Optical constants

Refractive index of GaP (Gallium phosphide)

Aspnes and Studna 1983: n,k 0.21–0.83 µm

Data: tabulated nk
Range: 0.2066–0.8266 µm
Points: 46
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 3.37981
Extinction coefficient k: 0

Permittivity ε₁: 11.4231
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -1.71642 µm⁻¹

Group index n_g: 4.38837
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): Aspnes and Studna 1983: n,k 0.21–0.83 µm
gap = ls.fetch_refractiveindex("main", "GaP", "Aspnes", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(gap.range_nm)  # (206.6, 826.6) 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_4f4d984e4cd6/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/aspnes-studna-1983).

# ... 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=826, 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: <110>; Undoped; Room temperature

References

D. E. Aspnes and A. A. Studna. Dielectric functions and optical parameters of Si, Ge, GaP, GaAs, GaSb, InP, InAs, and InSb from 1.5 to 6.0 eV. Phys. Rev. B 27, 985-1009 (1983)

doi:10.1103/physrevb.27.985 Dielectric functions and optical parameters of Si, Ge, GaP, GaAs, GaSb, InP, InAs, and InSb from 1.5 to 6.0 eV, Physical Review B (1983)

Cite

D. E. Aspnes and A. A. Studna. Dielectric functions and optical parameters of Si, Ge, GaP, GaAs, GaSb, InP, InAs, and InSb from 1.5 to 6.0 eV. Physical Review B, 27, 985-1009 (1983), doi:10.1103/physrevb.27.985; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

46 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), Aspnes and Studna 1983: n,k 0.21–0.83 µm: n and k versus wavelength
λ (µm)	n	k
0.2066	1.309	2.69
0.2101	1.327	2.803
0.2138	1.348	2.934
0.2175	1.385	3.096
0.2214	1.444	3.297
0.2254	1.543	3.556
0.2296	1.778	3.889
0.2339	2.249	4.168
0.2384	2.825	4.17
0.2431	3.342	3.975
0.248	3.661	3.631
0.253	3.844	3.358
0.2583	4.062	3.096
0.2638	4.181	2.712
0.2695	4.113	2.371
0.2755	3.978	2.18
0.2818	3.867	2.09
0.2883	3.792	2.058
0.2952	3.754	2.063
0.3024	3.752	2.1
0.31	3.79	2.171
0.3179	3.89	2.303
0.3263	4.196	2.562
0.3351	5.149	2.451
0.3444	5.406	1.368
0.3542	5.05	0.819
0.3647	4.751	0.568
0.3757	4.518	0.426
0.3875	4.339	0.337
0.3999	4.196	0.275
0.4133	4.081	0.224
0.4275	3.99	0.183
0.4428	3.919	0.118
0.4592	3.805	0.027
0.4769	3.691	0.011
0.4959	3.605	0.006
0.5166	3.535	0.004
0.5391	3.474	0.002
0.5636	3.421	0.0
0.5904	3.375	0.0
0.6199	3.334	0.0
0.6525	3.295	0.0
0.6888	3.262	0.0
0.7293	3.234	0.0
0.7749	3.209	0.0
0.8266	3.178	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/Aspnes.yml
ID: ds_4f4d984e4cd6
API: /v1/datasets/ds_4f4d984e4cd6

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