Optical constants

Refractive index of GaP (Gallium phosphide)

Adachi 1989: n,k 0.207–12.4 µm

Data: tabulated nk
Range: 0.2066–12.4 µm
Points: 200
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 3.40873
Extinction coefficient k: 0

Permittivity ε₁: 11.6194
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -1.34454 µm⁻¹

Group index n_g: 4.19878
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

# GaP (Gallium phosphide): Adachi 1989: n,k 0.207–12.4 µm
gap = ls.fetch_refractiveindex("main", "GaP", "Adachi", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(gap.range_nm)  # (206.64, 12398) nm
eps = gap.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_633800a22adb/lightsmith"
gap = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(gap.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (gap/adachi-1989).

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

References

S. Adachi. Optical dispersion relations for GaP, GaAs, GaSb, InP, InAs, InSb, Al_xGa_1−xAs, and In_1−xGa_xAs_yP_1−y. J. Appl. Phys. 66, 6030-6040 (1989)
[Calculation script (Python)]

doi:10.1063/1.343580 Optical dispersion relations for GaP, GaAs, GaSb, InP, InAs, InSb, Al x Ga1− x As, and In1− x Ga x As y P1− y, Journal of Applied Physics (1989)

Cite

Sadao Adachi. Optical dispersion relations for GaP, GaAs, GaSb, InP, InAs, InSb, Al x Ga1− x As, and In1− x Ga x As y P1− y. Journal of Applied Physics, 66, 6030-6040 (1989), doi:10.1063/1.343580; [Calculation script (Python)]; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

200 rows as published

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

GaP (Gallium phosphide), Adachi 1989: n,k 0.207–12.4 µm: n and k versus wavelength
λ (µm)	n	k
0.20664	1.7732	2.8544
0.20767	1.7879	2.8769
0.2087	1.8033	2.9003
0.20975	1.8193	2.9247
0.21081	1.836	2.95
0.21188	1.8536	2.9764
0.21295	1.8722	3.0039
0.21404	1.8918	3.0325
0.21515	1.9125	3.0624
0.21626	1.9346	3.0936
0.21738	1.9582	3.1262
0.21852	1.9835	3.1603
0.21967	2.0107	3.1958
0.22083	2.0401	3.2329
0.222	2.0719	3.2715
0.22318	2.1067	3.3118
0.22438	2.1447	3.3537
0.22559	2.1863	3.3971
0.22681	2.2322	3.4418
0.22805	2.2829	3.4878
0.2293	2.339	3.5347
0.23057	2.4013	3.5821
0.23184	2.4705	3.6292
0.23314	2.5473	3.6754
0.23444	2.6325	3.7194
0.23577	2.7266	3.7599
0.2371	2.8302	3.7951
0.23845	2.9432	3.8228
0.23982	3.0651	3.8407
0.2412	3.1949	3.8462
0.2426	3.3304	3.8368
0.24402	3.4687	3.8104
0.24545	3.606	3.7657
0.2469	3.738	3.7026
0.24837	3.8603	3.6223
0.24985	3.969	3.5276
0.25135	4.0613	3.4222
0.25287	4.1356	3.3105
0.25441	4.1919	3.197
0.25597	4.2315	3.0856
0.25755	4.2563	2.9795
0.25914	4.2691	2.8807
0.26076	4.2723	2.7907
0.26239	4.2685	2.71
0.26405	4.2601	2.6385
0.26573	4.2488	2.5759
0.26743	4.2363	2.5216
0.26915	4.2238	2.4747
0.27089	4.2121	2.4346
0.27266	4.2021	2.4003
0.27445	4.1942	2.3712
0.27626	4.1888	2.3465
0.2781	4.1862	2.3256
0.27996	4.1866	2.3079
0.28185	4.1901	2.293
0.28376	4.1968	2.2803
0.2857	4.2068	2.2694
0.28766	4.2202	2.2601
0.28966	4.237	2.2519
0.29168	4.2573	2.2446
0.29372	4.2812	2.238
0.2958	4.3088	2.2317
0.29791	4.3402	2.2256
0.30005	4.3756	2.2194
0.30222	4.4152	2.2129
0.30442	4.4594	2.2059
0.30665	4.5085	2.1982
0.30891	4.563	2.1894
0.31121	4.6234	2.1794
0.31354	4.6906	2.1678
0.31591	4.7655	2.1542
0.31832	4.8495	2.1381
0.32076	4.9442	2.1191
0.32324	5.0518	2.0964
0.32576	5.1745	2.0696
0.32831	5.3134	2.0388
0.33091	5.4621	2.0068
0.33355	5.5873	1.9858
0.33623	5.5495	1.7832
0.33896	5.4062	1.5869
0.34173	5.2469	1.4668
0.34454	5.0978	1.3683
0.34741	4.9655	1.2774
0.35032	4.8488	1.1893
0.35328	4.7451	1.1018
0.35629	4.6523	1.0139
0.35935	4.5686	0.92485
0.36246	4.4926	0.83421
0.36563	4.4125	0.67305
0.36886	4.351	0.57938
0.37214	4.2953	0.48329
0.37548	4.2449	0.38462
0.37888	4.1998	0.28323
0.38235	4.1614	0.21213
0.38588	4.1297	0.20928
0.38947	4.1003	0.20596
0.39313	4.0731	0.20215
0.39686	4.0479	0.19781
0.40066	4.0245	0.19288
0.40454	4.0028	0.18729
0.40849	3.9827	0.18097
0.41252	3.964	0.17379
0.41663	3.9467	0.16561
0.42082	3.9308	0.15617
0.4251	3.916	0.14513
0.42947	3.9025	0.13179
0.43392	3.89	0.11427
0.43847	3.8662	0.08986
0.44312	3.8453	0.077149
0.44786	3.8285	0.059733
0.45271	3.805	0.018467
0.45767	3.7572	0.01682
0.46273	3.7265	0.015122
0.46791	3.7002	0.013448
0.4732	3.6764	0.011817
0.47862	3.6544	0.010242
0.48416	3.6338	0.0087334
0.48983	3.6143	0.0073031
0.49564	3.5958	0.005962
0.50158	3.5781	0.004722
0.50767	3.5612	0.0035952
0.51391	3.5449	0.0025945
0.5203	3.5293	0.0017339
0.52686	3.5143	0.001028
0.53358	3.4998	0.00049262
0.54048	3.4858	0.00014469
0.54756	3.4723	2.4128e-06
0.55482	3.4593	0.0
0.56228	3.4466	0.0
0.56994	3.4343	0.0
0.57782	3.4225	0.0
0.58591	3.411	0.0
0.59424	3.3998	0.0
0.60281	3.3889	0.0
0.61162	3.3784	0.0
0.6207	3.3682	0.0
0.63005	3.3583	0.0
0.63969	3.3486	0.0
0.64963	3.3393	0.0
0.65988	3.3302	0.0
0.67046	3.3213	0.0
0.68138	3.3127	0.0
0.69267	3.3043	0.0
0.70433	3.2962	0.0
0.7164	3.2883	0.0
0.72889	3.2806	0.0
0.74182	3.2731	0.0
0.75521	3.2658	0.0
0.7691	3.2587	0.0
0.78351	3.2518	0.0
0.79847	3.2451	0.0
0.81402	3.2386	0.0
0.83018	3.2323	0.0
0.84699	3.2261	0.0
0.8645	3.2202	0.0
0.88275	3.2143	0.0
0.90179	3.2087	0.0
0.92166	3.2032	0.0
0.94243	3.1979	0.0
0.96416	3.1927	0.0
0.98691	3.1877	0.0
1.0108	3.1828	0.0
1.0358	3.1781	0.0
1.0621	3.1735	0.0
1.0898	3.1691	0.0
1.119	3.1648	0.0
1.1497	3.1607	0.0
1.1822	3.1566	0.0
1.2166	3.1528	0.0
1.2531	3.149	0.0
1.2918	3.1454	0.0
1.3329	3.1419	0.0
1.3768	3.1385	0.0
1.4237	3.1352	0.0
1.4739	3.1321	0.0
1.5277	3.1291	0.0
1.5857	3.1262	0.0
1.6482	3.1234	0.0
1.7158	3.1208	0.0
1.7892	3.1183	0.0
1.8692	3.1158	0.0
1.9566	3.1135	0.0
2.0527	3.1113	0.0
2.1586	3.1092	0.0
2.2761	3.1073	0.0
2.4071	3.1054	0.0
2.5541	3.1036	0.0
2.7203	3.102	0.0
2.9095	3.1004	0.0
3.1271	3.099	0.0
3.3798	3.0977	0.0
3.677	3.0965	0.0
4.0315	3.0953	0.0
4.4616	3.0943	0.0
4.9945	3.0934	0.0
5.6719	3.0926	0.0
6.5619	3.0919	0.0
7.7832	3.0913	0.0
9.5631	3.0908	0.0
12.398	3.0904	0.0

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: —

GaP (Gallium phosphide): all datasets

Experimental data

Models and simulations

Adachi 1989: n,k 0.207–12.4 µm n,k 0.2066–12.4 µm

About GaP (Gallium phosphide)

Gallium phosphide (GaP) is a binary III-V semiconductor with a direct bandgap of 2.26 eV, making it useful in specific optoelectronic applications. It is commonly employed in red, orange, and green light-emitting diodes (LEDs). One of the notable advantages of GaP is its high thermal conductivity, which allows for better heat dissipation in electronic devices. While it does not exhibit the same level of efficiency as materials like GaAs in high-frequency applications, GaP is used as a substrate material for other III-V semiconductors, such as GaAs and InP, to form heterostructure devices. It also finds applications in photonic integrated circuits and is sometimes used in combination with other semiconductors to engineer desired electronic or optical properties.

More about GaP (Gallium phosphide) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/GaP/nk/Adachi.yml
ID: ds_633800a22adb
API: /v1/datasets/ds_633800a22adb

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