1.0
0.56	1.821	1.008
0.57	1.827	1.018
0.58	1.833	1.025
0.59	1.838	1.034
0.6	1.842	1.043
0.61	1.847	1.052
0.62	1.852	1.062
0.63	1.857	1.072
0.64	1.864	1.083
0.65	1.87	1.091
0.66	1.874	1.099
0.67	1.878	1.11
0.68	1.884	1.12
0.69	1.889	1.131
0.7	1.895	1.142
0.71	1.902	1.152
0.721	1.909	1.161
0.73	1.915	1.171
0.74	1.921	1.18
0.75	1.926	1.19
0.76	1.932	1.201
0.77	1.939	1.21
0.78	1.945	1.219
0.79	1.952	1.23
0.8	1.96	1.239
0.81	1.964	1.246
0.82	1.969	1.256
0.83	1.974	1.266
0.84	1.98	1.276
0.85	1.987	1.287
0.86	1.995	1.297
0.87	2.001	1.305
0.88	2.006	1.314
0.89	2.012	1.324
0.9	2.017	1.333
0.91	2.023	1.344
0.92	2.029	1.353
0.93	2.035	1.363
0.94	2.042	1.373
0.95	2.048	1.383
0.96	2.055	1.392
0.97	2.061	1.401
0.98	2.067	1.411
0.99	2.073	1.42
1.0	2.078	1.43
1.01	2.084	1.44
1.02	2.09	1.45
1.03	2.096	1.461
1.04	2.103	1.472
1.05	2.11	1.481
1.06	2.116	1.491
1.07	2.124	1.502
1.08	2.132	1.511
1.09	2.138	1.52
1.1	2.145	1.53
1.11	2.152	1.54
1.12	2.158	1.55
1.13	2.166	1.56
1.14	2.174	1.57
1.15	2.182	1.58
1.16	2.189	1.589
1.17	2.197	1.598
1.18	2.205	1.607
1.19	2.214	1.616
1.2	2.218	1.624
1.21	2.225	1.637
1.22	2.234	1.646
1.23	2.242	1.656
1.24	2.252	1.665
1.25	2.26	1.673
1.26	2.269	1.682
1.27	2.277	1.69
1.28	2.286	1.698
1.29	2.294	1.707
1.3	2.303	1.716
1.31	2.312	1.724
1.32	2.32	1.732
1.33	2.329	1.739
1.34	2.338	1.747
1.35	2.347	1.754
1.36	2.355	1.761
1.37	2.363	1.768
1.38	2.371	1.776
1.39	2.379	1.783
1.4	2.387	1.79
1.41	2.395	1.797
1.42	2.403	1.805
1.43	2.411	1.812
1.44	2.42	1.82
1.45	2.428	1.827
1.46	2.436	1.834
1.47	2.445	1.841
1.48	2.455	1.848
1.49	2.463	1.854
1.5	2.472	1.86
1.51	2.481	1.866
1.52	2.49	1.872
1.53	2.498	1.876
1.54	2.505	1.882
1.55	2.513	1.889
1.56	2.522	1.894
1.57	2.53	1.899
1.58	2.536	1.904
1.59	2.543	1.911
1.6	2.551	1.917
1.61	2.559	1.923
1.62	2.567	1.929
1.63	2.575	1.934
1.64	2.582	1.939
1.65	2.59	1.945
1.66	2.597	1.95
1.67	2.605	1.956
1.68	2.612	1.961
1.69	2.62	1.967
1.7	2.627	1.972
1.71	2.635	1.978
1.72	2.642	1.984
1.73	2.65	1.99
1.74	2.658	1.995
1.75	2.666	2.001
1.76	2.675	2.005
1.77	2.681	2.01
1.78	2.688	2.017
1.79	2.697	2.025
1.8	2.708	2.03
1.81	2.719	2.036
1.82	2.732	2.037
1.83	2.74	2.036
1.84	2.747	2.038
1.85	2.753	2.04
1.86	2.76	2.041
1.87	2.765	2.043
1.88	2.77	2.047
1.89	2.776	2.051
1.9	2.782	2.055
1.91	2.788	2.058
1.92	2.793	2.062
1.93	2.8	2.066
1.94	2.806	2.07
1.95	2.812	2.074
1.96	2.819	2.078
1.97	2.825	2.081
1.98	2.831	2.085
1.99	2.839	2.088
2.0	2.842	2.09
2.01	2.847	2.096
2.02	2.855	2.099
2.03	2.86	2.102
2.04	2.866	2.106
2.05	2.873	2.11
2.06	2.878	2.112
2.07	2.884	2.116
2.08	2.89	2.12
2.09	2.896	2.123
2.1	2.902	2.125
2.11	2.906	2.127
2.12	2.911	2.13
2.13	2.916	2.133
2.14	2.921	2.136
2.15	2.925	2.139
2.16	2.929	2.143
2.17	2.934	2.146
2.18	2.939	2.149
2.19	2.942	2.152
2.2	2.946	2.157
2.21	2.951	2.161
2.22	2.955	2.164
2.23	2.96	2.169
2.24	2.965	2.172
2.25	2.97	2.175
2.26	2.973	2.179
2.27	2.977	2.184
2.28	2.981	2.187
2.29	2.985	2.192
2.3	2.989	2.196
2.31	2.994	2.2
2.32	2.998	2.205
2.33	3.003	2.209
2.34	3.007	2.213
2.35	3.011	2.217
2.36	3.016	2.222
2.37	3.02	2.226
2.38	3.025	2.231
2.39	3.03	2.235
2.4	3.034	2.238
2.41	3.038	2.242
2.42	3.042	2.246
2.43	3.046	2.251
2.44	3.05	2.255
2.45	3.055	2.26
2.46	3.059	2.264
2.47	3.063	2.269
2.48	3.068	2.273
2.49	3.072	2.277
2.5	3.075	2.281
2.5063	3.077	2.285
2.5126	3.081	2.289
2.5189	3.083	2.288
2.5253	3.082	2.294
2.5316	3.088	2.297
2.5381	3.092	2.302
2.5445	3.095	2.302
2.551	3.095	2.306
2.5575	3.1	2.311
2.5641	3.104	2.312
2.5707	3.106	2.314
2.5773	3.106	2.318
2.584	3.112	2.322
2.5907	3.113	2.326
2.5974	3.119	2.331
2.6042	3.122	2.331
2.611	3.122	2.333
2.6178	3.124	2.341
2.6247	3.133	2.342
2.6316	3.134	2.341
2.6385	3.136	2.349
2.6455	3.143	2.352
2.6525	3.144	2.351
2.6596	3.145	2.356
2.6667	3.149	2.359
2.6738	3.15	2.363
2.681	3.154	2.368
2.6882	3.159	2.37
2.6954	3.161	2.374
2.7027	3.165	2.38
2.71	3.171	2.381
2.7174	3.173	2.381
2.7248	3.173	2.386
2.7322	3.179	2.395
2.7397	3.182	2.393
2.7473	3.183	2.399
2.7548	3.188	2.403
2.7624	3.192	2.408
2.7701	3.196	2.414
2.7778	3.204	2.416
2.7855	3.208	2.415
2.7933	3.209	2.42
2.8011	3.213	2.424
2.809	3.215	2.424
2.8169	3.216	2.43
2.8249	3.223	2.436
2.8329	3.225	2.438
2.8409	3.23	2.444
2.849	3.235	2.447
2.8571	3.24	2.453
2.8653	3.243	2.453
2.8736	3.246	2.459
2.8818	3.252	2.462
2.8902	3.256	2.468
2.8986	3.261	2.469
2.907	3.264	2.474
2.9155	3.27	2.476
2.924	3.273	2.479
2.9326	3.276	2.484
2.9412	3.282	2.489
2.9499	3.285	2.491
2.9586	3.288	2.497
2.9674	3.294	2.503
2.9762	3.3	2.506
2.9851	3.306	2.509
2.994	3.311	2.51
3.003	3.313	2.514
3.012	3.318	2.522
3.0211	3.326	2.524
3.0303	3.329	2.526
3.0395	3.335	2.531
3.0488	3.338	2.533
3.0581	3.344	2.539
3.0675	3.35	2.538
3.0769	3.35	2.543
3.0864	3.357	2.553
3.096	3.366	2.553
3.1056	3.369	2.553
3.1153	3.37	2.556
3.125	3.373	2.563
3.1348	3.382	2.571
3.1447	3.389	2.571
3.1546	3.393	2.573
3.1646	3.397	2.578
3.1746	3.404	2.581
3.1847	3.405	2.583
3.1949	3.412	2.592
3.2051	3.421	2.594
3.2154	3.424	2.594
3.2258	3.427	2.598
3.2362	3.43	2.604
3.2468	3.437	2.61
3.2573	3.443	2.613
3.268	3.448	2.615
3.2787	3.453	2.622
3.2895	3.46	2.624
3.3003	3.464	2.627
3.3113	3.468	2.635
3.3223	3.481	2.638
3.3333	3.483	2.636
3.3445	3.487	2.64
3.3557	3.491	2.646
3.367	3.5	2.648
3.3784	3.501	2.65
3.3898	3.508	2.658
3.4014	3.515	2.658
3.413	3.519	2.662
3.4247	3.521	2.667
3.4364	3.527	2.676
3.4483	3.536	2.678
3.4602	3.542	2.678
3.4722	3.545	2.683
3.4843	3.552	2.687
3.4965	3.557	2.69
3.5088	3.562	2.695
3.5211	3.567	2.699
3.5336	3.573	2.704
3.5461	3.581	2.709
3.5587	3.584	2.711
3.5714	3.59	2.716
3.5842	3.595	2.717
3.5971	3.598	2.724
3.6101	3.605	2.73
3.6232	3.611	2.735
3.6364	3.62	2.739
3.6496	3.627	2.74
3.663	3.629	2.743
3.6765	3.633	2.752
3.69	3.642	2.757
3.7037	3.647	2.76
3.7175	3.656	2.766
3.7313	3.661	2.768
3.7453	3.67	2.774
3.7594	3.673	2.773
3.7736	3.678	2.762
3.7879	3.684	2.785
3.8023	3.689	2.791
3.8168	3.697	2.794
3.8314	3.702	2.799
3.8462	3.708	2.805
3.861	3.714	2.81
3.876	3.72	2.817
3.8911	3.729	2.82
3.9063	3.736	2.825
3.9216	3.743	2.829
3.937	3.748	2.831
3.9526	3.747	2.838
3.9683	3.757	2.849
3.9841	3.769	2.85
4.0	3.773	2.854
4.0161	3.778	2.862
4.0323	3.788	2.869
4.0486	3.794	2.873
4.065	3.804	2.877
4.0816	3.81	2.881
4.0984	3.818	2.889
4.1152	3.826	2.891
4.1322	3.83	2.891
4.1494	3.832	2.9
4.1667	3.842	2.906
4.1841	3.842	2.91
4.2017	3.844	2.927
4.2194	3.858	2.94
4.2373	3.876	2.948
4.2553	3.889	2.948
4.2735	3.894	2.953
4.2918	3.906	2.962
4.3103	3.923	2.962
4.329	3.931	2.957
4.3478	3.931	2.962
4.3668	3.94	2.969
4.386	3.945	2.971
4.4053	3.951	2.978
4.4248	3.959	2.984
4.4444	3.965	2.989
4.4643	3.971	2.997
4.4843	3.981	3.006
4.5045	3.989	3.012
4.5249	3.999	3.02
4.5455	4.01	3.025
4.5662	4.018	3.03
4.5872	4.027	3.035
4.6083	4.034	3.041
4.6296	4.043	3.048
4.6512	4.053	3.056
4.6729	4.062	3.064
4.6948	4.075	3.072
4.717	4.084	3.075
4.7393	4.092	3.083
4.7619	4.107	3.092
4.7847	4.118	3.095
4.8077	4.127	3.101
4.8309	4.137	3.103
4.8544	4.141	3.113
4.878	4.158	3.124
4.902	4.173	3.122
4.9261	4.177	3.125
4.9505	4.183	3.134
4.9751	4.192	3.142
5.0	4.192	3.154
5.0251	4.211	3.179
5.0505	4.237	3.182
5.0761	4.252	3.186
5.102	4.266	3.191
5.1282	4.284	3.194
5.1546	4.297	3.197
5.1813	4.311	3.2
5.2083	4.323	3.204
5.2356	4.34	3.208
5.2632	4.351	3.208
5.291	4.362	3.214
5.3191	4.378	3.218
5.3476	4.389	3.22
5.3763	4.403	3.223
5.4054	4.414	3.228
5.4348	4.428	3.23
5.4645	4.441	3.234
5.4945	4.452	3.236
5.5249	4.465	3.239
5.5556	4.478	3.242
5.5866	4.49	3.244
5.618	4.501	3.248
5.6497	4.512	3.255
5.6818	4.529	3.256
5.7143	4.536	3.254
5.7471	4.549	3.265
5.7803	4.565	3.266
5.814	4.575	3.265
5.848	4.585	3.268
5.8824	4.597	3.271
5.9172	4.608	3.275
5.9524	4.62	3.28
5.988	4.634	3.284
6.0241	4.646	3.287
6.0606	4.657	3.288
6.0976	4.669	3.291
6.135	4.679	3.293
6.1728	4.688	3.294
6.2112	4.691	3.301
6.25	4.693	3.312
6.2893	4.713	3.347
6.3291	4.764	3.343
6.3694	4.777	3.323
6.4103	4.78	3.316
6.4516	4.78	3.322
6.4935	4.797	3.329
6.5359	4.812	3.327
6.5789	4.822	3.33
6.6225	4.831	3.33
6.6667	4.838	3.333
6.7114	4.85	3.339
6.7568	4.863	3.341
6.8027	4.873	3.345
6.8493	4.882	3.345
6.8966	4.889	3.351
6.9444	4.899	3.357
6.993	4.911	3.365
7.0423	4.922	3.369
7.0922	4.934	3.376
7.1429	4.948	3.375
7.1942	4.955	3.38
7.2464	4.964	3.389
7.2993	4.978	3.392
7.3529	4.983	3.396
7.4074	4.998	3.407
7.4627	5.011	3.409
7.5188	5.02	3.414
7.5758	5.03	3.419
7.6336	5.039	3.425
7.6923	5.047	3.431
7.7519	5.058	3.44
7.8125	5.068	3.442
7.874	5.073	3.453
7.9365	5.08	3.464
8.0	5.094	3.479
8.0645	5.113	3.486
8.1301	5.12	3.489
8.1967	5.127	3.504
8.2645	5.144	3.515
8.3333	5.155	3.525
8.4034	5.17	3.536
8.4746	5.181	3.542
8.547	5.194	3.552
8.6207	5.207	3.565
8.6957	5.222	3.571
8.7719	5.231	3.58
8.8496	5.246	3.59
8.9286	5.252	3.598
9.009	5.26	3.62
9.0909	5.283	3.635
9.1743	5.296	3.641
9.2593	5.309	3.653
9.3458	5.325	3.665
9.434	5.34	3.675
9.5238	5.353	3.686
9.6154	5.364	3.694
9.7087	5.374	3.712
9.8039	5.388	3.727
9.901	5.401	3.744
10.0	5.42	3.759
10.101	5.44	3.774
10.2041	5.458	3.776
10.3093	5.458	3.79
10.4167	5.474	3.809
10.5263	5.489	3.825
10.6383	5.506	3.842
10.7527	5.523	3.855
10.8696	5.532	3.865
10.989	5.54	3.882
11.1111	5.549	3.903
11.236	5.561	3.927
11.3636	5.572	3.934
11.4943	5.571	3.979
11.6279	5.616	4.009
11.7647	5.627	4.015
11.9048	5.638	4.037
12.0482	5.652	4.062
12.1951	5.661	4.088
12.3457	5.677	4.124
12.5	5.706	4.153
12.6582	5.726	4.168
12.8205	5.738	4.198
12.987	5.761	4.225
13.1579	5.777	4.25
13.3333	5.791	4.277
13.5135	5.808	4.308
13.6986	5.825	4.336
13.8889	5.839	4.368
14.0845	5.85	4.404
14.2857	5.863	4.445
14.4928	5.877	4.493
14.7059	5.904	4.541
14.9254	5.935	4.574
15.1515	5.952	4.613
15.3846	5.971	4.657
15.625	5.972	4.705
15.873	5.996	4.784
16.129	6.042	4.833
16.3934	6.071	4.885
16.6667	6.101	4.938
16.9492	6.129	5.001
17.2414	6.167	5.055
17.5439	6.202	5.115
17.8571	6.238	5.173
18.1818	6.271	5.239
18.5185	6.307	5.303
18.8679	6.34	5.365
19.2308	6.367	5.434
19.6078	6.398	5.524
20.0	6.438	5.606
20.4082	6.46	5.702
20.8333	6.511	5.823
21.2766	6.582	5.922
21.7391	6.629	6.02
22.2222	6.686	6.149
22.7273	6.777	6.281
23.2558	6.867	6.393
23.8095	6.95	6.519
24.3902	7.053	6.645
25.0	7.154	6.755
25.641	7.247	6.89
26.3158	7.363	7.023
27.027	7.469	7.165
27.7778	7.602	7.307
28.5714	7.709	7.462
29.4118	7.83	7.675
30.303	8.035	7.891
31.25	8.224	8.052
32.2581	8.425	8.269
33.3333	8.682	8.482
34.4828	8.969	8.664
35.7143	9.225	8.868
37.037	9.586	9.1
38.4615	9.984	9.171
40.0	10.214	9.368
41.6667	10.813	9.559
43.4783	10.952	9.451
45.4545	11.266	9.974
47.619	11.898	10.13
50.0	12.39	10.524
52.6316	13.618	10.803
55.5556	14.474	10.332

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