Optical constants

Refractive index of GaP (Gallium phosphide)

Jellison 1992: n,k 0.234–0.840 µm

Data: tabulated nk
Range: 0.234–0.84 µm
Points: 187
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 3.37932
Extinction coefficient k: -0.002

Permittivity ε₁: 11.4198
Permittivity ε₂: -0.0135173

Absorption coefficient α: -427.719 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -1.8 µm⁻¹

Group index n_g: 4.437
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): Jellison 1992: n,k 0.234–0.840 µm
gap = ls.fetch_refractiveindex("main", "GaP", "Jellison", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(gap.range_nm)  # (234, 840) 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_08a7b04e7b75/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/jellison-1992).

# ... 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=840, 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

Crysal orientation: <100>; Room temperature

Notes on the source data (kept exactly as published):

k < 0 at some wavelengths in the source data (gain, or a sign convention issue)

References

G. E. Jellison Jr. Optical functions of GaAs, GaP, and Ge determined by two-channel polarization modulation ellipsometry. Opt. Mat. 1, 151-160 (1992)

doi:10.1016/0925-3467(92)90022-f Optical functions of GaAs, GaP, and Ge determined by two-channel polarization modulation ellipsometry, Optical Materials (1992)

Cite

G.E. Jellison. Optical functions of GaAs, GaP, and Ge determined by two-channel polarization modulation ellipsometry. Optical Materials, 1, 151-160 (1992), doi:10.1016/0925-3467(92)90022-f; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

187 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), Jellison 1992: n,k 0.234–0.840 µm: n and k versus wavelength
λ (µm)	n	k
0.234	2.629	4.189
0.236	2.807	4.174
0.238	3.003	4.153
0.24	3.21	4.106
0.242	3.435	4.024
0.244	3.593	3.879
0.246	3.729	3.728
0.248	3.816	3.583
0.25	3.909	3.478
0.252	3.978	3.347
0.254	4.038	3.265
0.256	4.117	3.161
0.258	4.194	3.063
0.26	4.216	2.914
0.262	4.302	2.776
0.264	4.306	2.634
0.266	4.289	2.505
0.268	4.257	2.383
0.27	4.209	2.29
0.272	4.157	2.221
0.274	4.112	2.154
0.276	4.06	2.114
0.278	4.025	2.082
0.28	3.989	2.059
0.282	3.954	2.04
0.284	3.926	2.029
0.286	3.898	2.024
0.288	3.878	2.02
0.29	3.862	2.022
0.292	3.855	2.019
0.294	3.842	2.027
0.296	3.836	2.032
0.298	3.833	2.042
0.3	3.834	2.054
0.302	3.838	2.066
0.304	3.844	2.084
0.306	3.852	2.102
0.308	3.865	2.123
0.31	3.886	2.146
0.312	3.907	2.17
0.314	3.937	2.199
0.316	3.963	2.239
0.318	4.001	2.276
0.32	4.055	2.328
0.322	4.122	2.383
0.324	4.219	2.438
0.326	4.357	2.496
0.328	4.516	2.528
0.33	4.71	2.522
0.332	4.924	2.461
0.334	5.137	2.336
0.336	5.309	2.16
0.338	5.434	1.923
0.34	5.483	1.678
0.342	5.472	1.446
0.344	5.417	1.257
0.346	5.344	1.103
0.348	5.264	0.977
0.35	5.186	0.874
0.352	5.107	0.794
0.354	5.036	0.726
0.356	4.97	0.668
0.358	4.906	0.615
0.36	4.853	0.576
0.362	4.799	0.539
0.364	4.749	0.503
0.366	4.702	0.474
0.368	4.657	0.448
0.37	4.615	0.426
0.372	4.577	0.404
0.374	4.54	0.385
0.376	4.504	0.366
0.378	4.474	0.351
0.38	4.439	0.336
0.382	4.405	0.32
0.384	4.376	0.309
0.386	4.351	0.297
0.388	4.324	0.287
0.39	4.301	0.275
0.392	4.276	0.266
0.394	4.257	0.257
0.396	4.234	0.248
0.398	4.214	0.239
0.4	4.194	0.231
0.402	4.174	0.224
0.404	4.155	0.216
0.406	4.138	0.209
0.408	4.122	0.202
0.41	4.106	0.197
0.412	4.09	0.191
0.414	4.077	0.184
0.416	4.063	0.178
0.418	4.049	0.173
0.42	4.036	0.167
0.422	4.025	0.163
0.424	4.013	0.157
0.426	3.995	0.15
0.428	3.987	0.144
0.43	3.98	0.136
0.432	3.969	0.129
0.434	3.961	0.123
0.436	3.953	0.116
0.438	3.945	0.107
0.44	3.938	0.097
0.442	3.929	0.085
0.444	3.917	0.073
0.446	3.904	0.062
0.448	3.89	0.053
0.45	3.875	0.045
0.455	3.839	0.022
0.46	3.798	0.01
0.465	3.761	0.006
0.47	3.729	0.003
0.475	3.702	0.002
0.48	3.677	0.0
0.485	3.649	0.0
0.49	3.628	0.0
0.495	3.609	0.0
0.5	3.59	-0.001
0.505	3.573	-0.001
0.51	3.557	-0.002
0.515	3.541	-0.002
0.52	3.527	-0.002
0.525	3.514	-0.002
0.53	3.502	-0.003
0.535	3.486	-0.002
0.54	3.476	-0.002
0.545	3.463	-0.002
0.55	3.452	-0.002
0.555	3.441	-0.002
0.56	3.431	-0.003
0.565	3.422	-0.002
0.57	3.41	-0.002
0.575	3.403	-0.002
0.58	3.393	-0.002
0.585	3.384	-0.002
0.59	3.375	-0.002
0.595	3.368	-0.002
0.6	3.361	-0.002
0.605	3.355	-0.001
0.61	3.347	-0.002
0.615	3.341	-0.001
0.62	3.335	-0.002
0.625	3.329	-0.002
0.63	3.319	-0.002
0.635	3.315	-0.001
0.64	3.31	-0.001
0.645	3.304	-0.002
0.65	3.3	-0.001
0.655	3.295	-0.001
0.66	3.29	-0.001
0.665	3.284	-0.001
0.67	3.28	-0.002
0.675	3.276	-0.001
0.68	3.273	0.0
0.685	3.27	-0.001
0.69	3.263	-0.001
0.695	3.26	-0.001
0.7	3.257	0.0
0.705	3.253	-0.002
0.71	3.249	0.0
0.715	3.247	0.0
0.72	3.24	0.0
0.725	3.238	0.0
0.73	3.233	0.0
0.735	3.23	0.0
0.74	3.227	0.0
0.745	3.224	0.0
0.75	3.222	0.0
0.755	3.22	0.0
0.76	3.217	0.0
0.765	3.213	0.0
0.77	3.21	0.0
0.775	3.207	0.0
0.78	3.205	0.0
0.785	3.201	0.0
0.79	3.201	0.0
0.795	3.198	0.0
0.8	3.197	0.0
0.805	3.194	0.0
0.81	3.191	0.0
0.815	3.19	-0.001
0.82	3.188	0.0
0.825	3.183	0.0
0.83	3.18	0.002
0.835	3.182	0.004
0.84	3.187	0.006

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/Jellison.yml
ID: ds_08a7b04e7b75
API: /v1/datasets/ds_08a7b04e7b75

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