Optical constants

Refractive index of AgBr (Silver bromide)

Schröter 1931: n 0.495–0.67 µm

Data: formula 8
Range: 0.495–0.67 µm
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 2.25793
Extinction coefficient k: 0

Permittivity ε₁: 5.09826
Permittivity ε₂: 0

Absorption coefficient α: 0 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.406612 µm⁻¹

Group index n_g: 2.49686
Group velocity dispersion: 1048.41 fs²/mm

Dispersion parameter D: -5719.64 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

# AgBr (Silver bromide): Schröter 1931: n 0.495–0.67 µm
agbr = ls.fetch_refractiveindex("main", "AgBr", "Schröter", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(agbr.range_nm)  # (495, 670) nm
eps = agbr.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_bfbd20f69cd6/lightsmith"
agbr = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(agbr.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (agbr/schroter-1931).

# ... load agbr as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=agbr)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=495, stop_nm=670, 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.

Dispersion formula

Retro (formula 8), λ in µm

\frac{n^{2} - 1}{n^{2} + 2} = 0.452505 + \frac{0.09939 λ^{2}}{λ^{2} - 0.070537} - 0.00015 λ^{2}

Valid from 0.495 to 0.67 µm.

Coefficients as stored

C_i	Value
C1	0.452505
C2	0.09939
C3	0.070537
C4	-0.00015

References

H. Schröter. Über die Brechungsindizes einiger Schwermetallhalogenide im Sichtbaren und die Berechnung von Interpolationsformeln für den Dispersionsverlauf (On the refractive indices of some heavy-metal halides in the visible and calculation of interpolation formulas for dispersion). Z. Phys. 67, 24-36 (1931) [in German]

doi:10.1007/bf01391040 �ber die Brechungsindizes einiger Schwermetallhalogenide im Sichtbaren und die Berechnung von Interpolationsformeln f�r den Dispersionsverlauf, Zeitschrift f�r Physik (1931)

Cite

H. Schr�ter. �ber die Brechungsindizes einiger Schwermetallhalogenide im Sichtbaren und die Berechnung von Interpolationsformeln f�r den Dispersionsverlauf. Zeitschrift f�r Physik, 67, 24-36 (1931), doi:10.1007/bf01391040; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 400 wavelengths, the same grid as the API and the library

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

AgBr (Silver bromide), Schröter 1931: n 0.495–0.67 µm: n and k versus wavelength
λ (µm)	n
0.495	2.313786
0.495376	2.313452
0.495752	2.31312
0.496128	2.312789
0.496505	2.312459
0.496881	2.31213
0.497258	2.311801
0.497636	2.311474
0.498014	2.311148
0.498392	2.310823
0.49877	2.310498
0.499148	2.310175
0.499527	2.309853
0.499906	2.309531
0.500286	2.309211
0.500665	2.308891
0.501045	2.308573
0.501426	2.308255
0.501806	2.307938
0.502187	2.307623
0.502568	2.307308
0.50295	2.306994
0.503332	2.306681
0.503714	2.306369
0.504096	2.306058
0.504478	2.305747
0.504861	2.305438
0.505245	2.30513
0.505628	2.304822
0.506012	2.304516
0.506396	2.30421
0.50678	2.303905
0.507165	2.303601
0.50755	2.303298
0.507935	2.302996
0.50832	2.302695
0.508706	2.302394
0.509092	2.302095
0.509479	2.301796
0.509865	2.301498
0.510252	2.301201
0.51064	2.300905
0.511027	2.30061
0.511415	2.300315
0.511803	2.300022
0.512192	2.299729
0.512581	2.299437
0.51297	2.299146
0.513359	2.298856
0.513749	2.298566
0.514138	2.298278
0.514529	2.29799
0.514919	2.297703
0.51531	2.297417
0.515701	2.297132
0.516093	2.296847
0.516484	2.296564
0.516876	2.296281
0.517269	2.295999
0.517661	2.295718
0.518054	2.295437
0.518447	2.295157
0.518841	2.294879
0.519235	2.2946
0.519629	2.294323
0.520023	2.294047
0.520418	2.293771
0.520813	2.293496
0.521208	2.293222
0.521604	2.292948
0.521999	2.292676
0.522396	2.292404
0.522792	2.292132
0.523189	2.291862
0.523586	2.291592
0.523983	2.291323
0.524381	2.291055
0.524779	2.290788
0.525177	2.290521
0.525576	2.290255
0.525975	2.28999
0.526374	2.289726
0.526774	2.289462
0.527173	2.289199
0.527574	2.288937
0.527974	2.288675
0.528375	2.288414
0.528776	2.288154
0.529177	2.287895
0.529579	2.287636
0.529981	2.287378
0.530383	2.287121
0.530785	2.286864
0.531188	2.286609
0.531591	2.286353
0.531995	2.286099
0.532399	2.285845
0.532803	2.285592
0.533207	2.28534
0.533612	2.285088
0.534017	2.284837
0.534422	2.284587
0.534828	2.284337
0.535234	2.284088
0.53564	2.28384
0.536046	2.283592
0.536453	2.283345
0.536861	2.283099
0.537268	2.282853
0.537676	2.282608
0.538084	2.282364
0.538492	2.28212
0.538901	2.281877
0.53931	2.281635
0.539719	2.281393
0.540129	2.281152
0.540539	2.280912
0.540949	2.280672
0.54136	2.280433
0.541771	2.280194
0.542182	2.279956
0.542593	2.279719
0.543005	2.279483
0.543417	2.279247
0.54383	2.279011
0.544242	2.278777
0.544656	2.278543
0.545069	2.278309
0.545483	2.278076
0.545897	2.277844
0.546311	2.277612
0.546726	2.277381
0.547141	2.277151
0.547556	2.276921
0.547971	2.276692
0.548387	2.276464
0.548804	2.276236
0.54922	2.276008
0.549637	2.275781
0.550054	2.275555
0.550472	2.27533
0.550889	2.275105
0.551307	2.27488
0.551726	2.274656
0.552145	2.274433
0.552564	2.27421
0.552983	2.273988
0.553403	2.273767
0.553823	2.273546
0.554243	2.273326
0.554664	2.273106
0.555085	2.272887
0.555506	2.272668
0.555928	2.27245
0.55635	2.272232
0.556772	2.272015
0.557195	2.271799
0.557617	2.271583
0.558041	2.271368
0.558464	2.271153
0.558888	2.270939
0.559312	2.270725
0.559737	2.270512
0.560162	2.2703
0.560587	2.270088
0.561012	2.269876
0.561438	2.269666
0.561864	2.269455
0.562291	2.269245
0.562717	2.269036
0.563144	2.268827
0.563572	2.268619
0.564	2.268411
0.564428	2.268204
0.564856	2.267998
0.565285	2.267792
0.565714	2.267586
0.566143	2.267381
0.566573	2.267176
0.567003	2.266972
0.567433	2.266769
0.567864	2.266566
0.568295	2.266363
0.568726	2.266161
0.569158	2.26596
0.56959	2.265759
0.570022	2.265559
0.570455	2.265359
0.570888	2.265159
0.571321	2.26496
0.571755	2.264762
0.572189	2.264564
0.572623	2.264367
0.573058	2.26417
0.573493	2.263973
0.573928	2.263777
0.574363	2.263582
0.574799	2.263387
0.575236	2.263192
0.575672	2.262998
0.576109	2.262805
0.576546	2.262612
0.576984	2.262419
0.577422	2.262227
0.57786	2.262035
0.578299	2.261844
0.578738	2.261654
0.579177	2.261463
0.579616	2.261274
0.580056	2.261084
0.580497	2.260896
0.580937	2.260707
0.581378	2.260519
0.581819	2.260332
0.582261	2.260145
0.582703	2.259959
0.583145	2.259773
0.583588	2.259587
0.584031	2.259402
0.584474	2.259217
0.584918	2.259033
0.585362	2.258849
0.585806	2.258666
0.58625	2.258483
0.586695	2.258301
0.587141	2.258119
0.587586	2.257937
0.588032	2.257756
0.588479	2.257576
0.588925	2.257396
0.589372	2.257216
0.58982	2.257036
0.590267	2.256858
0.590715	2.256679
0.591164	2.256501
0.591612	2.256324
0.592061	2.256146
0.592511	2.25597
0.59296	2.255793
0.59341	2.255618
0.593861	2.255442
0.594312	2.255267
0.594763	2.255093
0.595214	2.254918
0.595666	2.254745
0.596118	2.254571
0.59657	2.254398
0.597023	2.254226
0.597476	2.254054
0.59793	2.253882
0.598384	2.253711
0.598838	2.25354
0.599292	2.25337
0.599747	2.253199
0.600202	2.25303
0.600658	2.252861
0.601114	2.252692
0.60157	2.252523
0.602027	2.252355
0.602483	2.252188
0.602941	2.25202
0.603398	2.251854
0.603856	2.251687
0.604315	2.251521
0.604773	2.251356
0.605232	2.25119
0.605692	2.251025
0.606151	2.250861
0.606611	2.250697
0.607072	2.250533
0.607533	2.25037
0.607994	2.250207
0.608455	2.250044
0.608917	2.249882
0.609379	2.249721
0.609842	2.249559
0.610305	2.249398
0.610768	2.249238
0.611231	2.249077
0.611695	2.248917
0.612159	2.248758
0.612624	2.248599
0.613089	2.24844
0.613554	2.248282
0.61402	2.248124
0.614486	2.247966
0.614952	2.247809
0.615419	2.247652
0.615886	2.247495
0.616354	2.247339
0.616822	2.247183
0.61729	2.247028
0.617758	2.246873
0.618227	2.246718
0.618696	2.246564
0.619166	2.24641
0.619636	2.246256
0.620106	2.246103
0.620577	2.24595
0.621048	2.245797
0.621519	2.245645
0.621991	2.245493
0.622463	2.245341
0.622935	2.24519
0.623408	2.245039
0.623881	2.244889
0.624355	2.244739
0.624829	2.244589
0.625303	2.24444
0.625778	2.24429
0.626253	2.244142
0.626728	2.243993
0.627204	2.243845
0.62768	2.243697
0.628156	2.24355
0.628633	2.243403
0.62911	2.243256
0.629587	2.24311
0.630065	2.242964
0.630543	2.242818
0.631022	2.242673
0.631501	2.242528
0.63198	2.242383
0.63246	2.242238
0.63294	2.242094
0.63342	2.241951
0.633901	2.241807
0.634382	2.241664
0.634864	2.241521
0.635346	2.241379
0.635828	2.241237
0.63631	2.241095
0.636793	2.240953
0.637277	2.240812
0.63776	2.240671
0.638244	2.240531
0.638729	2.240391
0.639214	2.240251
0.639699	2.240111
0.640184	2.239972
0.64067	2.239833
0.641156	2.239694
0.641643	2.239556
0.64213	2.239418
0.642617	2.23928
0.643105	2.239143
0.643593	2.239006
0.644082	2.238869
0.64457	2.238733
0.64506	2.238596
0.645549	2.238461
0.646039	2.238325
0.64653	2.23819
0.64702	2.238055
0.647511	2.23792
0.648003	2.237786
0.648495	2.237652
0.648987	2.237518
0.649479	2.237385
0.649972	2.237251
0.650466	2.237119
0.650959	2.236986
0.651453	2.236854
0.651948	2.236722
0.652443	2.23659
0.652938	2.236459
0.653433	2.236328
0.653929	2.236197
0.654426	2.236066
0.654922	2.235936
0.65542	2.235806
0.655917	2.235676
0.656415	2.235547
0.656913	2.235418
0.657412	2.235289
0.657911	2.235161
0.65841	2.235032
0.65891	2.234904
0.65941	2.234777
0.65991	2.234649
0.660411	2.234522
0.660912	2.234395
0.661414	2.234269
0.661916	2.234143
0.662418	2.234017
0.662921	2.233891
0.663424	2.233765
0.663928	2.23364
0.664432	2.233515
0.664936	2.233391
0.665441	2.233266
0.665946	2.233142
0.666451	2.233018
0.666957	2.232895
0.667463	2.232772
0.66797	2.232649
0.668477	2.232526
0.668984	2.232403
0.669492	2.232281
0.67	2.232159

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: —

AgBr (Silver bromide): all datasets

About AgBr (Silver bromide)

AgBr, or silver bromide, is an inorganic compound that has been extensively studied for its photo-sensitive properties. This ionic material forms a face-centered cubic crystal structure and exhibits a direct bandgap, making it an effective absorber of photons. Historically, AgBr has been a key material in traditional photographic films, where exposure to light leads to the reduction of the material and the formation of elemental silver, thereby creating a visible image. In the realm of modern technology, AgBr is being explored for its utility in optoelectronic devices, such as photodetectors and solar cells. Its wide bandgap and high refractive index make it suitable for applications requiring spectral selectivity and efficient light-matter interactions. However, it is sensitive to environmental factors like humidity and needs to be carefully encapsulated or treated to maintain its optical characteristics. In addition to its bulk form, AgBr nanostructures have also been studied for their unique optical and catalytic properties. Overall, AgBr continues to be a material of significant interest in both historical and emerging technologies, thanks to its unique photo-responsive behavior and optoelectronic properties.

More about AgBr (Silver bromide) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/AgBr/nk/Schroter.yml
ID: ds_bfbd20f69cd6
API: /v1/datasets/ds_bfbd20f69cd6

Plot