Optical constants
Refractive index of AMTIR-6 (AMI)
AMTIR-6: n,k 0.6439–8 µm
- Data
- tabulated nk
- Range
- 0.6439–8 µm
- Points
- 11
- Licence
- CC0-1.0
Plot
Click the plot to set the calculator wavelength.
At one wavelength
- Refractive index n
- 2.42342
- Extinction coefficient k
- 3.19711e-07
- Permittivity ε1
- 5.87297
- Permittivity ε2
- 1.54959e-06
- Absorption coefficient α
- 0.0176987 cm⁻¹
- Penetration depth δ = λ/(2πk)
- 1.13003e+09 nm
- Abbe number Vd
- —
- Chromatic dispersion dn/dλ
- -0.0112621 µm⁻¹
- Group index ng
- 2.44899
- Group velocity dispersion
- — fs²/mm
- Dispersion parameter D
- — ps/(nm·km)
- Photon energy
- 0.546186 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
# AMTIR-6 (AMI): AMTIR-6
ami_amtir_6 = ls.fetch_refractiveindex("specs", "AMI-infrared", "AMTIR-6", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ami_amtir_6.range_nm) # (643.9, 8000) nm
eps = ami_amtir_6.eps([2270]) # 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_6eccd13e27cd/lightsmith"
ami_amtir_6 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ami_amtir_6.source) # citation and provenance travel with the dataAny dataset here, as the library's Tabulated material (ami-amtir-6/ami).
# ... load ami_amtir_6 as above, then:
sim = ls.Simulation(
particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ami_amtir_6)],
medium_index=1.0,
wavelengths=ls.WavelengthRange(start_nm=644, stop_nm=1000, 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.
References
Cite
Amorphous Materials AMTIR-6 Information (2012) - downloaded 2014-01-11; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)
Data
11 rows as published| λ (µm) | n | k |
|---|---|---|
| 0.6439 | 2.5976 | 2.1521e-06 |
| 0.7065 | 2.5586 | 7.3088e-07 |
| 1.014 | 2.4757 | 8.0692e-08 |
| 1.53 | 2.438 | 1.2175e-07 |
| 1.97 | 2.4268 | 1.5677e-07 |
| 3.0 | 2.4152 | 7.162e-07 |
| 4.0 | 2.4116 | 9.5493e-07 |
| 5.0 | 2.4074 | 2.3873e-07 |
| 6.0 | 2.4034 | 2.3873e-07 |
| 7.0 | 2.3989 | 1.1141e-06 |
| 8.0 | 2.3937 | 2.2918e-06 |
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
- —