Optical constants

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

Querry 1985: n,k 0.21–55.6 µm; 70% Cu 30% Zn

Data: tabulated nk
Range: 0.21–55.56 µm
Points: 611
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 0.46192
Extinction coefficient k: 3.135

Permittivity ε₁: -9.61485
Permittivity ε₂: 2.89624

Absorption coefficient α: 670449 cm⁻¹
Penetration depth δ = λ/(2πk): 29.8308 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.8 µm⁻¹

Group index n_g: 0.932
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; 70% Cu 30% Zn
cu_zn = ls.fetch_refractiveindex("other", "Cu-Zn", "Querry-Cu70Zn30", 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_80c5f733b8ef/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-cu70zn30).

# ... 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

70% Cu, 30% 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

611 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; 70% Cu 30% Zn: n and k versus wavelength
λ (µm)	n	k
0.21	1.14	1.314
0.22	1.179	1.381
0.23	1.227	1.442
0.24	1.271	1.482
0.25	1.301	1.512
0.26	1.315	1.544
0.27	1.323	1.586
0.28	1.336	1.637
0.29	1.358	1.688
0.3	1.388	1.731
0.31	1.419	1.764
0.32	1.446	1.789
0.33	1.473	1.807
0.34	1.494	1.815
0.35	1.504	1.815
0.36	1.503	1.815
0.37	1.497	1.818
0.38	1.487	1.818
0.39	1.471	1.813
0.4	1.445	1.805
0.41	1.405	1.794
0.42	1.35	1.786
0.43	1.278	1.784
0.44	1.191	1.797
0.45	1.094	1.829
0.46	0.994	1.883
0.47	0.9	1.957
0.48	0.816	2.046
0.49	0.745	2.145
0.5	0.686	2.25
0.51	0.639	2.358
0.52	0.602	2.464
0.53	0.573	2.568
0.54	0.549	2.668
0.55	0.527	2.765
0.56	0.505	2.86
0.57	0.484	2.958
0.58	0.468	3.059
0.59	0.46	3.159
0.6	0.45	3.253
0.61	0.452	3.345
0.62	0.449	3.434
0.63	0.445	3.522
0.64	0.444	3.609
0.65	0.444	3.695
0.66	0.445	3.778
0.67	0.444	3.86
0.68	0.444	3.943
0.69	0.445	4.025
0.7	0.446	4.106
0.71	0.448	4.186
0.72	0.45	4.266
0.73	0.452	4.346
0.74	0.455	4.424
0.75	0.457	4.501
0.76	0.458	4.579
0.77	0.46	4.657
0.78	0.464	4.737
0.79	0.469	4.814
0.8	0.473	4.89
0.81	0.478	4.965
0.82	0.481	5.039
0.83	0.483	5.115
0.84	0.486	5.192
0.85	0.49	5.269
0.86	0.494	5.346
0.87	0.5	5.423
0.88	0.507	5.5
0.89	0.515	5.575
0.9	0.523	5.65
0.91	0.531	5.724
0.92	0.538	5.797
0.93	0.546	5.87
0.94	0.555	5.944
0.95	0.563	6.016
0.96	0.572	6.087
0.97	0.58	6.158
0.98	0.588	6.228
0.99	0.596	6.298
1.0	0.603	6.367
1.01	0.61	6.437
1.02	0.616	6.507
1.03	0.622	6.578
1.04	0.628	6.649
1.05	0.635	6.72
1.06	0.642	6.792
1.07	0.65	6.862
1.08	0.658	6.933
1.09	0.667	7.004
1.1	0.675	7.074
1.11	0.684	7.144
1.12	0.693	7.214
1.13	0.702	7.283
1.14	0.711	7.351
1.15	0.718	7.419
1.16	0.726	7.487
1.17	0.733	7.557
1.18	0.743	7.627
1.19	0.752	7.694
1.2	0.761	7.76
1.21	0.766	7.826
1.22	0.77	7.895
1.23	0.775	7.967
1.24	0.783	8.04
1.25	0.793	8.112
1.26	0.803	8.182
1.27	0.813	8.251
1.28	0.823	8.32
1.29	0.834	8.39
1.3	0.844	8.459
1.31	0.856	8.528
1.32	0.867	8.595
1.33	0.878	8.662
1.34	0.888	8.728
1.35	0.898	8.795
1.36	0.908	8.861
1.37	0.917	8.928
1.38	0.926	8.994
1.39	0.934	9.061
1.4	0.942	9.128
1.41	0.95	9.196
1.42	0.958	9.265
1.43	0.968	9.335
1.44	0.978	9.405
1.45	0.989	9.474
1.46	1.001	9.542
1.47	1.013	9.609
1.48	1.024	9.675
1.49	1.034	9.742
1.5	1.044	9.81
1.51	1.055	9.878
1.52	1.067	9.946
1.53	1.079	10.014
1.54	1.091	10.08
1.55	1.102	10.146
1.56	1.113	10.213
1.57	1.124	10.28
1.58	1.135	10.347
1.59	1.146	10.415
1.6	1.158	10.483
1.61	1.171	10.552
1.62	1.184	10.619
1.63	1.199	10.686
1.64	1.214	10.751
1.65	1.228	10.814
1.66	1.24	10.879
1.67	1.252	10.943
1.68	1.264	11.008
1.69	1.276	11.073
1.7	1.288	11.138
1.71	1.302	11.203
1.72	1.315	11.266
1.73	1.326	11.328
1.74	1.335	11.39
1.75	1.342	11.456
1.76	1.35	11.523
1.77	1.36	11.593
1.78	1.372	11.662
1.79	1.386	11.73
1.8	1.398	11.796
1.81	1.41	11.863
1.83	1.437	12.0
1.84	1.452	12.068
1.85	1.468	12.135
1.86	1.484	12.202
1.87	1.5	12.267
1.88	1.517	12.332
1.89	1.532	12.396
1.9	1.547	12.459
1.91	1.562	12.524
1.92	1.576	12.588
1.93	1.591	12.654
1.94	1.604	12.718
1.95	1.618	12.786
1.96	1.633	12.855
1.97	1.654	12.922
1.98	1.676	12.986
1.99	1.696	13.044
2.0	1.711	13.101
2.01	1.723	13.161
2.02	1.733	13.226
2.03	1.748	13.295
2.04	1.767	13.363
2.05	1.789	13.426
2.06	1.809	13.485
2.07	1.826	13.545
2.08	1.842	13.607
2.09	1.861	13.666
2.1	1.878	13.725
2.11	1.894	13.784
2.12	1.91	13.842
2.13	1.924	13.902
2.14	1.938	13.961
2.15	1.95	14.023
2.16	1.967	14.084
2.17	1.983	14.146
2.18	1.999	14.206
2.19	2.014	14.265
2.2	2.028	14.324
2.21	2.042	14.385
2.22	2.057	14.447
2.23	2.073	14.511
2.24	2.093	14.57
2.25	2.11	14.628
2.26	2.127	14.686
2.27	2.144	14.743
2.28	2.159	14.797
2.29	2.171	14.853
2.3	2.182	14.909
2.31	2.193	14.966
2.32	2.201	15.026
2.33	2.211	15.087
2.34	2.22	15.151
2.35	2.232	15.217
2.36	2.248	15.283
2.37	2.266	15.35
2.38	2.287	15.411
2.39	2.306	15.466
2.4	2.324	15.522
2.41	2.337	15.578
2.42	2.349	15.636
2.43	2.363	15.697
2.44	2.377	15.755
2.45	2.391	15.813
2.46	2.403	15.872
2.47	2.415	15.932
2.48	2.427	15.995
2.49	2.443	16.055
2.5	2.456	16.114
2.5063	2.467	16.153
2.5126	2.476	16.192
2.5189	2.487	16.23
2.5253	2.497	16.268
2.5316	2.507	16.306
2.5381	2.517	16.343
2.5445	2.527	16.381
2.551	2.537	16.419
2.5575	2.546	16.457
2.5641	2.556	16.495
2.5707	2.565	16.533
2.5773	2.574	16.571
2.584	2.582	16.61
2.5907	2.591	16.649
2.5974	2.6	16.689
2.6042	2.609	16.729
2.611	2.618	16.77
2.6178	2.627	16.81
2.6247	2.636	16.851
2.6316	2.645	16.892
2.6385	2.654	16.934
2.6455	2.663	16.975
2.6525	2.672	17.017
2.6596	2.681	17.059
2.6667	2.69	17.103
2.6738	2.699	17.146
2.681	2.709	17.19
2.6882	2.718	17.234
2.6954	2.728	17.278
2.7027	2.738	17.323
2.71	2.748	17.368
2.7174	2.758	17.413
2.7248	2.769	17.458
2.7322	2.78	17.504
2.7397	2.79	17.551
2.7473	2.802	17.597
2.7548	2.813	17.644
2.7624	2.826	17.691
2.7701	2.837	17.737
2.7778	2.849	17.784
2.7855	2.861	17.832
2.7933	2.874	17.879
2.8011	2.886	17.927
2.809	2.898	17.974
2.8169	2.911	18.023
2.8249	2.924	18.072
2.8329	2.937	18.12
2.8409	2.95	18.169
2.849	2.963	18.218
2.8571	2.977	18.268
2.8653	2.99	18.318
2.8736	3.004	18.368
2.8818	3.018	18.418
2.8902	3.033	18.468
2.8986	3.047	18.518
2.907	3.062	18.568
2.9155	3.077	18.619
2.924	3.091	18.669
2.9326	3.105	18.72
2.9412	3.119	18.772
2.9499	3.134	18.824
2.9586	3.149	18.877
2.9674	3.165	18.929
2.9762	3.18	18.981
2.9851	3.196	19.034
2.994	3.211	19.087
3.003	3.227	19.14
3.012	3.242	19.193
3.0211	3.258	19.248
3.0303	3.274	19.302
3.0395	3.291	19.356
3.0488	3.307	19.41
3.0581	3.323	19.466
3.0675	3.339	19.521
3.0769	3.356	19.517
3.0864	3.373	19.633
3.096	3.39	19.69
3.1056	3.408	19.746
3.1153	3.426	19.803
3.125	3.444	19.86
3.1348	3.462	19.917
3.1447	3.48	19.974
3.1546	3.498	20.032
3.1646	3.516	20.09
3.1746	3.535	20.148
3.1847	3.553	20.207
3.1949	3.571	20.266
3.2051	3.591	20.326
3.2154	3.61	20.386
3.2258	3.63	20.445
3.2362	3.65	20.505
3.2468	3.67	20.565
3.2573	3.69	20.625
3.268	3.71	20.685
3.2787	3.73	20.746
3.2895	3.75	20.808
3.3003	3.77	20.87
3.3113	3.791	20.931
3.3223	3.812	20.993
3.3333	3.832	21.055
3.3445	3.852	21.118
3.3557	3.873	21.181
3.367	3.893	21.244
3.3784	3.915	21.308
3.3898	3.935	21.372
3.4014	3.957	21.436
3.413	3.978	21.501
3.4247	3.999	21.566
3.4364	4.02	21.631
3.4483	4.041	21.698
3.4602	4.062	21.765
3.4722	4.083	21.832
3.4843	4.105	21.9
3.4965	4.127	21.968
3.5088	4.149	22.037
3.5211	4.171	22.106
3.5336	4.194	22.176
3.5461	4.216	22.246
3.5587	4.238	22.317
3.5714	4.261	22.39
3.5842	4.285	22.462
3.5971	4.31	22.534
3.6101	4.335	22.606
3.6232	4.359	22.679
3.6364	4.383	22.753
3.6496	4.409	22.828
3.663	4.434	22.902
3.6765	4.461	22.977
3.69	4.487	23.051
3.7037	4.513	23.126
3.7175	4.538	23.202
3.7313	4.564	23.279
3.7453	4.571	23.356
3.7594	4.618	23.433
3.7736	4.646	23.511
3.7879	4.672	23.589
3.8023	4.7	23.668
3.8168	4.728	23.748
3.8314	4.756	23.827
3.8462	4.785	23.907
3.861	4.813	23.988
3.876	4.841	24.069
3.8911	4.87	24.151
3.9063	4.898	24.233
3.9216	4.928	24.316
3.937	4.957	24.4
3.9526	4.987	24.484
3.9683	5.017	24.568
3.9841	5.047	24.653
4.0	5.077	24.739
4.0161	5.107	24.825
4.0323	5.137	24.913
4.0486	5.169	25.001
4.065	5.2	25.089
4.0816	5.23	25.178
4.0984	5.26	25.269
4.1152	5.292	25.361
4.1322	5.325	25.454
4.1494	5.359	25.547
4.1667	5.392	25.64
4.1841	5.425	25.735
4.2017	5.459	25.831
4.2194	5.494	25.928
4.2373	5.531	26.026
4.2553	5.568	26.124
4.2735	5.607	26.223
4.2918	5.646	26.322
4.3103	5.687	26.42
4.329	5.726	26.518
4.3478	5.766	26.616
4.3668	5.806	26.716
4.386	5.847	26.815
4.4053	5.887	26.916
4.4248	5.928	27.017
4.4444	5.969	27.12
4.4643	6.012	27.222
4.4843	6.053	27.325
4.5045	6.097	27.428
4.5249	6.139	27.533
4.5455	6.183	27.637
4.5662	6.226	27.742
4.5872	6.271	27.848
4.6083	6.315	27.954
4.6296	6.359	28.06
4.6512	6.402	28.168
4.6729	6.446	28.276
4.6948	6.491	28.385
4.717	6.534	28.496
4.7393	6.579	28.608
4.7619	6.624	28.721
4.7847	6.671	28.834
4.8077	6.717	28.948
4.8309	6.762	29.064
4.8544	6.808	29.181
4.878	6.857	29.299
4.902	6.906	29.417
4.9261	6.954	29.535
4.9505	7.002	29.654
4.9751	7.049	29.775
5.0	7.097	29.898
5.0251	7.146	30.022
5.0505	7.195	30.148
5.0761	7.245	30.274
5.102	7.296	30.402
5.1282	7.348	30.532
5.1546	7.4	30.662
5.1813	7.453	30.793
5.2083	7.506	30.926
5.2356	7.56	31.06
5.2632	7.615	31.195
5.291	7.671	31.331
5.3191	7.727	31.468
5.3476	7.784	31.606
5.3763	7.841	31.745
5.4054	7.899	31.885
5.4348	7.958	32.026
5.4645	8.015	32.168
5.4945	8.072	32.313
5.5249	8.129	32.461
5.5556	8.19	32.612
5.5866	8.252	32.763
5.618	8.317	32.914
5.6497	8.381	33.065
5.6818	8.445	33.217
5.7143	8.507	33.371
5.7471	8.569	33.528
5.7803	8.633	33.688
5.814	8.698	33.85
5.848	8.765	34.015
5.8824	8.834	34.181
5.9172	8.903	34.347
5.9524	8.973	34.514
5.988	9.041	34.685
6.0241	9.111	34.859
6.0606	9.183	35.037
6.0976	9.258	35.216
6.135	9.334	35.397
6.1728	9.411	35.581
6.2112	9.492	35.766
6.25	9.573	35.952
6.2893	9.656	36.14
6.3291	9.738	36.332
6.3694	9.825	36.528
6.4103	9.916	36.724
6.4516	10.009	36.921
6.4935	10.103	37.12
6.5359	10.199	37.321
6.5789	10.3	37.524
6.6225	10.403	37.729
6.6667	10.511	37.931
6.7114	10.62	38.133
6.7568	10.728	38.334
6.8027	10.836	38.538
6.8493	10.946	38.744
6.8966	11.06	38.951
6.9444	11.174	39.159
6.993	11.291	39.365
7.0423	11.407	39.573
7.0922	11.527	39.78
7.1429	11.644	39.989
7.1942	11.762	40.197
7.2464	11.88	40.409
7.2993	11.998	40.621
7.3529	12.118	40.834
7.4074	12.235	41.047
7.4627	12.352	41.264
7.5188	12.468	41.484
7.5758	12.586	41.707
7.6336	12.705	41.93
7.6923	12.821	42.154
7.7519	12.936	42.38
7.8125	13.047	42.611
7.874	13.158	42.847
7.9365	13.266	43.088
8.0	13.375	43.337
8.0645	13.484	43.592
8.1301	13.597	43.852
8.1967	13.712	44.116
8.2645	13.825	44.383
8.3333	13.938	44.657
8.4034	14.049	44.939
8.4746	14.164	45.229
8.547	14.28	45.527
8.6207	14.403	45.83
8.6957	14.526	46.14
8.7719	14.652	46.456
8.8496	14.912	46.78
8.9286	15.051	47.114
9.009	15.051	47.453
9.0909	15.194	47.798
9.1743	15.343	48.147
9.2593	15.493	48.504
9.3458	15.649	48.865
9.434	15.806	49.236
9.5238	15.971	49.611
9.6154	16.137	49.997
9.7087	16.312	50.389
9.8039	16.493	50.79
9.901	16.684	51.193
10.0	16.878	51.601
10.101	17.076	52.013
10.2041	17.276	52.438
10.3093	17.486	52.87
10.4167	17.706	53.306
10.5263	17.932	53.746
10.6383	18.162	54.19
10.7527	18.397	54.64
10.8696	18.636	55.097
10.989	18.88	55.56
11.1111	19.13	56.031
11.236	19.385	56.509
11.3636	19.646	56.993
11.4943	19.912	57.485
11.6279	20.182	57.982
11.7647	20.453	58.489
11.9048	20.726	59.009
12.0482	21.006	59.547
12.1951	21.301	60.094
12.3457	21.606	60.647
12.5	21.916	61.204
12.6582	22.227	61.773
12.8205	22.542	62.357
12.987	22.867	62.955
13.1579	23.2	63.563
13.3333	23.537	64.187
13.5135	23.884	64.825
13.6986	24.238	65.482
13.8889	24.608	66.149
14.0845	24.982	66.833
14.2857	25.367	67.531
14.492	25.759	68.251
14.7059	26.165	68.989
14.9254	26.585	69.745
15.1515	27.018	70.518
15.3846	27.464	71.308
15.625	27.922	72.113
15.873	28.385	72.939
16.129	28.857	73.791
16.3934	29.342	74.674
16.6667	29.848	75.584
16.9492	30.372	76.519
17.2414	30.915	77.478
17.5439	31.475	78.457
17.8571	32.043	79.466
18.1818	32.622	80.507
18.5185	33.212	81.598
18.8679	33.83	82.726
19.2308	34.469	83.9
19.6078	35.134	85.11
20.0	35.815	86.381
20.4082	36.537	87.705
20.8333	37.298	89.081
21.2766	38.101	90.491
21.7391	38.921	91.95
22.2222	39.76	93.481
22.7273	40.63	95.102
23.2558	41.557	96.82
23.8095	42.559	98.608
24.3902	43.616	100.47
25.0	44.72	102.423
25.641	45.879	104.502
26.3158	47.131	106.723
27.027	48.511	109.066
27.7778	50.022	111.531
28.5714	51.675	114.093
29.4118	53.449	116.784
30.303	55.37	119.629
31.25	57.475	122.654
32.2581	59.821	125.831
33.3333	62.41	129.145
34.4828	65.251	132.621
35.7143	68.393	136.282
37.037	71.895	140.107
38.4615	75.795	144.087
40.0	80.139	148.216
41.6667	84.991	152.486
43.4783	90.419	156.828
45.4545	96.436	161.229
47.619	103.106	165.71
50.0	110.527	170.24
52.6316	118.974	175.042
55.5556	128.885	179.3

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) →

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Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/other/alloys/Cu-Zn/nk/Querry-Cu70Zn30.yml
ID: ds_80c5f733b8ef
API: /v1/datasets/ds_80c5f733b8ef

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