Optical constants
Refractive index of Ir (Iridium)
Roberts 1986: n,k 0.250–0.750 µm
- Data
- tabulated nk
- Range
- 0.25–0.75 µm
- Points
- 51
- State
- polycrystalline
- Licence
- CC0-1.0
Plot
Click the plot to set the calculator wavelength.
At one wavelength
- Refractive index n
- 2.30716
- Extinction coefficient k
- 4.93304
- Permittivity ε1
- -19.0119
- Permittivity ε2
- 22.7626
- Absorption coefficient α
- 1.05498e+06 cm⁻¹
- Penetration depth δ = λ/(2πk)
- 18.9578 nm
- Abbe number Vd
- —
- Chromatic dispersion dn/dλ
- 4.1 µm⁻¹
- Group index ng
- -0.102
- Group velocity dispersion
- — fs²/mm
- Dispersion parameter D
- — ps/(nm·km)
- Photon energy
- 2.11001 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
# Ir (Iridium): Roberts 1986: n,k 0.250–0.750 µm
ir = ls.fetch_refractiveindex("main", "Ir", "Roberts", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ir.range_nm) # (250, 750) nm
eps = ir.eps([633]) # 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_38bf0a471348/lightsmith"
ir = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ir.source) # citation and provenance travel with the dataAny dataset here, as the library's Tabulated material (ir/roberts-1986).
# ... load ir as above, then:
sim = ls.Simulation(
particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ir)],
medium_index=1.0,
wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=750, 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
- no primary reference in the source file
References
Cite
Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)
Data
51 rows as published| λ (µm) | n | k |
|---|---|---|
| 0.25 | 1.701 | 3.882 |
| 0.26 | 1.569 | 3.687 |
| 0.27 | 1.416 | 3.369 |
| 0.28 | 1.394 | 3.247 |
| 0.29 | 1.415 | 3.113 |
| 0.3 | 1.452 | 3.077 |
| 0.31 | 1.482 | 3.039 |
| 0.32 | 1.501 | 3.042 |
| 0.33 | 1.485 | 3.064 |
| 0.34 | 1.473 | 3.12 |
| 0.35 | 1.469 | 3.201 |
| 0.36 | 1.476 | 3.283 |
| 0.37 | 1.498 | 3.38 |
| 0.38 | 1.523 | 3.464 |
| 0.39 | 1.563 | 3.549 |
| 0.4 | 1.599 | 3.624 |
| 0.41 | 1.636 | 3.704 |
| 0.42 | 1.667 | 3.77 |
| 0.43 | 1.698 | 3.845 |
| 0.44 | 1.725 | 3.913 |
| 0.45 | 1.757 | 3.992 |
| 0.46 | 1.78 | 4.083 |
| 0.47 | 1.813 | 4.141 |
| 0.48 | 1.847 | 4.218 |
| 0.49 | 1.885 | 4.296 |
| 0.5 | 1.924 | 4.371 |
| 0.51 | 1.969 | 4.451 |
| 0.52 | 2.011 | 4.513 |
| 0.53 | 2.059 | 4.584 |
| 0.54 | 2.1 | 4.641 |
| 0.55 | 2.149 | 4.704 |
| 0.56 | 2.187 | 4.754 |
| 0.57 | 2.228 | 4.824 |
| 0.58 | 2.276 | 4.892 |
| 0.59 | 2.317 | 4.946 |
| 0.6 | 2.354 | 4.985 |
| 0.61 | 2.409 | 5.05 |
| 0.62 | 2.431 | 5.083 |
| 0.63 | 2.481 | 5.169 |
| 0.64 | 2.506 | 5.2 |
| 0.65 | 2.531 | 5.234 |
| 0.66 | 2.56 | 5.274 |
| 0.67 | 2.562 | 5.278 |
| 0.68 | 2.615 | 5.357 |
| 0.69 | 2.615 | 5.357 |
| 0.7 | 2.655 | 5.409 |
| 0.71 | 2.656 | 5.421 |
| 0.72 | 2.658 | 5.42 |
| 0.73 | 2.658 | 5.42 |
| 0.74 | 2.625 | 5.381 |
| 0.75 | 2.613 | 5.362 |
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
- —
Solid iridium (Johnson Matthew): polycrystalline, annealed. n,k pairs measured by scanning automatic nulling spectro-ellipsometer. Room temperature.