At one wavelength

Refractive index n: 2.36184
Extinction coefficient k: 0.935423

Permittivity ε₁: 4.70327
Permittivity ε₂: 4.41864

Absorption coefficient α: 5247.71 cm⁻¹
Penetration depth δ = λ/(2πk): 3811.19 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.158384 µm⁻¹

Group index n_g: 5.90965
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 0.0553501 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

# Illite: Querry 1987: n,k 2.5–200 µm
illite = ls.fetch_refractiveindex("other", "illite", "Querry", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(illite.range_nm)  # (2500, 200000) nm
eps = illite.eps([22400])  # 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_590529f853ea/lightsmith"
illite = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(illite.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (illite/querry-1987).

# ... load illite as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=illite)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=2500, stop_nm=200000, 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

Pellet.

References

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet, Contractor Report CRDEC-CR-88009 (1987)

Cite

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet, Contractor Report CRDEC-CR-88009 (1987); Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

392 rows as published

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

Illite, Querry 1987: n,k 2.5–200 µm: n and k versus wavelength
λ (µm)	n	k
2.5	1.381	0.004
2.5063	1.381	0.006
2.5126	1.382	0.005
2.5189	1.38	0.007
2.5253	1.383	0.01
2.5316	1.385	0.008
2.5381	1.385	0.007
2.5445	1.385	0.004
2.551	1.381	0.005
2.5575	1.384	0.007
2.5641	1.38	0.004
2.5707	1.381	0.006
2.5773	1.381	0.008
2.584	1.382	0.004
2.5907	1.382	0.007
2.5974	1.381	0.005
2.6042	1.38	0.002
2.611	1.378	0.01
2.6178	1.382	0.002
2.6247	1.381	0.006
2.6316	1.379	0.002
2.6385	1.378	0.005
2.6455	1.378	0.003
2.6525	1.378	0.001
2.6596	1.377	0.002
2.6667	1.379	0.0
2.6738	1.37	0.0
2.681	1.368	0.0
2.6882	1.367	0.0
2.6954	1.36	0.0
2.7027	1.356	0.0
2.71	1.35	0.0
2.7174	1.346	0.005
2.7248	1.34	0.009
2.7322	1.341	0.021
2.7397	1.34	0.023
2.7473	1.342	0.037
2.7548	1.352	0.041
2.7624	1.36	0.046
2.7701	1.367	0.041
2.7778	1.372	0.041
2.7855	1.378	0.034
2.7933	1.376	0.027
2.8011	1.372	0.026
2.809	1.371	0.029
2.8169	1.373	0.027
2.8249	1.37	0.023
2.8329	1.369	0.028
2.8409	1.37	0.024
2.849	1.368	0.028
2.8571	1.369	0.027
2.8653	1.368	0.026
2.8736	1.368	0.027
2.8818	1.367	0.028
2.8902	1.367	0.028
2.8986	1.367	0.028
2.907	1.366	0.029
2.9155	1.366	0.03
2.924	1.366	0.03
2.9326	1.366	0.03
2.9412	1.365	0.031
2.9499	1.365	0.032
2.9586	1.365	0.033
2.9674	1.365	0.033
2.9762	1.365	0.034
2.9851	1.365	0.034
2.994	1.366	0.035
3.003	1.365	0.036
3.012	1.366	0.036
3.0211	1.366	0.037
3.0303	1.366	0.037
3.0395	1.367	0.038
3.0488	1.367	0.039
3.0581	1.367	0.039
3.0675	1.368	0.039
3.0769	1.368	0.04
3.0864	1.368	0.039
3.096	1.368	0.04
3.1056	1.369	0.04
3.1153	1.369	0.04
3.125	1.368	0.04
3.1348	1.368	0.04
3.1447	1.368	0.041
3.1546	1.369	0.041
3.1646	1.369	0.041
3.1746	1.369	0.042
3.1847	1.369	0.042
3.1949	1.369	0.042
3.2051	1.369	0.042
3.2154	1.369	0.042
3.2258	1.369	0.043
3.2362	1.369	0.043
3.2468	1.369	0.043
3.2573	1.369	0.044
3.268	1.369	0.044
3.2787	1.369	0.045
3.2895	1.37	0.044
3.3003	1.37	0.045
3.3113	1.37	0.045
3.3223	1.37	0.045
3.3333	1.37	0.046
3.3445	1.37	0.046
3.3557	1.37	0.046
3.367	1.37	0.046
3.3784	1.37	0.046
3.3898	1.37	0.047
3.4014	1.371	0.047
3.413	1.371	0.047
3.4247	1.371	0.047
3.4364	1.371	0.048
3.4483	1.371	0.048
3.4722	1.371	0.048
3.4843	1.371	0.049
3.4965	1.372	0.049
3.5088	1.372	0.05
3.5211	1.372	0.05
3.5336	1.372	0.05
3.5461	1.373	0.05
3.5587	1.373	0.05
3.5714	1.374	0.05
3.5842	1.374	0.05
3.5971	1.375	0.05
3.6101	1.375	0.049
3.6232	1.375	0.05
3.6364	1.375	0.049
3.6496	1.375	0.049
3.663	1.375	0.049
3.6765	1.375	0.048
3.69	1.375	0.048
3.7037	1.375	0.048
3.7175	1.375	0.048
3.7313	1.375	0.048
3.7453	1.375	0.048
3.7594	1.375	0.047
3.7736	1.375	0.047
3.7879	1.375	0.047
3.8023	1.374	0.047
3.8168	1.374	0.047
3.8314	1.373	0.047
3.8462	1.373	0.047
3.861	1.373	0.047
3.876	1.372	0.047
3.8911	1.372	0.048
3.9063	1.372	0.048
3.937	1.372	0.048
3.9526	1.373	0.043
3.9683	1.373	0.043
3.9841	1.373	0.048
4.0	1.373	0.048
4.0161	1.373	0.048
4.0323	1.373	0.048
4.0486	1.373	0.047
4.065	1.373	0.048
4.0816	1.373	0.046
4.0984	1.373	0.046
4.1152	1.373	0.046
4.1322	1.373	0.046
4.1494	1.372	0.045
4.1667	1.371	0.044
4.1841	1.371	0.044
4.2017	1.371	0.044
4.2194	1.37	0.043
4.2373	1.369	0.044
4.2553	1.369	0.043
4.2735	1.368	0.043
4.2918	1.368	0.044
4.3103	1.367	0.043
4.329	1.367	0.043
4.3478	1.367	0.043
4.3668	1.366	0.043
4.386	1.365	0.043
4.4053	1.365	0.043
4.4248	1.365	0.043
4.4444	1.364	0.043
4.4643	1.363	0.042
4.4843	1.363	0.042
4.5045	1.362	0.042
4.5249	1.362	0.042
4.5455	1.361	0.042
4.5662	1.361	0.042
4.5872	1.36	0.042
4.6083	1.36	0.041
4.6296	1.359	0.041
4.6512	1.359	0.041
4.6729	1.358	0.041
4.6948	1.357	0.04
4.717	1.356	0.04
4.7393	1.355	0.04
4.7619	1.354	0.039
4.7847	1.353	0.039
4.8077	1.352	0.039
4.8309	1.351	0.038
4.8544	1.35	0.038
4.878	1.348	0.038
4.902	1.347	0.038
4.9261	1.345	0.038
4.9505	1.344	0.038
4.9751	1.342	0.038
5.0	1.341	0.039
5.0251	1.34	0.039
5.0505	1.339	0.039
5.0761	1.337	0.04
5.102	1.335	0.04
5.1282	1.334	0.041
5.1546	1.333	0.042
5.1813	1.331	0.042
5.2083	1.33	0.043
5.2356	1.329	0.043
5.2632	1.327	0.044
5.291	1.326	0.045
5.3191	1.325	0.045
5.3476	1.324	0.046
5.3763	1.323	0.046
5.4054	1.322	0.047
5.4348	1.321	0.048
5.4645	1.319	0.048
5.4945	1.319	0.049
5.5249	1.318	0.049
5.5556	1.316	0.049
5.5866	1.315	0.05
5.618	1.314	0.05
5.6497	1.312	0.051
5.6818	1.31	0.051
5.7143	1.309	0.051
5.7471	1.308	0.052
5.7803	1.306	0.052
5.814	1.305	0.053
5.848	1.303	0.053
5.8824	1.302	0.053
5.9172	1.3	0.053
5.9524	1.298	0.054
5.988	1.296	0.054
6.0241	1.294	0.054
6.0606	1.292	0.054
6.0976	1.29	0.054
6.135	1.288	0.054
6.1728	1.285	0.054
6.2112	1.282	0.055
6.25	1.279	0.055
6.2893	1.276	0.056
6.3291	1.273	0.056
6.3694	1.269	0.057
6.4103	1.266	0.058
6.4516	1.262	0.059
6.4935	1.258	0.061
6.5359	1.256	0.063
6.5789	1.252	0.064
6.6225	1.249	0.066
6.6667	1.246	0.068
6.7114	1.244	0.07
6.7568	1.24	0.071
6.8027	1.237	0.072
6.8493	1.235	0.074
6.8966	1.233	0.074
6.9444	1.229	0.075
6.993	1.226	0.075
7.0423	1.222	0.074
7.0922	1.218	0.074
7.1429	1.213	0.073
7.1942	1.208	0.072
7.2464	1.202	0.07
7.2993	1.194	0.068
7.3529	1.185	0.067
7.4074	1.175	0.066
7.4627	1.165	0.067
7.5188	1.154	0.066
7.5758	1.142	0.069
7.6336	1.132	0.07
7.6923	1.116	0.066
7.7519	1.102	0.071
7.8125	1.084	0.068
7.874	1.06	0.068
7.9365	1.035	0.081
8.0	1.017	0.083
8.0645	0.984	0.088
8.1301	0.948	0.1
8.1967	0.91	0.123
8.2645	0.874	0.152
8.3333	0.843	0.187
8.4034	0.808	0.221
8.4746	0.768	0.269
8.547	0.742	0.343
8.6207	0.739	0.381
8.6957	0.684	0.452
8.7719	0.679	0.556
8.8496	0.695	0.646
8.9286	0.717	0.73
9.009	0.744	0.819
9.0909	0.79	0.915
9.1743	0.861	0.997
9.2593	0.924	1.057
9.3458	0.976	1.134
9.434	1.037	1.239
9.5238	1.154	1.392
9.6154	1.4	1.521
9.7087	1.711	1.491
9.8039	1.931	1.348
9.901	2.086	1.195
10.0	2.214	1.016
10.101	2.281	0.807
10.2041	2.288	0.591
10.3093	2.209	0.399
10.4167	2.089	0.28
10.5263	1.969	0.227
10.6383	1.876	0.222
10.7527	1.82	0.239
10.8696	1.803	0.257
10.989	1.82	0.248
11.1111	1.814	0.187
11.236	1.761	0.149
11.3636	1.721	0.136
11.4943	1.684	0.124
11.6279	1.648	0.116
11.7647	1.612	0.113
11.9048	1.576	0.12
12.0482	1.557	0.126
12.1951	1.527	0.114
12.3457	1.451	0.131
12.5	1.451	0.225
12.6582	1.485	0.214
12.8205	1.489	0.245
13.1579	1.493	0.203
13.5135	1.48	0.18
13.6986	1.454	0.174
13.8889	1.431	0.169
14.0845	1.398	0.171
14.2857	1.365	0.196
14.4928	1.372	0.216
14.7059	1.36	0.203
14.9254	1.335	0.199
15.1515	1.298	0.199
15.3846	1.257	0.213
15.625	1.219	0.235
15.873	1.184	0.261
16.129	1.143	0.278
16.3934	1.08	0.313
16.6667	1.014	0.376
16.9492	0.957	0.471
17.2414	0.927	0.59
17.5439	0.924	0.719
17.8571	0.95	0.856
18.1818	1.004	1.0
18.5185	1.125	1.153
18.8679	1.326	1.227
19.2308	1.499	1.176
19.6078	1.54	1.068
20.0	1.46	1.078
20.4082	1.428	1.264
20.8333	1.63	1.549
21.2766	2.119	1.573
21.7391	2.372	1.234
22.2222	2.39	0.984
22.7273	2.31	0.846
23.2558	2.322	0.84
23.8095	2.414	0.729
24.3902	2.376	0.535
25.0	2.245	0.533
25.641	2.298	0.472
26.3158	2.159	0.44
27.027	2.196	0.529
27.7778	2.256	0.477
28.5714	2.291	0.419
29.4118	2.274	0.324
30.303	2.226	0.284
31.25	2.197	0.261
32.2581	2.171	0.233
33.3333	2.134	0.21
34.4828	2.096	0.205
35.7143	2.058	0.21
37.037	2.027	0.256
38.4615	2.079	0.298
40.0	2.132	0.256
41.6667	2.12	0.191
43.4783	2.085	0.169
45.4545	2.057	0.162
47.619	2.034	0.162
50.0	2.001	0.18
52.6316	2.009	0.214
55.5556	2.041	0.201
58.8235	2.018	0.175
62.5	1.995	0.196
66.6667	1.986	0.206
71.4286	1.972	0.234
76.9231	1.993	0.278
83.3333	2.002	0.296
90.9091	2.028	0.395
100.0	2.187	0.409
111.1111	2.313	0.325
125.0	2.352	0.166
142.8571	2.274	0.075
166.6667	2.217	0.061
200.0	2.188	0.066

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