Optical constants

Refractive index of Cu-Zn (Copper-zinc alloy, Brass)

Querry 1985: n,k 0.21–55.6 µm; 90% Cu 10% Zn

Data: tabulated nk
Range: 0.21–55.56 µm
Points: 612
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 0.3618
Extinction coefficient k: 2.82184

Permittivity ε₁: -7.83188
Permittivity ε₂: 2.04188

Absorption coefficient α: 603477 cm⁻¹
Penetration depth δ = λ/(2πk): 33.1413 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -2 µm⁻¹

Group index n_g: 1.537
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

# Cu-Zn (Copper-zinc alloy, Brass): Querry 1985: n,k 0.21–55.6 µm; 90% Cu 10% Zn
cu_zn = ls.fetch_refractiveindex("other", "Cu-Zn", "Querry-Cu90Zn10", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cu_zn.range_nm)  # (210, 55555.6) nm
eps = cu_zn.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_95bed2cab5c2/lightsmith"
cu_zn = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(cu_zn.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (cu-zn/querry-1985-cu90zn10).

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

90% Cu, 10% Zn.

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

Cu-Zn (Copper-zinc alloy, Brass), Querry 1985: n,k 0.21–55.6 µm; 90% Cu 10% Zn: n and k versus wavelength
λ (µm)	n	k
0.21	1.163	1.24
0.22	1.206	1.301
0.23	1.265	1.354
0.24	1.321	1.382
0.25	1.36	1.394
0.26	1.382	1.407
0.27	1.4	1.425
0.28	1.42	1.442
0.29	1.44	1.451
0.3	1.453	1.449
0.31	1.454	1.438
0.32	1.437	1.424
0.33	1.401	1.415
0.34	1.35	1.42
0.35	1.292	1.443
0.36	1.238	1.483
0.37	1.193	1.534
0.38	1.156	1.587
0.39	1.126	1.641
0.4	1.098	1.693
0.41	1.072	1.745
0.42	1.047	1.796
0.43	1.024	1.847
0.44	1.002	1.897
0.45	0.98	1.945
0.46	0.959	1.99
0.47	0.937	2.033
0.48	0.912	2.073
0.49	0.883	2.108
0.5	0.846	2.14
0.51	0.798	2.173
0.52	0.738	2.211
0.53	0.667	2.262
0.54	0.592	2.329
0.55	0.519	2.415
0.56	0.457	2.516
0.57	0.409	2.626
0.58	0.377	2.739
0.59	0.357	2.848
0.6	0.346	2.95
0.61	0.339	3.046
0.62	0.333	3.137
0.63	0.327	3.226
0.64	0.323	3.312
0.65	0.32	3.396
0.66	0.317	3.478
0.67	0.314	3.558
0.68	0.311	3.638
0.69	0.308	3.717
0.7	0.306	3.795
0.71	0.305	3.872
0.72	0.304	3.947
0.73	0.302	4.022
0.74	0.3	4.097
0.75	0.298	4.171
0.76	0.296	4.245
0.77	0.294	4.32
0.78	0.293	4.394
0.79	0.293	4.466
0.8	0.291	4.537
0.81	0.287	4.609
0.82	0.283	4.682
0.83	0.28	4.757
0.84	0.279	4.833
0.85	0.278	4.908
0.86	0.279	4.983
0.87	0.279	5.057
0.88	0.28	5.133
0.89	0.284	5.208
0.9	0.289	5.28
0.91	0.293	5.35
0.92	0.295	5.421
0.93	0.298	5.493
0.94	0.303	5.564
0.95	0.308	5.634
0.96	0.312	5.702
0.97	0.315	5.771
0.98	0.318	5.839
0.99	0.321	5.907
1.0	0.323	5.976
1.01	0.327	6.044
1.02	0.33	6.113
1.03	0.333	6.18
1.04	0.336	6.247
1.05	0.339	6.315
1.06	0.341	6.382
1.07	0.343	6.45
1.08	0.346	6.518
1.09	0.348	6.585
1.1	0.35	6.654
1.11	0.354	6.722
1.12	0.357	6.79
1.13	0.361	6.857
1.14	0.365	6.924
1.15	0.368	6.99
1.16	0.371	7.057
1.17	0.374	7.124
1.18	0.378	7.191
1.19	0.381	7.257
1.2	0.384	7.322
1.21	0.385	7.388
1.22	0.386	7.455
1.23	0.388	7.524
1.24	0.391	7.592
1.25	0.395	7.66
1.26	0.399	7.728
1.27	0.403	7.794
1.28	0.406	7.862
1.29	0.41	7.93
1.3	0.415	7.997
1.31	0.42	8.065
1.32	0.425	8.131
1.33	0.431	8.197
1.34	0.435	8.262
1.35	0.439	8.328
1.36	0.443	8.394
1.37	0.448	8.46
1.38	0.453	8.526
1.39	0.457	8.591
1.4	0.461	8.655
1.41	0.464	8.721
1.42	0.467	8.787
1.43	0.47	8.853
1.44	0.473	8.92
1.45	0.477	8.987
1.46	0.482	9.055
1.47	0.487	9.121
1.48	0.492	9.188
1.49	0.497	9.255
1.5	0.503	9.321
1.51	0.508	9.387
1.52	0.514	9.453
1.53	0.52	9.519
1.54	0.525	9.584
1.55	0.531	9.65
1.56	0.536	9.715
1.57	0.542	9.781
1.58	0.548	9.846
1.59	0.555	9.912
1.6	0.562	9.976
1.61	0.567	10.04
1.62	0.571	10.104
1.63	0.577	10.17
1.64	0.582	10.235
1.65	0.589	10.301
1.66	0.595	10.365
1.67	0.601	10.43
1.68	0.607	10.494
1.69	0.614	10.558
1.7	0.62	10.622
1.71	0.626	10.685
1.72	0.631	10.747
1.73	0.634	10.81
1.74	0.638	10.875
1.75	0.642	10.94
1.76	0.646	11.005
1.77	0.651	11.071
1.78	0.655	11.136
1.79	0.66	11.203
1.8	0.666	11.27
1.81	0.672	11.336
1.82	0.68	11.401
1.83	0.686	11.466
1.84	0.694	11.532
1.85	0.7	11.596
1.86	0.706	11.66
1.87	0.714	11.726
1.88	0.72	11.79
1.89	0.728	11.855
1.9	0.734	11.921
1.91	0.742	11.985
1.92	0.748	12.049
1.93	0.756	12.114
1.94	0.764	12.178
1.95	0.77	12.242
1.96	0.778	12.306
1.97	0.784	12.37
1.98	0.792	12.435
1.99	0.8	12.498
2.0	0.807	12.563
2.01	0.815	12.627
2.02	0.823	12.69
2.03	0.829	12.754
2.04	0.837	12.818
2.05	0.846	12.881
2.06	0.854	12.945
2.07	0.862	13.007
2.08	0.869	13.069
2.09	0.877	13.133
2.1	0.885	13.195
2.11	0.891	13.257
2.12	0.899	13.319
2.13	0.906	13.383
2.14	0.912	13.445
2.15	0.918	13.509
2.16	0.924	13.571
2.17	0.931	13.634
2.18	0.939	13.698
2.19	0.945	13.762
2.2	0.952	13.825
2.21	0.96	13.889
2.22	0.967	13.954
2.23	0.976	14.017
2.24	0.984	14.08
2.25	0.991	14.143
2.26	0.999	14.206
2.27	1.006	14.269
2.28	1.015	14.333
2.29	1.023	14.394
2.3	1.03	14.458
2.31	1.039	14.521
2.32	1.046	14.582
2.33	1.054	14.646
2.34	1.062	14.707
2.35	1.069	14.772
2.36	1.078	14.835
2.37	1.085	14.895
2.38	1.094	14.96
2.39	1.102	15.02
2.4	1.109	15.085
2.41	1.118	15.147
2.42	1.125	15.208
2.43	1.134	15.272
2.44	1.14	15.333
2.45	1.149	15.398
2.46	1.159	15.46
2.47	1.165	15.52
2.48	1.174	15.584
2.49	1.184	15.645
2.5	1.188	15.706
2.5063	1.194	15.747
2.5126	1.199	15.787
2.5189	1.205	15.827
2.5253	1.211	15.866
2.5316	1.216	15.905
2.5381	1.222	15.945
2.5445	1.227	15.985
2.551	1.232	16.025
2.5575	1.237	16.065
2.5641	1.242	16.106
2.5707	1.248	16.147
2.5773	1.253	16.188
2.584	1.259	16.229
2.5907	1.264	16.271
2.5974	1.269	16.312
2.6042	1.275	16.354
2.611	1.28	16.396
2.6178	1.285	16.438
2.6247	1.29	16.481
2.6316	1.296	16.524
2.6385	1.301	16.567
2.6455	1.306	16.611
2.6525	1.312	16.654
2.6596	1.317	16.699
2.6667	1.323	16.743
2.6738	1.329	16.787
2.681	1.334	16.832
2.6882	1.34	16.877
2.6954	1.345	16.923
2.7027	1.351	16.968
2.71	1.357	17.014
2.7174	1.363	17.06
2.7248	1.37	17.107
2.7322	1.376	17.153
2.7397	1.382	17.2
2.7473	1.388	17.247
2.7548	1.395	17.295
2.7624	1.401	17.342
2.7701	1.408	17.39
2.7778	1.414	17.438
2.7855	1.421	17.487
2.7933	1.427	17.536
2.8011	1.434	17.585
2.809	1.441	17.635
2.8169	1.448	17.685
2.8249	1.456	17.735
2.8329	1.464	17.785
2.8409	1.471	17.835
2.849	1.478	17.885
2.8571	1.485	17.936
2.8653	1.494	17.988
2.8736	1.502	18.039
2.8818	1.509	18.09
2.8902	1.516	18.142
2.8986	1.524	18.195
2.907	1.533	18.247
2.9155	1.541	18.3
2.924	1.549	18.353
2.9326	1.557	18.406
2.9412	1.565	18.46
2.9499	1.574	18.515
2.9586	1.583	18.569
2.9674	1.592	18.623
2.9762	1.601	18.677
2.9851	1.609	18.732
2.994	1.618	18.787
3.003	1.626	18.844
3.012	1.636	18.9
3.0211	1.645	18.956
3.0303	1.655	19.012
3.0395	1.663	19.069
3.0488	1.672	19.126
3.0581	1.681	19.185
3.0675	1.691	19.243
3.0769	1.701	19.302
3.0864	1.712	19.36
3.096	1.722	19.419
3.1056	1.732	19.477
3.1153	1.741	19.536
3.125	1.75	19.596
3.1348	1.76	19.657
3.1447	1.771	19.719
3.1546	1.782	19.78
3.1646	1.793	19.841
3.1746	1.804	19.902
3.1847	1.815	19.964
3.1949	1.825	20.026
3.2051	1.835	20.089
3.2154	1.845	20.153
3.2258	1.857	20.217
3.2362	1.869	20.282
3.2468	1.881	20.346
3.2573	1.893	20.411
3.268	1.905	20.476
3.2787	1.917	20.542
3.2895	1.929	20.607
3.3003	1.942	20.673
3.3113	1.954	20.74
3.3223	1.967	20.806
3.3333	1.98	20.873
3.3445	1.993	20.941
3.3557	2.006	21.009
3.367	2.019	21.077
3.3784	2.032	21.145
3.3898	2.046	21.214
3.4014	2.059	21.283
3.413	2.073	21.353
3.4247	2.086	21.423
3.4364	2.1	21.493
3.4483	2.114	21.563
3.4602	2.127	21.633
3.4722	2.14	21.704
3.4843	2.152	21.777
3.4965	2.165	21.851
3.5088	2.18	21.925
3.5211	2.194	21.999
3.5336	2.209	22.073
3.5461	2.224	22.147
3.5587	2.239	22.221
3.5714	2.252	22.296
3.5842	2.266	22.372
3.5971	2.28	22.449
3.6101	2.295	22.527
3.6232	2.31	22.604
3.6364	2.325	22.682
3.6496	2.339	22.761
3.663	2.354	22.841
3.6765	2.37	22.922
3.69	2.387	23.002
3.7037	2.403	23.082
3.7175	2.418	23.162
3.7313	2.433	23.244
3.7453	2.449	23.327
3.7594	2.465	23.411
3.7736	2.481	23.494
3.7879	2.497	23.579
3.8023	2.514	23.665
3.8168	2.531	23.751
3.8314	2.549	23.836
3.8462	2.566	23.923
3.861	2.582	24.01
3.876	2.6	24.098
3.8911	2.618	24.187
3.9063	2.635	24.276
3.9216	2.653	24.366
3.937	2.671	24.458
3.9526	2.689	24.549
3.9683	2.708	24.641
3.9841	2.726	24.734
4.0	2.745	24.828
4.0161	2.764	24.922
4.0323	2.784	25.016
4.0486	2.802	25.112
4.065	2.822	25.209
4.0816	2.843	25.306
4.0984	2.863	25.404
4.1152	2.883	25.503
4.1322	2.904	25.603
4.1494	2.926	25.703
4.1667	2.948	25.803
4.1841	2.969	25.904
4.2017	2.99	26.006
4.2194	3.012	26.109
4.2373	3.034	26.213
4.2553	3.057	26.317
4.2735	3.078	26.423
4.2918	3.102	26.53
4.3103	3.126	26.637
4.329	3.15	26.744
4.3478	3.174	26.852
4.3668	3.197	26.961
4.386	3.222	27.072
4.4053	3.247	27.183
4.4248	3.273	27.294
4.4444	3.298	27.406
4.4643	3.322	27.519
4.4843	3.348	27.633
4.5045	3.374	27.748
4.5249	3.4	27.864
4.5455	3.426	27.981
4.5662	3.453	28.099
4.5872	3.48	28.218
4.6083	3.508	28.337
4.6296	3.534	28.457
4.6512	3.561	28.578
4.6729	3.589	28.701
4.6948	3.617	28.826
4.717	3.646	28.951
4.7393	3.676	29.076
4.7619	3.705	29.201
4.7847	3.734	29.328
4.8077	3.763	29.456
4.8309	3.793	29.584
4.8544	3.822	29.714
4.878	3.851	29.845
4.902	3.879	29.979
4.9261	3.909	30.113
4.9505	3.938	30.249
4.9751	3.969	30.386
5.0	3.999	30.525
5.0251	4.03	30.665
5.0505	4.061	30.806
5.0761	4.094	30.94
5.102	4.125	31.092
5.1282	4.158	31.236
5.1546	4.19	31.382
5.1813	4.223	31.529
5.2083	4.255	31.678
5.2356	4.287	31.829
5.2632	4.32	31.981
5.291	4.353	32.136
5.3191	4.387	32.292
5.3476	4.421	32.45
5.3763	4.456	32.609
5.4054	4.491	32.77
5.4348	4.526	32.932
5.4645	4.561	33.096
5.4945	4.596	33.263
5.5249	4.632	33.433
5.5556	4.67	33.603
5.5866	4.707	33.776
5.618	4.745	33.951
5.6497	4.784	34.129
5.6818	4.824	34.309
5.7143	4.866	34.49
5.7471	4.907	34.672
5.7803	4.95	34.857
5.814	4.993	35.044
5.848	5.037	35.233
5.8824	5.081	35.424
5.9172	5.127	35.617
5.9524	5.173	35.813
5.988	5.219	36.01
6.0241	5.267	36.211
6.0606	5.315	36.415
6.0976	5.367	36.62
6.135	5.419	36.828
6.1728	5.473	37.046
6.2112	5.527	37.247
6.25	5.583	37.46
6.2893	5.638	37.675
6.3291	5.696	37.892
6.3694	5.753	38.112
6.4103	5.812	38.334
6.4516	5.871	38.559
6.4935	5.933	38.787
6.5359	5.996	39.017
6.5789	6.062	39.249
6.6225	6.129	39.481
6.6667	6.194	39.715
6.7114	6.26	39.953
6.7568	6.326	40.194
6.8027	6.395	40.439
6.8493	6.465	40.687
6.8966	6.539	40.935
6.9444	6.613	41.185
6.993	6.686	41.437
7.0423	6.76	41.691
7.0922	6.833	41.951
7.1429	6.909	42.212
7.1942	6.985	42.477
7.2464	7.064	42.744
7.2993	7.142	43.015
7.3529	7.224	43.287
7.4074	7.304	43.561
7.4627	7.384	43.837
7.5188	7.461	44.117
7.5758	7.537	44.405
7.6336	7.615	44.699
7.6923	7.698	44.998
7.7519	7.785	45.297
7.8125	7.869	45.598
7.874	7.952	45.903
7.9365	8.034	46.215
8.0	8.118	46.533
8.0645	8.204	46.857
8.1301	8.292	47.184
8.1967	8.381	47.517
8.2645	8.472	47.852
8.3333	8.56	48.192
8.4034	8.648	48.539
8.4746	8.735	48.896
8.547	8.828	49.259
8.6207	8.922	49.628
8.6957	9.018	50.001
8.7719	9.113	50.381
8.8496	9.21	50.769
8.9286	9.309	51.163
9.009	9.408	51.566
9.0909	9.509	51.978
9.1743	9.613	52.4
9.2593	9.724	52.828
9.3458	9.836	53.261
9.434	9.947	53.703
9.5238	10.061	54.156
9.6154	10.179	54.618
9.7087	10.304	55.088
9.8039	10.431	55.564
9.901	10.557	56.05
10.0	10.687	56.547
10.101	10.821	57.057
10.2041	10.963	57.575
10.3093	11.108	58.101
10.4167	11.256	58.637
10.5263	11.408	59.183
10.6383	11.565	59.74
10.7527	11.725	60.308
10.8696	11.89	60.887
10.989	12.059	61.479
11.1111	12.234	62.085
11.236	12.419	62.7
11.3636	12.608	63.325
11.4943	12.801	63.96
11.6279	12.994	64.612
11.7647	13.2	65.276
11.9048	13.41	65.952
12.0482	13.624	66.639
12.1951	13.84	67.345
12.3457	14.069	68.065
12.5	14.303	68.796
12.6582	14.541	69.537
12.8205	14.773	70.3
12.987	15.015	71.086
13.1579	15.265	71.893
13.3333	15.531	72.716
13.5135	15.802	73.552
13.6986	16.073	74.408
13.8889	16.353	75.284
14.0845	16.634	76.185
14.2857	16.924	77.108
14.4928	17.217	78.06
14.7059	17.522	79.04
14.9254	17.837	80.048
15.1515	18.164	81.082
15.3846	18.502	82.143
15.625	18.85	83.228
15.873	19.199	84.343
16.129	19.551	85.494
16.3934	19.909	86.69
16.6667	20.283	87.927
16.9492	20.672	89.201
17.2414	21.065	90.519
17.5439	21.464	91.39
17.8571	21.877	93.328
18.1818	22.326	94.822
18.5185	22.806	96.361
18.8679	23.303	97.945
19.2308	23.808	99.587
19.6078	24.326	101.304
20.0	24.874	103.095
20.4082	25.449	104.958
20.8333	26.042	106.909
21.2766	26.674	108.956
21.7391	27.347	111.104
22.2222	28.078	113.345
22.7273	28.852	115.685
23.2558	29.678	118.143
23.8095	30.575	120.71
24.3902	31.526	123.394
25.0	32.539	126.209
25.641	33.608	129.195
26.3158	34.79	132.352
27.027	36.09	135.677
27.7778	37.516	139.177
28.5714	39.083	142.859
29.4118	40.803	146.732
30.303	42.69	150.799
31.25	44.74	155.103
32.2581	47.012	159.655
33.3333	49.528	164.461
34.4828	52.313	169.526
35.7143	55.375	174.911
37.037	58.813	180.64
38.4615	62.712	186.684
40.0	67.101	193.002
41.6667	71.968	199.594
43.4783	77.307	206.593
45.4545	83.297	214.045
47.619	90.071	222.012
50.0	97.835	230.346
52.6316	106.633	239.428
55.5556	117.163	248.501

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: —

Cu-Zn (Copper-zinc alloy, Brass): all datasets

About Cu-Zn (Copper-zinc alloy, Brass)

Brass is an alloy primarily composed of copper and zinc, prized for its versatility and attractive gold-like appearance. Its mechanical properties, such as strength and ductility, can be adjusted by varying the copper-to-zinc ratio, making it suitable for a wide range of applications—from musical instruments and decorative pieces to plumbing and marine hardware. Brass is relatively resistant to corrosion and easy to machine, further contributing to its popularity in manufacturing and engineering fields. In decorative contexts, the natural patina that can develop on brass adds to its aesthetic appeal and cultural significance.

More about Cu-Zn (Copper-zinc alloy, Brass) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/other/alloys/Cu-Zn/nk/Querry-Cu90Zn10.yml
ID: ds_95bed2cab5c2
API: /v1/datasets/ds_95bed2cab5c2

Plot