Optical constants
Refractive index of GaAs - Galium arsenide (CRYSTRAN)
GaAs - Galium arsenide: n,k 1.033–19.07 µm
- Data
- tabulated n + tabulated k
- Range
- 1.033–19.07 µm
- Points
- 18
- State
- crystalline
- Licence
- CC0-1.0
Plot
Click the plot to set the calculator wavelength.
At one wavelength
- Refractive index n
- 3.30088
- Extinction coefficient k
- 0
- Permittivity ε1
- 10.8958
- Permittivity ε2
- 0
- Absorption coefficient α
- 0 cm⁻¹
- Penetration depth δ = λ/(2πk)
- — nm
- Abbe number Vd
- —
- Chromatic dispersion dn/dλ
- -0.0059322 µm⁻¹
- Group index ng
- 3.32722
- Group velocity dispersion
- — fs²/mm
- Dispersion parameter D
- — ps/(nm·km)
- Photon energy
- 0.279244 eV
ε = (n + ik)², α = 4πk/λ, ng = 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
# GaAs - Galium arsenide (CRYSTRAN): GaAs - Galium arsenide
crystran_gaas = ls.fetch_refractiveindex("specs", "CRYSTRAN-optical", "GaAs", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(crystran_gaas.range_nm) # (1033, 19070) nm
eps = crystran_gaas.eps([4440]) # complex permittivityDownloads 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_ede142e069cd/lightsmith"
crystran_gaas = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(crystran_gaas.source) # citation and provenance travel with the dataAny dataset here, as the library's Tabulated material (crystran-gaas/crystran).
# ... load crystran_gaas as above, then:
sim = ls.Simulation(
particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=crystran_gaas)],
medium_index=1.0,
wavelengths=ls.WavelengthRange(start_nm=1033, stop_nm=19070, num=81),
)
res = ls.solve(sim) # exact Mie for a sphere
print(res.q_ext) # extinction efficiency at each wavelengthSame spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).
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
Properties
- density
- value: 5315
- thermal dispersion
- type: constant, value: 147e-06, wavelength: 10
- thermal expansion
- value: 5.7e-06, temperature: 300
- hardness
- type: Knoop, value: 7.35e9
- melting point
- value: 1784
- thermal conductivity
- value: 48, temperature: 273
- youngs modulus
- value: 84.81e9
- poissons ratio
- value: 0.31
- solubility
- value: 0
Thermo-optic coefficient
- dn/dT = 0.000147 K⁻¹ at 10000 nm
References
See also Crystran GaAs online data sheet
Cite
Crystran Ltd. The Crystran handbook of infra-red and ultra-violet optical materials (5th edition, 2023); See also Crystran GaAs online data sheet; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)
Data
Computed on 18 wavelengths, the same grid as the API and the library| λ (µm) | n | k |
|---|---|---|
| 1.033 | 3.492 | 1.224000e-05 |
| 1.55 | 3.3737 | 6.900000e-07 |
| 2.066 | 3.338 | 0 |
| 2.48 | 3.324 | 0 |
| 3.1 | 3.3125 | 0 |
| 4.133 | 3.3027 | 0 |
| 4.959 | 3.2978 | 0 |
| 6.199 | 3.2921 | 0 |
| 7.293 | 3.2874 | 0 |
| 8.266 | 3.2831 | 0 |
| 9.537 | 3.2769 | 0 |
| 10.33 | 3.2727 | 0 |
| 11.27 | 3.2671 | 0 |
| 12.4 | 3.2597 | 0 |
| 13.78 | 3.2493 | 7.384000e-06 |
| 15.5 | 3.2336 | 1.860000e-05 |
| 17.71 | 3.2081 | 0.0002206 |
| 19.07 | 3.1866 | 0.006084 |
Optical transmission calculator
Free-standing sample in vacuum, normal incidence- Transmittance T
- —
- Reflectance R
- —
Fresnel reflection calculator
- Rp
- —
- Rs
- —
- R = (Rp+Rs)/2
- —
- Phase φp
- —
- Phase φs
- —
- Brewster angle θB
- —
- Critical angle θC
- —
Gallium Arsenide has specialist applications in far IR optics and lens systems.
Gallium Arsenide is produced by Czochralski or horizontal Bridgeman crystal growth techniques.
As it is arsenic bearing, precautions in handling and working should be observed.
REFERENCES:
(1) Handbook Optical Constants, ed Palik, V1, ISBN 0-12-544420-6
(2) Deutch, J.Electron. Mater. V4 p679
(3) Sze, Physics of Semiconductor Devices, Wiley 1981
(4) M.Cadona. Proc. Int Conf. Semi. Phys. 1960 p.388. Note: dn/dT = n x (4.5 +/-0.2)x10-5 °K-1