At one wavelength

Refractive index n: 1.58004
Extinction coefficient k: 0.86108

Permittivity ε₁: 1.75507
Permittivity ε₂: 2.72108

Absorption coefficient α: 184150 cm⁻¹
Penetration depth δ = λ/(2πk): 108.607 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: 0.4 µm⁻¹

Group index n_g: 1.345
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 KS-2; n,k 0.21–55.6 µm
c = ls.fetch_refractiveindex("main", "C", "Querry-DixonKS2", 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_6e49f6601ea4/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-dixonks2).

# ... 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 KS-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

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 KS-2; n,k 0.21–55.6 µm: n and k versus wavelength
λ (µm)	n	k
0.21	0.861	0.636
0.22	0.903	0.721
0.23	0.965	0.807
0.24	1.05	0.885
0.25	1.166	0.936
0.26	1.286	0.929
0.27	1.367	0.886
0.28	1.414	0.842
0.29	1.441	0.806
0.3	1.458	0.779
0.31	1.469	0.758
0.32	1.474	0.744
0.33	1.482	0.737
0.34	1.489	0.726
0.35	1.489	0.719
0.36	1.489	0.718
0.37	1.49	0.721
0.38	1.494	0.725
0.39	1.499	0.729
0.4	1.504	0.733
0.41	1.508	0.736
0.42	1.511	0.739
0.43	1.514	0.745
0.44	1.517	0.751
0.45	1.52	0.758
0.46	1.524	0.765
0.47	1.528	0.773
0.48	1.532	0.782
0.49	1.539	0.79
0.5	1.544	0.796
0.51	1.549	0.802
0.52	1.553	0.809
0.53	1.558	0.816
0.54	1.562	0.823
0.55	1.566	0.831
0.56	1.569	0.838
0.57	1.572	0.846
0.58	1.577	0.855
0.59	1.581	0.863
0.6	1.585	0.87
0.61	1.589	0.878
0.62	1.593	0.887
0.63	1.597	0.895
0.64	1.602	0.905
0.65	1.607	0.912
0.66	1.61	0.919
0.67	1.612	0.928
0.68	1.616	0.938
0.69	1.621	0.947
0.7	1.625	0.956
0.71	1.63	0.965
0.72	1.634	0.974
0.73	1.639	0.983
0.74	1.644	0.992
0.75	1.648	1.0
0.76	1.653	1.01
0.77	1.658	1.018
0.78	1.663	1.027
0.79	1.668	1.036
0.8	1.674	1.043
0.81	1.678	1.049
0.82	1.682	1.058
0.83	1.686	1.066
0.84	1.689	1.075
0.85	1.694	1.083
0.86	1.697	1.09
0.87	1.701	1.099
0.88	1.704	1.108
0.89	1.708	1.118
0.9	1.713	1.126
0.91	1.716	1.135
0.92	1.719	1.145
0.93	1.724	1.154
0.94	1.728	1.164
0.95	1.733	1.173
0.96	1.737	1.182
0.97	1.742	1.191
0.98	1.747	1.201
0.99	1.751	1.21
1.0	1.756	1.219
1.01	1.761	1.228
1.02	1.766	1.238
1.03	1.771	1.247
1.04	1.775	1.256
1.05	1.781	1.266
1.06	1.786	1.275
1.07	1.791	1.283
1.08	1.796	1.293
1.09	1.801	1.302
1.1	1.807	1.311
1.11	1.812	1.32
1.12	1.817	1.329
1.13	1.822	1.338
1.14	1.828	1.347
1.15	1.834	1.356
1.16	1.839	1.366
1.17	1.845	1.375
1.18	1.851	1.384
1.19	1.856	1.393
1.2	1.864	1.403
1.21	1.87	1.41
1.22	1.876	1.419
1.23	1.883	1.427
1.24	1.888	1.435
1.25	1.895	1.444
1.26	1.901	1.452
1.27	1.907	1.46
1.28	1.914	1.469
1.29	1.92	1.476
1.3	1.926	1.484
1.31	1.933	1.493
1.32	1.939	1.5
1.33	1.945	1.508
1.34	1.952	1.516
1.35	1.959	1.524
1.36	1.965	1.531
1.37	1.971	1.539
1.38	1.978	1.547
1.39	1.985	1.554
1.4	1.991	1.561
1.41	1.997	1.568
1.42	2.004	1.575
1.43	2.01	1.583
1.44	2.016	1.59
1.45	2.023	1.597
1.46	2.029	1.604
1.47	2.036	1.611
1.48	2.042	1.619
1.49	2.048	1.625
1.5	2.054	1.632
1.51	2.062	1.64
1.52	2.068	1.647
1.53	2.076	1.653
1.54	2.081	1.659
1.55	2.088	1.667
1.56	2.095	1.673
1.57	2.102	1.68
1.58	2.108	1.685
1.59	2.113	1.692
1.6	2.12	1.698
1.61	2.127	1.705
1.62	2.134	1.711
1.63	2.141	1.717
1.64	2.146	1.723
1.65	2.153	1.729
1.66	2.16	1.735
1.67	2.166	1.741
1.68	2.172	1.747
1.69	2.178	1.754
1.7	2.185	1.76
1.71	2.191	1.765
1.72	2.198	1.771
1.73	2.204	1.777
1.74	2.211	1.784
1.75	2.218	1.789
1.76	2.224	1.795
1.77	2.231	1.801
1.78	2.238	1.807
1.79	2.246	1.812
1.8	2.253	1.817
1.81	2.26	1.82
1.82	2.265	1.825
1.83	2.271	1.831
1.84	2.279	1.836
1.85	2.286	1.84
1.86	2.293	1.843
1.87	2.297	1.847
1.88	2.302	1.851
1.89	2.307	1.857
1.9	2.314	1.862
1.91	2.319	1.867
1.92	2.325	1.872
1.93	2.331	1.876
1.94	2.337	1.881
1.95	2.343	1.885
1.96	2.349	1.89
1.97	2.354	1.895
1.98	2.361	1.899
1.99	2.366	1.904
2.0	2.374	1.909
2.01	2.38	1.911
2.02	2.384	1.915
2.03	2.389	1.92
2.04	2.395	1.924
2.05	2.4	1.928
2.06	2.406	1.932
2.07	2.411	1.936
2.08	2.417	1.94
2.09	2.423	1.944
2.1	2.428	1.947
2.11	2.433	1.951
2.12	2.438	1.955
2.13	2.442	1.958
2.14	2.447	1.962
2.15	2.452	1.965
2.16	2.456	1.969
2.17	2.46	1.973
2.18	2.465	1.977
2.19	2.469	1.981
2.2	2.473	1.985
2.21	2.477	1.989
2.22	2.482	1.994
2.23	2.486	1.998
2.24	2.491	2.003
2.25	2.496	2.007
2.26	2.5	2.009
2.27	2.503	2.014
2.28	2.506	2.018
2.29	2.51	2.023
2.3	2.515	2.028
2.31	2.519	2.032
2.32	2.523	2.037
2.33	2.527	2.042
2.34	2.531	2.046
2.35	2.535	2.051
2.36	2.539	2.055
2.37	2.544	2.061
2.38	2.548	2.065
2.39	2.553	2.07
2.4	2.557	2.074
2.41	2.561	2.076
2.42	2.565	2.083
2.43	2.57	2.088
2.44	2.574	2.092
2.45	2.577	2.096
2.46	2.58	2.1
2.47	2.581	2.107
2.48	2.587	2.115
2.49	2.592	2.12
2.5	2.597	2.127
2.5063	2.602	2.132
2.5126	2.608	2.132
2.5189	2.609	2.133
2.5253	2.612	2.137
2.5316	2.615	2.14
2.5381	2.618	2.143
2.5445	2.62	2.145
2.551	2.623	2.15
2.5575	2.627	2.153
2.5641	2.63	2.155
2.5707	2.634	2.158
2.5773	2.638	2.16
2.584	2.639	2.162
2.5907	2.642	2.165
2.5974	2.644	2.17
2.6042	2.648	2.172
2.611	2.651	2.175
2.6178	2.653	2.179
2.6247	2.657	2.184
2.6316	2.662	2.186
2.6385	2.664	2.187
2.6455	2.667	2.193
2.6525	2.673	2.195
2.6596	2.673	2.197
2.6667	2.677	2.202
2.6738	2.681	2.202
2.681	2.682	2.205
2.6882	2.684	2.212
2.6954	2.691	2.215
2.7027	2.692	2.216
2.71	2.694	2.22
2.7174	2.698	2.226
2.7248	2.703	2.227
2.7322	2.704	2.233
2.7397	2.711	2.236
2.7473	2.712	2.239
2.7548	2.716	2.242
2.7624	2.719	2.246
2.7701	2.724	2.25
2.7778	2.726	2.252
2.7855	2.729	2.258
2.7933	2.733	2.262
2.8011	2.739	2.267
2.809	2.743	2.268
2.8169	2.745	2.272
2.8249	2.75	2.276
2.8329	2.754	2.281
2.8409	2.758	2.283
2.849	2.76	2.287
2.8571	2.767	2.293
2.8653	2.774	2.295
2.8736	2.776	2.297
2.8818	2.779	2.301
2.8902	2.784	2.303
2.8986	2.786	2.307
2.907	2.789	2.312
2.9155	2.794	2.318
2.924	2.8	2.323
2.9326	2.806	2.324
2.9412	2.809	2.328
2.9499	2.814	2.33
2.9586	2.816	2.336
2.9674	2.823	2.339
2.9762	2.827	2.343
2.9851	2.832	2.346
2.994	2.837	2.35
3.003	2.841	2.354
3.012	2.846	2.359
3.0211	2.853	2.36
3.0303	2.855	2.364
3.0395	2.863	2.368
3.0488	2.866	2.369
3.0581	2.871	2.373
3.0675	2.875	2.376
3.0769	2.88	2.38
3.0864	2.884	2.384
3.096	2.891	2.387
3.1056	2.892	2.388
3.1153	2.895	2.395
3.125	2.9	2.399
3.1348	2.909	2.406
3.1447	2.915	2.406
3.1546	2.918	2.409
3.1646	2.922	2.414
3.1746	2.929	2.42
3.1847	2.937	2.422
3.1949	2.942	2.421
3.2051	2.943	2.423
3.2154	2.947	2.43
3.2258	2.956	2.435
3.2362	2.96	2.436
3.2468	2.965	2.44
3.2573	2.971	2.442
3.268	2.974	2.445
3.2787	2.979	2.45
3.2895	2.983	2.453
3.3003	2.991	2.459
3.3113	2.996	2.46
3.3223	3.0	2.464
3.3333	3.007	2.467
3.3445	3.011	2.469
3.3557	3.015	2.474
3.367	3.022	2.477
3.3784	3.027	2.478
3.3898	3.031	2.482
3.4014	3.037	2.486
3.413	3.039	2.488
3.4247	3.045	2.493
3.4364	3.05	2.496
3.4483	3.055	2.501
3.4602	3.061	2.505
3.4722	3.065	2.507
3.4843	3.07	2.511
3.4965	3.076	2.515
3.5088	3.078	2.519
3.5211	3.084	2.527
3.5336	3.092	2.529
3.5461	3.097	2.533
3.5587	3.102	2.538
3.5714	3.108	2.542
3.5842	3.114	2.547
3.5971	3.123	2.55
3.6101	3.127	2.55
3.6232	3.129	2.557
3.6364	3.139	2.561
3.6496	3.143	2.562
3.663	3.148	2.567
3.6765	3.153	2.572
3.69	3.161	2.576
3.7037	3.165	2.579
3.7175	3.171	2.583
3.7313	3.175	2.588
3.7453	3.184	2.593
3.7594	3.187	2.596
3.7736	3.193	2.602
3.7879	3.201	2.606
3.8023	3.208	2.607
3.8168	3.211	2.613
3.8314	3.217	2.62
3.8462	3.225	2.625
3.861	3.231	2.626
3.876	3.238	2.631
3.8911	3.244	2.634
3.9063	3.249	2.639
3.9216	3.254	2.644
3.937	3.261	2.65
3.9526	3.269	2.654
3.9683	3.275	2.658
3.9841	3.283	2.664
4.0	3.289	2.666
4.0161	3.295	2.674
4.0323	3.305	2.679
4.0486	3.311	2.682
4.065	3.318	2.688
4.0816	3.328	2.69
4.0984	3.335	2.694
4.1152	3.343	2.698
4.1322	3.352	2.706
4.1494	3.366	2.708
4.1667	3.376	2.71
4.1841	3.392	2.715
4.2017	3.416	2.701
4.2194	3.417	2.669
4.2373	3.383	2.653
4.2553	3.367	2.678
4.2735	3.368	2.685
4.2918	3.361	2.701
4.3103	3.356	2.72
4.329	3.366	2.746
4.3478	3.379	2.758
4.3668	3.393	2.772
4.386	3.408	2.778
4.4053	3.419	2.782
4.4248	3.427	2.788
4.4444	3.437	2.796
4.4643	3.447	2.801
4.4843	3.456	2.806
4.5045	3.464	2.81
4.5249	3.471	2.817
4.5455	3.482	2.822
4.5662	3.488	2.828
4.5872	3.498	2.837
4.6083	3.506	2.845
4.6296	3.519	2.851
4.6512	3.528	2.853
4.6729	3.537	2.859
4.6948	3.547	2.863
4.717	3.556	2.868
4.7393	3.562	2.872
4.7619	3.57	2.883
4.7847	3.581	2.887
4.8077	3.59	2.894
4.8309	3.604	2.899
4.8544	3.61	2.9
4.878	3.616	2.907
4.902	3.627	2.915
4.9261	3.639	2.921
4.9505	3.648	2.923
4.9751	3.65	2.928
5.0	3.653	2.942
5.0251	3.672	2.959
5.0505	3.691	2.961
5.0761	3.702	2.965
5.102	3.714	2.97
5.1282	3.726	2.974
5.1546	3.738	2.977
5.1813	3.748	2.982
5.2083	3.76	2.988
5.2356	3.773	2.991
5.2632	3.783	2.994
5.291	3.793	3.0
5.3191	3.807	3.003
5.3476	3.817	3.006
5.3763	3.829	3.01
5.4054	3.838	3.01
5.4348	3.846	3.017
5.4645	3.856	3.022
5.4945	3.869	3.028
5.5249	3.882	3.03
5.5556	3.89	3.034
5.5866	3.902	3.04
5.618	3.913	3.04
5.6497	3.922	3.046
5.6818	3.935	3.05
5.7143	3.944	3.051
5.7471	3.946	3.055
5.7803	3.959	3.065
5.814	3.973	3.069
5.848	3.986	3.069
5.8824	3.991	3.071
5.9172	4.001	3.081
5.9524	4.013	3.082
5.988	4.019	3.09
6.0241	4.034	3.095
6.0606	4.04	3.099
6.0976	4.054	3.103
6.135	4.059	3.105
6.1728	4.068	3.113
6.2112	4.073	3.115
6.25	4.069	3.129
6.2893	4.085	3.162
6.3291	4.125	3.171
6.3694	4.145	3.161
6.4103	4.155	3.156
6.4516	4.162	3.154
6.4935	4.162	3.162
6.5359	4.177	3.173
6.5789	4.189	3.174
6.6225	4.198	3.18
6.6667	4.208	3.188
6.7114	4.22	3.194
6.7568	4.234	3.201
6.8027	4.247	3.204
6.8493	4.256	3.207
6.8966	4.264	3.218
6.9444	4.28	3.223
6.993	4.288	3.226
7.0423	4.298	3.235
7.0922	4.313	3.24
7.1429	4.322	3.246
7.1942	4.334	3.255
7.2464	4.345	3.261
7.2993	4.359	3.268
7.3529	4.37	3.273
7.4074	4.382	3.279
7.4627	4.393	3.285
7.5188	4.406	3.291
7.5758	4.412	3.296
7.6336	4.423	3.306
7.6923	4.433	3.314
7.7519	4.443	3.324
7.8125	4.457	3.333
7.874	4.465	3.336
7.9365	4.473	3.352
8.0	4.49	3.361
8.0645	4.494	3.37
8.1301	4.511	3.389
8.1967	4.528	3.391
8.2645	4.533	3.401
8.3333	4.547	3.417
8.4034	4.564	3.427
8.4746	4.576	3.437
8.547	4.588	3.449
8.6207	4.6	3.457
8.6957	4.612	3.474
8.7719	4.634	3.486
8.8496	4.647	3.49
8.9286	4.651	3.501
9.009	4.664	3.523
9.0909	4.684	3.538
9.1743	4.703	3.553
9.2593	4.723	3.558
9.3458	4.729	3.569
9.434	4.745	3.585
9.5238	4.758	3.601
9.6154	4.779	3.62
9.7087	4.798	3.63
9.8039	4.814	3.638
9.901	4.825	3.653
10.0	4.843	3.67
10.101	4.859	3.686
10.2041	4.878	3.7
10.3093	4.892	3.716
10.4167	4.911	3.732
10.5263	4.924	3.749
10.6383	4.948	3.77
10.7527	4.969	3.779
10.8696	4.986	3.794
10.989	5.003	3.807
11.1111	5.019	3.825
11.236	5.035	3.842
11.3636	5.049	3.854
11.4943	5.059	3.888
11.6279	5.099	3.913
11.7647	5.116	3.917
11.9048	5.126	3.933
12.0482	5.14	3.954
12.1951	5.158	3.978
12.3457	5.177	4.001
12.5	5.196	4.026
12.6582	5.211	4.046
12.8205	5.228	4.077
12.987	5.255	4.103
13.1579	5.275	4.125
13.3333	5.291	4.152
13.5135	5.311	4.186
13.6986	5.336	4.211
13.8889	5.352	4.243
14.0845	5.381	4.279
14.2857	5.408	4.301
14.4928	5.422	4.328
14.7059	5.441	4.365
14.9254	5.457	4.405
15.1515	5.48	4.449
15.3846	5.501	4.491
15.625	5.535	4.544
15.873	5.572	4.579
16.129	5.596	4.616
16.3934	5.614	4.664
16.6667	5.652	4.719
16.9492	5.681	4.762
17.2414	5.708	4.813
17.5439	5.738	4.874
17.8571	5.781	4.936
18.1818	5.817	4.984
18.5185	5.848	5.049
18.8679	5.884	5.115
19.2308	5.926	5.193
19.6078	5.981	5.261
20.0	6.023	5.326
20.4082	6.068	5.41
20.8333	6.124	5.49
21.2766	6.182	5.581
21.7391	6.253	5.663
22.2222	6.306	5.748
22.7273	6.372	5.853
23.2558	6.461	5.946
23.8095	6.537	6.033
24.3902	6.611	6.135
25.0	6.69	6.252
25.641	6.783	6.372
26.3158	6.888	6.49
27.027	6.991	6.62
27.7778	7.117	6.754
28.5714	7.242	6.881
29.4118	7.384	7.04
30.303	7.545	7.177
31.25	7.699	7.334
32.2581	7.909	7.502
33.3333	8.146	7.612
34.4828	8.307	7.717
35.7143	8.495	7.897
37.037	8.712	8.068
38.4615	8.938	8.265
40.0	9.22	8.502
41.6667	9.608	8.714
43.4783	9.937	8.853
45.4545	10.256	9.141
47.619	10.808	9.43
50.0	11.393	9.614
52.6316	12.172	9.771
55.5556	12.972	9.768

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