At one wavelength

Refractive index n: 1.90432
Extinction coefficient k: 1.13532

Permittivity ε₁: 2.33748
Permittivity ε₂: 4.32403

Absorption coefficient α: 242799 cm⁻¹
Penetration depth δ = λ/(2πk): 82.3728 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: 0.7 µm⁻¹

Group index n_g: 1.493
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 200-10; n,k 0.21–55.6 µm
c = ls.fetch_refractiveindex("main", "C", "Querry-Dixon200-10", 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_3c2d8b303817/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-dixon200-10).

# ... 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 200-10 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, Dixon 200-10; n,k 0.21–55.6 µm: n and k versus wavelength
λ (µm)	n	k
0.21	0.821	0.82
0.22	0.86	0.937
0.23	0.924	1.065
0.24	1.021	1.194
0.25	1.174	1.298
0.26	1.358	1.323
0.27	1.498	1.276
0.28	1.585	1.215
0.29	1.638	1.162
0.3	1.673	1.119
0.31	1.697	1.083
0.32	1.71	1.057
0.33	1.724	1.042
0.34	1.739	1.023
0.35	1.742	1.009
0.36	1.744	1.004
0.37	1.748	1.004
0.38	1.755	1.007
0.39	1.764	1.009
0.4	1.774	1.012
0.41	1.782	1.013
0.42	1.789	1.015
0.43	1.794	1.019
0.44	1.799	1.024
0.45	1.805	1.031
0.46	1.812	1.039
0.47	1.818	1.046
0.48	1.826	1.056
0.49	1.837	1.065
0.5	1.846	1.07
0.51	1.854	1.076
0.52	1.861	1.082
0.53	1.868	1.089
0.54	1.874	1.096
0.55	1.881	1.103
0.56	1.887	1.11
0.57	1.891	1.12
0.58	1.899	1.13
0.59	1.906	1.137
0.6	1.912	1.146
0.61	1.918	1.154
0.62	1.924	1.163
0.63	1.93	1.173
0.64	1.938	1.184
0.65	1.946	1.191
0.66	1.951	1.196
0.67	1.955	1.208
0.68	1.961	1.219
0.69	1.968	1.23
0.7	1.975	1.24
0.71	1.982	1.25
0.721	1.99	1.26
0.73	1.997	1.27
0.74	2.004	1.28
0.75	2.012	1.29
0.76	2.019	1.3
0.77	2.028	1.31
0.78	2.036	1.319
0.79	2.045	1.329
0.8	2.055	1.334
0.81	2.06	1.341
0.82	2.067	1.349
0.83	2.073	1.357
0.84	2.079	1.365
0.85	2.085	1.373
0.86	2.091	1.38
0.87	2.094	1.387
0.88	2.098	1.398
0.89	2.103	1.408
0.9	2.108	1.418
0.91	2.113	1.429
0.92	2.119	1.441
0.93	2.126	1.451
0.94	2.132	1.462
0.95	2.138	1.473
0.96	2.145	1.483
0.97	2.152	1.494
0.98	2.159	1.504
0.99	2.166	1.514
1.0	2.173	1.525
1.01	2.18	1.535
1.02	2.187	1.545
1.03	2.195	1.556
1.04	2.202	1.566
1.05	2.209	1.576
1.06	2.217	1.587
1.07	2.225	1.596
1.08	2.232	1.607
1.09	2.24	1.617
1.1	2.248	1.627
1.11	2.256	1.637
1.12	2.263	1.647
1.13	2.271	1.656
1.14	2.281	1.668
1.15	2.29	1.678
1.16	2.298	1.687
1.17	2.307	1.697
1.18	2.316	1.706
1.19	2.324	1.716
1.2	2.337	1.724
1.21	2.345	1.729
1.22	2.351	1.739
1.23	2.359	1.748
1.24	2.368	1.757
1.25	2.376	1.766
1.26	2.385	1.775
1.27	2.395	1.783
1.28	2.403	1.792
1.29	2.412	1.8
1.3	2.421	1.808
1.31	2.43	1.817
1.32	2.44	1.825
1.33	2.449	1.833
1.34	2.458	1.841
1.35	2.468	1.848
1.36	2.477	1.855
1.37	2.486	1.862
1.38	2.495	1.869
1.39	2.504	1.876
1.4	2.513	1.882
1.41	2.522	1.889
1.42	2.531	1.896
1.43	2.539	1.902
1.44	2.547	1.909
1.45	2.555	1.916
1.46	2.564	1.923
1.47	2.572	1.93
1.48	2.581	1.937
1.49	2.59	1.944
1.5	2.599	1.95
1.51	2.608	1.956
1.52	2.617	1.962
1.53	2.626	1.967
1.54	2.633	1.973
1.55	2.642	1.98
1.56	2.651	1.986
1.57	2.66	1.992
1.58	2.668	1.996
1.59	2.674	2.003
1.6	2.684	2.01
1.61	2.693	2.015
1.62	2.701	2.02
1.63	2.709	2.026
1.64	2.717	2.031
1.65	2.726	2.037
1.66	2.733	2.043
1.67	2.742	2.049
1.68	2.751	2.054
1.69	2.76	2.059
1.7	2.768	2.064
1.71	2.775	2.069
1.72	2.784	2.074
1.73	2.792	2.08
1.74	2.8	2.085
1.75	2.809	2.09
1.76	2.817	2.095
1.77	2.826	2.1
1.78	2.835	2.105
1.79	2.843	2.109
1.8	2.851	2.115
1.81	2.86	2.12
1.82	2.869	2.125
1.83	2.881	2.133
1.84	2.895	2.133
1.85	2.903	2.131
1.86	2.91	2.13
1.87	2.914	2.131
1.88	2.919	2.136
1.89	2.927	2.139
1.9	2.933	2.142
1.91	2.939	2.146
1.92	2.946	2.149
1.93	2.952	2.153
1.94	2.959	2.157
1.95	2.966	2.16
1.96	2.973	2.163
1.97	2.979	2.166
1.98	2.986	2.17
1.99	2.992	2.175
2.0	3.003	2.176
2.01	3.007	2.174
2.02	3.011	2.179
2.03	3.017	2.182
2.04	3.023	2.186
2.05	3.029	2.189
2.06	3.035	2.191
2.07	3.041	2.194
2.08	3.047	2.197
2.09	3.052	2.199
2.1	3.056	2.202
2.11	3.063	2.204
2.12	3.068	2.207
2.13	3.072	2.21
2.14	3.076	2.213
2.15	3.082	2.216
2.16	3.086	2.219
2.17	3.09	2.223
2.18	3.096	2.226
2.19	3.1	2.229
2.2	3.104	2.233
2.21	3.109	2.237
2.22	3.114	2.24
2.23	3.118	2.244
2.24	3.123	2.247
2.25	3.128	2.25
2.26	3.132	2.253
2.27	3.135	2.257
2.28	3.138	2.261
2.29	3.142	2.266
2.3	3.147	2.27
2.31	3.151	2.274
2.32	3.155	2.279
2.33	3.16	2.283
2.34	3.164	2.288
2.35	3.169	2.292
2.36	3.173	2.296
2.37	3.177	2.302
2.38	3.182	2.306
2.39	3.188	2.311
2.4	3.193	2.314
2.41	3.197	2.318
2.42	3.202	2.322
2.43	3.206	2.326
2.44	3.21	2.331
2.45	3.214	2.335
2.46	3.218	2.339
2.47	3.223	2.344
2.48	3.228	2.348
2.49	3.231	2.352
2.5	3.234	2.358
2.5063	3.238	2.364
2.5126	3.243	2.364
2.5189	3.245	2.367
2.5253	3.249	2.369
2.5316	3.252	2.372
2.5381	3.255	2.375
2.5445	3.255	2.377
2.551	3.259	2.384
2.5575	3.265	2.385
2.5641	3.265	2.388
2.5707	3.27	2.39
2.5773	3.271	2.393
2.584	3.274	2.397
2.5907	3.277	2.401
2.5974	3.281	2.403
2.6042	3.284	2.406
2.611	3.287	2.411
2.6178	3.293	2.414
2.6247	3.293	2.415
2.6316	3.297	2.419
2.6385	3.3	2.421
2.6455	3.303	2.426
2.6525	3.307	2.429
2.6596	3.309	2.433
2.6667	3.312	2.437
2.6738	3.316	2.441
2.681	3.321	2.444
2.6882	3.324	2.45
2.6954	3.331	2.452
2.7027	3.33	2.453
2.71	3.337	2.457
2.7174	3.34	2.461
2.7248	3.346	2.464
2.7322	3.346	2.464
2.7397	3.349	2.473
2.7473	3.354	2.474
2.7548	3.359	2.48
2.7624	3.365	2.482
2.7701	3.368	2.485
2.7778	3.37	2.488
2.7855	3.375	2.493
2.7933	3.38	2.497
2.8011	3.385	2.5
2.809	3.389	2.499
2.8169	3.387	2.505
2.8249	3.396	2.513
2.8329	3.401	2.515
2.8409	3.406	2.517
2.849	3.409	2.521
2.8571	3.415	2.527
2.8653	3.423	2.528
2.8736	3.425	2.526
2.8818	3.426	2.531
2.8902	3.428	2.534
2.8986	3.431	2.543
2.907	3.439	2.548
2.9155	3.443	2.553
2.924	3.452	2.555
2.9326	3.457	2.554
2.9412	3.457	2.557
2.9499	3.462	2.563
2.9586	3.467	2.568
2.9674	3.472	2.571
2.9762	3.477	2.577
2.9851	3.484	2.579
2.994	3.488	2.58
3.003	3.491	2.584
3.012	3.497	2.589
3.0211	3.501	2.591
3.0303	3.505	2.598
3.0395	3.515	2.602
3.0488	3.519	2.6
3.0581	3.522	2.605
3.0675	3.528	2.61
3.0769	3.533	2.614
3.0864	3.538	2.618
3.096	3.543	2.621
3.1056	3.549	2.624
3.1153	3.555	2.626
3.125	3.559	2.629
3.1348	3.564	2.636
3.1447	3.571	2.636
3.1546	3.574	2.64
3.1646	3.582	2.644
3.1746	3.598	2.645
3.1847	3.59	2.649
3.1949	3.597	2.651
3.2051	3.599	2.656
3.2154	3.606	2.658
3.2258	3.609	2.664
3.2362	3.617	2.67
3.2468	3.625	2.67
3.2573	3.629	2.673
3.268	3.636	2.674
3.2787	3.635	2.678
3.2895	3.644	2.684
3.3003	3.648	2.685
3.3113	3.651	2.691
3.3223	3.663	2.697
3.3333	3.668	2.692
3.3445	3.667	2.698
3.3557	3.677	2.704
3.367	3.682	2.707
3.3784	3.69	2.708
3.3898	3.695	2.71
3.4014	3.699	2.711
3.413	3.701	2.714
3.4247	3.704	2.717
3.4364	3.709	2.723
3.4483	3.711	2.728
3.4602	3.717	2.736
3.4722	3.725	2.739
3.4843	3.732	2.742
3.4965	3.736	2.743
3.5088	3.733	2.751
3.5211	3.744	2.762
3.5336	3.755	2.761
3.5461	3.757	2.764
3.5587	3.764	2.771
3.5714	3.768	2.773
3.5842	3.778	2.78
3.5971	3.784	2.779
3.6101	3.786	2.784
3.6232	3.793	2.793
3.6364	3.803	2.795
3.6496	3.808	2.797
3.663	3.81	2.8
3.6765	3.818	2.809
3.69	3.826	2.808
3.7037	3.826	2.814
3.7175	3.834	2.821
3.7313	3.842	2.824
3.7453	3.846	2.829
3.7594	3.854	2.835
3.7736	3.86	2.839
3.7879	3.868	2.843
3.8023	3.876	2.847
3.8168	3.88	2.85
3.8314	3.884	2.856
3.8462	3.893	2.862
3.861	3.9	2.866
3.876	3.906	2.868
3.8911	3.91	2.874
3.9063	3.917	2.88
3.9216	3.925	2.887
3.937	3.932	2.89
3.9526	3.938	2.894
3.9683	3.945	2.89
3.9841	3.951	2.906
4.0	3.96	2.911
4.0161	3.967	2.917
4.0323	3.976	2.92
4.0486	3.98	2.922
4.065	3.986	2.93
4.0816	3.996	2.931
4.0984	4.001	2.937
4.1152	4.004	2.939
4.1322	4.006	2.953
4.1494	4.022	2.956
4.1667	4.023	2.953
4.1841	4.019	2.968
4.2017	4.02	2.989
4.2194	4.035	3.014
4.2373	4.071	3.029
4.2553	4.089	3.017
4.2735	4.096	3.023
4.2918	4.119	3.024
4.3103	4.134	3.014
4.329	4.14	3.008
4.3478	4.142	3.003
4.3668	4.14	3.008
4.386	4.144	3.013
4.4053	4.149	3.021
4.4248	4.156	3.03
4.4444	4.166	3.036
4.4643	4.173	3.038
4.4843	4.181	3.043
4.5045	4.184	3.048
4.5249	4.192	3.061
4.5455	4.208	3.064
4.5662	4.211	3.067
4.5872	4.222	3.079
4.6083	4.232	3.083
4.6296	4.241	3.089
4.6512	4.248	3.093
4.6729	4.256	3.101
4.6948	4.268	3.109
4.717	4.281	3.114
4.7393	4.288	3.116
4.7619	4.297	3.127
4.7847	4.311	3.13
4.8077	4.318	3.135
4.8309	4.33	3.141
4.8544	4.337	3.144
4.878	4.346	3.154
4.902	4.356	3.16
4.9261	4.368	3.166
4.9505	4.376	3.168
4.9751	4.379	3.174
5.0	4.377	3.194
5.0251	4.402	3.221
5.0505	4.43	3.222
5.0761	4.447	3.225
5.102	4.462	3.226
5.1282	4.476	3.231
5.1546	4.491	3.233
5.1813	4.503	3.236
5.2083	4.519	3.241
5.2356	4.536	3.241
5.2632	4.545	3.242
5.291	4.558	3.246
5.3191	4.57	3.25
5.3476	4.586	3.254
5.3763	4.597	3.253
5.4054	4.609	3.258
5.4348	4.623	3.26
5.4645	4.635	3.263
5.4945	4.648	3.263
5.5249	4.657	3.266
5.5556	4.673	3.273
5.5866	4.689	3.269
5.618	4.694	3.27
5.6497	4.707	3.276
5.6818	4.72	3.275
5.7143	4.729	3.277
5.7471	4.741	3.281
5.7803	4.751	3.284
5.814	4.762	3.285
5.848	4.77	3.289
5.8824	4.785	3.294
5.9172	4.794	3.296
5.9524	4.805	3.301
5.988	4.817	3.305
6.0241	4.828	3.306
6.0606	4.838	3.312
6.0976	4.855	3.313
6.135	4.861	3.311
6.1728	4.87	3.317
6.2112	4.872	3.317
6.25	4.867	3.332
6.2893	4.89	3.371
6.3291	4.94	3.372
6.3694	4.954	3.35
6.4103	4.961	3.349
6.4516	4.973	3.345
6.4935	4.978	3.35
6.5359	4.992	3.351
6.5789	4.998	3.352
6.6225	5.008	3.358
6.6667	5.022	3.361
6.7114	5.031	3.361
6.7568	5.041	3.369
6.8027	5.054	3.369
6.8493	5.059	3.374
6.8966	5.072	3.381
6.9444	5.084	3.383
6.993	5.093	3.391
7.0423	5.109	3.395
7.0922	5.121	3.396
7.1429	5.13	3.396
7.1942	5.142	3.401
7.2464	5.149	3.401
7.2993	5.157	3.412
7.3529	5.17	3.417
7.4074	5.181	3.418
7.4627	5.189	3.421
7.5188	5.196	3.425
7.5758	5.202	3.432
7.6336	5.211	3.442
7.6923	5.224	3.449
7.7519	5.24	3.454
7.7519	5.235	3.452
7.874	5.24	3.461
7.9365	5.248	3.477
8.0	5.262	3.486
8.0645	5.263	3.495
8.1301	5.274	3.514
8.1967	5.269	3.524
8.2645	5.295	3.536
8.3333	5.31	3.553
8.4034	5.332	3.572
8.4034	5.327	3.557
8.547	5.347	3.588
8.6207	5.359	3.598
8.6957	5.372	3.611
8.7719	5.392	3.627
8.8496	5.408	3.632
8.9286	5.41	3.645
9.009	5.426	3.664
9.0909	5.444	3.679
9.1743	5.468	3.694
9.2593	5.486	3.696
9.3458	5.493	3.707
9.434	5.51	3.722
9.5238	5.527	3.729
9.6154	5.541	3.741
9.7087	5.554	3.752
9.8039	5.565	3.764
9.901	5.575	3.775
10.0	5.588	3.79
10.101	5.599	3.811
10.2041	5.623	3.827
10.3093	5.634	3.837
10.4167	5.652	3.857
10.5263	5.665	3.869
10.6383	5.681	3.886
10.7527	5.696	3.897
10.8696	5.712	3.915
10.989	5.724	3.927
11.1111	5.734	3.943
11.236	5.744	3.965
11.3636	5.755	3.976
11.4943	5.756	4.02
11.6279	5.803	4.046
11.7647	5.811	4.05
11.9048	5.819	4.075
12.0482	5.839	4.094
12.1951	5.845	4.11
12.3457	5.856	4.148
12.5	5.86	4.178
12.6582	5.895	4.199
12.8205	5.91	4.231
12.987	5.933	4.256
13.1579	5.949	4.283
13.3333	5.968	4.307
13.5135	5.975	4.332
13.6986	5.984	4.37
13.8889	5.998	4.405
14.0845	6.014	4.446
14.2857	6.03	4.479
14.4928	6.037	4.531
14.7059	6.066	4.579
14.9254	6.095	4.623
15.1515	6.116	4.658
15.3846	6.128	4.706
15.625	6.13	4.754
15.873	6.156	4.842
16.129	6.203	4.886
16.3934	6.226	4.949
16.6667	6.274	5.006
16.9492	6.305	5.053
17.2414	6.333	5.118
17.5439	6.374	5.18
17.8571	6.414	5.238
18.1818	6.445	5.295
18.5185	6.478	5.365
18.8679	6.505	5.435
19.2308	6.539	5.52
19.6078	6.589	5.609
20.0	6.643	5.69
20.4082	6.683	5.775
20.8333	6.732	5.872
21.2766	6.794	5.977
21.7391	6.859	6.076
22.2222	6.922	6.178
22.7273	6.981	6.284
23.2558	7.06	6.412
23.8095	7.159	6.526
24.3902	7.239	6.638
25.0	7.329	6.767
25.641	7.429	6.898
26.3158	7.545	7.019
27.027	7.63	7.15
27.7778	7.75	7.316
28.5714	7.873	7.463
29.4118	7.994	7.665
30.303	8.18	7.844
31.25	8.348	8.009
32.2581	8.529	8.184
33.3333	8.716	8.412
34.4828	8.986	8.63
35.7143	9.235	8.818
37.037	9.528	9.076
38.4615	9.838	9.199
40.0	10.114	9.434
41.6667	10.572	9.684
43.4783	10.869	9.764
45.4545	11.242	10.099
47.619	11.724	10.336
50.0	12.265	10.704
52.6316	13.059	10.974
55.5556	14.081	11.173

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