At one wavelength

Refractive index n: 2.93515
Extinction coefficient k: 0.917245

Permittivity ε₁: 7.77377
Permittivity ε₂: 5.3845

Absorption coefficient α: 5145.73 cm⁻¹
Penetration depth δ = λ/(2πk): 3886.72 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.196001 µm⁻¹

Group index n_g: 7.32557
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

# Montmorillonite: Querry 1987: n,k 2.5–200 µm
montmorillonite = ls.fetch_refractiveindex("other", "montmorillonite", "Querry", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(montmorillonite.range_nm)  # (2500, 200000) nm
eps = montmorillonite.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_79ab66f12393/lightsmith"
montmorillonite = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(montmorillonite.source)  # citation and provenance travel with the data

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

# ... load montmorillonite as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=montmorillonite)],
    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

396 rows as published

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

Montmorillonite, Querry 1987: n,k 2.5–200 µm: n and k versus wavelength
λ (µm)	n	k
2.5	1.426	0.0
2.5063	1.426	0.0
2.5126	1.425	0.001
2.5189	1.426	0.004
2.5253	1.427	0.004
2.5316	1.427	0.003
2.5381	1.426	0.004
2.5445	1.426	0.004
2.551	1.426	0.004
2.5575	1.425	0.006
2.5641	1.426	0.006
2.5707	1.425	0.006
2.5773	1.424	0.008
2.584	1.426	0.008
2.5907	1.425	0.007
2.5974	1.425	0.008
2.6042	1.424	0.007
2.611	1.424	0.009
2.6178	1.424	0.009
2.6247	1.424	0.01
2.6316	1.425	0.009
2.6385	1.423	0.009
2.6455	1.425	0.009
2.6525	1.422	0.006
2.6596	1.419	0.009
2.6667	1.422	0.009
2.6738	1.418	0.006
2.681	1.415	0.009
2.6882	1.413	0.008
2.6954	1.408	0.011
2.7027	1.408	0.016
2.71	1.406	0.017
2.7174	1.404	0.022
2.7248	1.403	0.026
2.7322	1.402	0.032
2.7397	1.404	0.04
2.7473	1.412	0.05
2.7548	1.425	0.051
2.7624	1.433	0.047
2.7701	1.438	0.039
2.7778	1.438	0.035
2.7855	1.442	0.031
2.7933	1.438	0.023
2.8011	1.431	0.024
2.809	1.432	0.027
2.8169	1.434	0.025
2.8249	1.431	0.023
2.8329	1.43	0.026
2.8409	1.432	0.024
2.849	1.429	0.023
2.8571	1.429	0.023
2.8653	1.427	0.025
2.8736	1.428	0.027
2.8818	1.43	0.025
2.8902	1.428	0.024
2.8986	1.427	0.024
2.907	1.426	0.025
2.9155	1.426	0.026
2.924	1.425	0.027
2.9326	1.427	0.03
2.9412	1.428	0.026
2.9499	1.425	0.029
2.9586	1.428	0.03
2.9674	1.428	0.028
2.9762	1.427	0.03
2.9851	1.429	0.03
2.994	1.428	0.029
3.003	1.429	0.029
3.012	1.429	0.028
3.0211	1.426	0.028
3.0303	1.426	0.03
3.0395	1.427	0.031
3.0488	1.428	0.031
3.0581	1.428	0.029
3.0675	1.426	0.029
3.0769	1.424	0.032
3.0864	1.427	0.036
3.096	1.431	0.032
3.1056	1.429	0.031
3.1153	1.429	0.03
3.125	1.425	0.031
3.1348	1.427	0.034
3.1447	1.429	0.034
3.1546	1.431	0.033
3.1646	1.429	0.03
3.1746	1.429	0.032
3.1847	1.429	0.03
3.1949	1.427	0.031
3.2051	1.428	0.031
3.2154	1.428	0.031
3.2258	1.427	0.031
3.2362	1.427	0.033
3.2573	1.426	0.032
3.268	1.426	0.032
3.2468	1.428	0.032
3.2787	1.425	0.034
3.2895	1.427	0.034
3.3003	1.426	0.034
3.3113	1.427	0.036
3.3223	1.429	0.035
3.3333	1.429	0.033
3.3445	1.426	0.033
3.3557	1.426	0.035
3.367	1.427	0.034
3.3784	1.427	0.034
3.3898	1.425	0.034
3.4014	1.426	0.036
3.413	1.426	0.035
3.4247	1.427	0.037
3.4364	1.427	0.034
3.4483	1.425	0.037
3.4602	1.428	0.038
3.4722	1.428	0.035
3.4843	1.426	0.035
3.4965	1.426	0.038
3.5088	1.427	0.037
3.5211	1.428	0.038
3.5336	1.429	0.036
3.5461	1.427	0.036
3.5587	1.427	0.037
3.5714	1.429	0.038
3.5842	1.429	0.036
3.5971	1.428	0.036
3.6101	1.429	0.036
3.6232	1.429	0.035
3.6364	1.428	0.036
3.6496	1.431	0.035
3.663	1.427	0.03
3.6765	1.424	0.033
3.69	1.423	0.035
3.7037	1.426	0.039
3.7175	1.429	0.036
3.7313	1.427	0.034
3.7453	1.427	0.035
3.7594	1.428	0.033
3.7736	1.426	0.031
3.7879	1.422	0.032
3.8023	1.422	0.035
3.8168	1.424	0.037
3.8314	1.426	0.036
3.8462	1.425	0.035
3.861	1.426	0.035
3.876	1.426	0.033
3.8911	1.425	0.033
3.9063	1.423	0.032
3.9216	1.423	0.033
3.937	1.422	0.032
3.9526	1.421	0.034
3.9683	1.422	0.034
3.9841	1.421	0.033
4.0	1.422	0.033
4.0161	1.421	0.034
4.0323	1.421	0.033
4.0486	1.42	0.034
4.065	1.422	0.033
4.0816	1.421	0.031
4.0984	1.418	0.032
4.1152	1.419	0.034
4.1322	1.421	0.031
4.1494	1.417	0.028
4.1667	1.414	0.032
4.1841	1.416	0.033
4.2017	1.415	0.033
4.2194	1.416	0.032
4.2373	1.414	0.032
4.2553	1.415	0.033
4.2735	1.415	0.031
4.2918	1.413	0.03
4.3103	1.411	0.031
4.329	1.412	0.031
4.3478	1.409	0.031
4.3668	1.409	0.033
4.386	1.41	0.033
4.4053	1.409	0.031
4.4248	1.406	0.032
4.4444	1.408	0.035
4.4643	1.409	0.031
4.4843	1.405	0.031
4.5045	1.404	0.032
4.5249	1.403	0.033
4.5455	1.404	0.035
4.5662	1.404	0.033
4.5872	1.402	0.034
4.6083	1.403	0.036
4.6296	1.404	0.033
4.6512	1.402	0.032
4.6729	1.4	0.031
4.6948	1.398	0.033
4.717	1.399	0.033
4.7393	1.399	0.032
4.7619	1.397	0.031
4.7847	1.394	0.032
4.8077	1.394	0.033
4.8309	1.393	0.032
4.8544	1.391	0.033
4.878	1.391	0.034
4.902	1.389	0.034
4.9261	1.388	0.035
4.9505	1.388	0.034
4.9751	1.387	0.032
5.0	1.383	0.034
5.0251	1.384	0.036
5.0505	1.382	0.035
5.0761	1.38	0.035
5.102	1.379	0.037
5.1282	1.379	0.038
5.1546	1.378	0.037
5.1813	1.376	0.038
5.2083	1.375	0.038
5.2356	1.374	0.038
5.2632	1.372	0.039
5.291	1.372	0.04
5.3191	1.37	0.04
5.3476	1.37	0.041
5.3763	1.367	0.041
5.4054	1.368	0.042
5.4348	1.367	0.04
5.4645	1.363	0.04
5.4945	1.362	0.042
5.5249	1.361	0.041
5.5556	1.359	0.043
5.5866	1.358	0.041
5.618	1.355	0.042
5.6497	1.352	0.041
5.6818	1.347	0.043
5.7143	1.345	0.046
5.7471	1.341	0.048
5.7803	1.338	0.053
5.814	1.34	0.059
5.848	1.343	0.061
5.8824	1.344	0.064
5.9172	1.352	0.063
5.9524	1.353	0.053
5.988	1.346	0.048
6.0241	1.341	0.048
6.0606	1.337	0.049
6.0976	1.335	0.05
6.135	1.33	0.051
6.1728	1.331	0.054
6.2112	1.329	0.05
6.25	1.325	0.051
6.2893	1.321	0.05
6.3291	1.318	0.05
6.3694	1.313	0.048
6.4103	1.307	0.051
6.4516	1.304	0.051
6.4935	1.297	0.053
6.5359	1.294	0.057
6.5789	1.291	0.058
6.6225	1.287	0.061
6.6667	1.284	0.061
6.7114	1.28	0.063
6.7568	1.276	0.063
6.8027	1.269	0.065
6.8493	1.266	0.072
6.8966	1.266	0.072
6.9444	1.262	0.071
6.993	1.257	0.071
7.0423	1.25	0.071
7.0922	1.246	0.075
7.1429	1.242	0.073
7.1942	1.236	0.072
7.2464	1.227	0.071
7.2993	1.22	0.075
7.3529	1.215	0.07
7.4074	1.199	0.067
7.4627	1.187	0.068
7.5188	1.17	0.069
7.5758	1.155	0.075
7.6336	1.139	0.081
7.6923	1.126	0.089
7.7519	1.112	0.095
7.8125	1.101	0.098
7.874	1.081	0.097
7.9365	1.054	0.104
8.0	1.033	0.113
8.0645	1.005	0.117
8.1301	0.968	0.127
8.1967	0.926	0.144
8.2645	0.88	0.171
8.3333	0.831	0.206
8.4034	0.773	0.256
8.4746	0.724	0.337
8.547	0.7	0.424
8.6207	0.679	0.515
8.6957	0.676	0.629
8.7719	0.711	0.749
8.8496	0.794	0.849
8.9286	0.894	0.864
9.009	0.887	0.826
9.0909	0.793	0.884
9.1743	0.714	1.058
9.2593	0.709	1.342
9.3458	0.892	1.706
9.434	1.337	1.948
9.5238	1.828	1.892
9.6154	2.177	1.665
9.7087	2.4	1.398
9.8039	2.541	1.1
9.901	2.559	0.79
10.0	2.486	0.546
10.101	2.374	0.367
10.2041	2.242	0.248
10.3093	2.212	0.188
10.4167	2.009	0.169
10.5263	1.924	0.169
10.6383	1.859	0.193
10.7527	1.833	0.234
10.8696	1.861	0.25
10.989	1.876	0.199
11.1111	1.829	0.157
11.236	1.793	0.165
11.3636	1.794	0.163
11.4943	1.782	0.128
11.6279	1.744	0.114
11.7647	1.727	0.112
11.9048	1.711	0.093
12.0482	1.677	0.075
12.1951	1.638	0.071
12.3457	1.6	0.086
12.5	1.593	0.115
12.6582	1.602	0.107
12.8205	1.59	0.093
12.987	1.571	0.075
13.1579	1.537	0.062
13.3333	1.502	0.065
13.5135	1.473	0.071
13.6986	1.446	0.077
13.8889	1.419	0.085
14.0845	1.392	0.094
14.2857	1.365	0.105
14.4928	1.341	0.111
14.7059	1.306	0.112
14.9254	1.259	0.122
15.1515	1.208	0.139
15.3846	1.142	0.167
15.625	1.068	0.229
15.873	1.03	0.325
16.129	1.031	0.401
16.3934	1.018	0.451
16.6667	0.983	0.51
16.9492	0.939	0.598
17.2414	0.906	0.723
17.5439	0.907	0.881
17.8571	0.955	1.051
18.1818	1.043	1.23
18.5185	1.213	1.435
18.8679	1.579	1.581
19.2308	2.033	1.305
19.6078	1.903	0.797
20.0	1.436	0.802
20.4082	1.207	1.257
20.8333	1.454	1.872
21.2766	2.286	2.135
21.7391	2.942	1.57
22.2222	2.97	1.032
22.7273	2.871	0.706
23.2558	2.727	0.522
23.8095	2.642	0.412
24.3902	2.538	0.291
25.0	2.412	0.247
25.641	2.331	0.234
26.3158	2.262	0.233
27.027	2.216	0.239
27.7778	2.15	0.247
28.5714	2.117	0.349
29.4118	2.239	0.397
30.303	2.299	0.29
31.25	2.266	0.223
32.2581	2.234	0.197
33.3333	2.221	0.18
34.4828	2.206	0.149
35.7143	2.176	0.126
37.037	2.146	0.117
38.4615	2.124	0.114
40.0	2.103	0.109
41.6667	2.079	0.112
43.4783	2.066	0.126
45.4545	2.065	0.13
47.619	2.052	0.135
50.0	2.053	0.154
52.6316	2.073	0.157
55.5556	2.085	0.139
58.8235	2.076	0.117
62.5	2.047	0.111
66.6667	2.024	0.138
71.4286	2.041	0.176
76.9231	2.079	0.18
83.3333	2.097	0.166
90.9091	2.109	0.156
100.0	2.119	0.152
111.1111	2.151	0.138
125.0	2.151	0.092
142.8571	2.119	0.087
166.6667	2.128	0.114
200.0	2.172	0.1

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