Optical constants

Refractive index of Os (Osmium)

Windt et al. 1988: n,k 0.0024–0.122 µm

Data: tabulated nk
Range: 0.00236–0.1216 µm
Points: 36
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 0.887865
Extinction coefficient k: 0.104799

Permittivity ε₁: 0.777322
Permittivity ε₂: 0.186095

Absorption coefficient α: 779255 cm⁻¹
Penetration depth δ = λ/(2πk): 25.6655 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -7.77159 µm⁻¹

Group index n_g: 1.01921
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 73.3634 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

# Os (Osmium): Windt et al. 1988: n,k 0.0024–0.122 µm
os = ls.fetch_refractiveindex("main", "Os", "Windt", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(os.range_nm)  # (2.36, 121.57) nm
eps = os.eps([16.9])  # 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_67bda8afb414/lightsmith"
os = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(os.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (os/windt-1988).

# ... load os as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=os)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=3, stop_nm=121, 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.

References

D. L. Windt, W. C. Cash, M. Scott, P. Arendt, B. Newnam, R. F. Fisher, A. B. Swartzlander. Optical constants for thin films of Ti, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Ir, Os, Pt, and Au from 24 Å to 1216 Å. Appl. Opt. 27, 246-278 (1988)

doi:10.1364/ao.27.000246 Optical constants for thin films of Ti, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Ir, Os, Pt, and Au from 24 Å to 1216 Å, Applied Optics (1988)

Cite

David L. Windt et al.. Optical constants for thin films of Ti, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Ir, Os, Pt, and Au from 24 Å to 1216 Å. Applied Optics, 27, 246 (1988), doi:10.1364/ao.27.000246; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

36 rows as published

CSV comma separated TXT tab separated YAML n, k Full database record original YAML All quantities CSV JSON metadata

Os (Osmium), Windt et al. 1988: n,k 0.0024–0.122 µm: n and k versus wavelength
λ (µm)	n	k
0.00236	0.99605	0.00245
0.00316	0.99514	0.00381
0.00447	0.99273	0.00792
0.00676	0.9863	0.0138
0.0114	0.9524	0.0193
0.01355	0.9139	0.0322
0.01714	0.886	0.11
0.0243	0.883	0.221
0.02563	0.86	0.229
0.03038	0.84	0.111
0.0327	0.753	0.196
0.03568	0.703	0.222
0.03793	0.663	0.339
0.04059	0.638	0.363
0.04478	0.631	0.511
0.04607	0.623	0.565
0.04895	0.688	0.684
0.05391	0.75	0.784
0.05843	0.809	0.902
0.06163	0.805	0.881
0.06714	0.961	0.949
0.07185	1.03	0.931
0.07359	1.09	0.91
0.07437	1.15	0.927
0.08345	1.09	0.887
0.0878	1.03	0.876
0.09198	1.08	0.91
0.09321	1.15	0.964
0.09888	1.15	0.953
0.10258	1.26	1.02
0.10482	1.21	0.988
0.10667	1.14	0.954
0.10857	1.16	0.943
0.1135	1.16	0.929
0.12007	1.25	0.946
0.12157	1.26	0.982

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: —

Os (Osmium): all datasets

About Os (Osmium)

Osmium (Os) is a dense, bluish-white transition metal that belongs to the platinum group in the periodic table. It is the densest naturally occurring element, with a density of around 22.59 g/cm³. Osmium has a very high melting point and is one of the least reactive elements. It is mostly used in alloys with other platinum group metals, enhancing hardness and durability. Due to its hardness, it's often used for the tips of instrument pivots, as well as electrical contacts. In the realm of optics, osmium's primary use has been as osmium tetroxide, which serves as a staining agent for biological samples in electron microscopy. However, osmium itself, being opaque, does not have notable optical applications. Safety note: Osmium tetroxide is highly toxic and should be handled with extreme care.

More about Os (Osmium) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/Os/nk/Windt.yml
ID: ds_67bda8afb414
API: /v1/datasets/ds_67bda8afb414

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