Optical constants

Refractive index of GaAs (Gallium arsenide)

Franta et al. 2026: n,k 0.952–400 µm; 440 K

Data
tabulated nk
Range
0.9521–399.6 µm
Points
6282
Temperature
440 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.9521–399.6 µm
Refractive index n
3.20999
Extinction coefficient k
0.00658255
Permittivity ε1
10.304
Permittivity ε2
0.0422599
Absorption coefficient α
42.4199 cm⁻¹
Penetration depth δ = λ/(2πk)
471477 nm
Abbe number Vd
—
Chromatic dispersion dn/dλ
-0.0194038 µm⁻¹
Group index ng
3.58837
Group velocity dispersion
— fs²/mm
Dispersion parameter D
— ps/(nm·km)
Photon energy
0.0635816 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 (Gallium arsenide): Franta et al. 2026: n,k 0.952–400 µm; 440 K
gaas = ls.fetch_refractiveindex("main", "GaAs", "Franta-440K", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(gaas.range_nm)  # (952.058, 399638) nm
eps = gaas.eps([19500])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

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

Undoped GaAs. Heterogenous data processing combining ellipsometric and spectrophotometric measurements with previously published refractive index. Temperature 440 K.

Conditions

temperature
440 K

References

D. Franta, B. Hroncová, M. Muresan, S. Zollner. Dispersion models describing coupled systems in doped crystals. II. Infrared phonon excitations in GaAs single crystals and phonon-plasmon coupling in Zn-doped GaAs. J. Appl. Phys. 139, 175704 (2026) (Numerical data kindly provided by Daniel Franta)
  • doi:10.1063/5.0314388 Dispersion models describing coupled systems in doped crystals. II. Infrared phonon excitations in GaAs single crystals and phonon–plasmon coupling in Zn-doped GaAs, Journal of Applied Physics (2026)

Cite

Daniel Franta, Beáta Hroncová, Mihai-George Mureșan and Stefan Zollner. Dispersion models describing coupled systems in doped crystals. II. Infrared phonon excitations in GaAs single crystals and phonon–plasmon coupling in Zn-doped GaAs. Journal of Applied Physics, 139, 175704 (2026), doi:10.1063/5.0314388; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

6282 rows as published
GaAs (Gallium arsenide), Franta et al. 2026: n,k 0.952–400 µm; 440 K: n and k versus wavelength
λ (µm)nk
0.9520583.599973747540.0
0.9529743.598863639860.0
0.9538913.597768603960.0
0.9548093.596688140530.0
0.9557273.595621774180.0
0.9566473.594569051970.0
0.9575673.593529542110.0
0.9584883.592502832770.0
0.959413.591488530830.0
0.9603333.590486260910.0
0.9612573.589495664330.0
0.9621823.588516398160.0
0.9631083.587548134390.0
0.9640343.586590559090.0
0.9649623.585643371680.0
0.965893.584706284170.0
0.9668193.583779020560.0
0.9677493.582861316140.0
0.9686813.5819529170.0
0.9696123.581053579380.0
0.9705453.580163069210.0
0.9714793.579281161640.0
0.9724143.578407640530.0
0.9733493.577542298080.0
0.9742853.576684934380.0
0.9752233.575835357040.0
0.9761613.574993380850.0
0.97713.574158827440.0
0.978043.573331524940.0
0.9789813.572511307680.0
0.9799233.571698015930.0
0.9808663.570891495620.0
0.9818093.570091598050.0
0.9827543.569298179720.0
0.9836993.568511102030.0
0.9846463.567730231120.0
0.9855933.566955437620.0
0.9865413.566186596490.0
0.987493.565423586820.0
0.988443.564666291660.0
0.9893913.563914597840.0
0.9903433.563168395840.0
0.9912963.562427579620.0
0.9922493.561692046470.0
0.9932043.560961696910.0
0.9941593.560236434510.0
0.9951163.559516165820.0
0.9960733.558800800210.0
0.9970313.558090249790.0
0.9979913.557384429270.0
0.9989513.556683255920.0
0.9999123.55598664940.0
1.000873.55529453170.0
1.001843.554606827070.0
1.00283.55392346190.0
1.003773.55324436470.0
1.004733.552569465930.0
1.00573.551898698020.0
1.006663.551231995240.0
1.007633.550569293650.0
1.00863.549910531060.0
1.009573.549255646930.0
1.010543.548604582330.0
1.011523.547957279890.0
1.012493.547313683730.0
1.013463.546673739430.0
1.014443.546037393960.0
1.015413.545404595640.0
1.016393.54477529410.0
1.017373.544149440220.0
1.018353.543526986120.0
1.019333.542907885080.0
1.020313.542292091530.0
1.021293.5416795610.0
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1.025233.539261216430.0
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1.043133.528951334990.0
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1.049163.525701590230.0
1.050173.525168256640.0
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1.052193.52410848250.0
1.05323.523581996840.0
1.054223.523057749390.0
1.055233.522535718650.0
1.056253.522015883470.0
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1.058283.52098271720.0
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1.060323.519958089090.0
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1.06443.517933829550.0
1.065433.517432864070.0
1.066453.516933902520.0
1.067483.516436927510.0
1.068513.515941921940.0
1.069533.515448869010.0
1.070563.514957752180.0
1.071593.514468555190.0
1.072623.513981262050.0
1.073653.513495857020.0
1.074693.513012324620.0
1.075723.512530649620.0
1.076763.512050817010.0
1.077793.511572812040.0
1.078833.511096620180.0
1.079873.510622227140.0
1.080913.510149618820.0
1.081953.509678781360.0
1.082993.509209701110.0
1.084033.508742364610.0
1.085073.508276758610.0
1.086123.507812870060.0
1.087163.50735068610.0
1.088213.506890194060.0
1.089253.506431381450.0
1.09033.505974235970.0
1.091353.505518745480.0
1.09243.505064898020.0
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1.095563.50371309680.0
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1.097663.50281989940.0
1.098723.502375668270.0
1.099783.501933001030.0
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1.106143.499309249660.0
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1.11043.497590056680.0
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1.120063.493806032870.0
1.121133.493392571070.0
1.122213.492980475130.0
1.123293.492569736830.0
1.124373.492160348060.0
1.125453.491752300790.0
1.126543.491345587120.0
1.127623.490940199180.0
1.12873.490536129250.0
1.129793.490133369640.0
1.130883.489731912810.0
1.131973.489331751240.0
1.133053.488932877540.0
1.134143.488535284380.0
1.135243.488138964510.0
1.136333.487743910760.0
1.137423.487350116050.0
1.138523.486957573370.0
1.139613.486566275770.0
1.140713.486176216380.0
1.14183.485787388430.0
1.14293.485399785180.0
1.1443.485013399980.0
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1.150623.482720303960.0
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1.16513.47789514030.0
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1.251023.453659709940.0
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Optical transmission calculator

Free-standing sample in vacuum, normal incidence
Method
Transmittance T
—
Reflectance R
—

Fresnel reflection calculator

Direction
Rp
—
Rs
—
R = (Rp+Rs)/2
—
Phase φp
—
Phase φs
—
Brewster angle θB
—
Critical angle θC
—