Optical constants

Refractive index of CsI (Cesium iodide)

Querry 1987: n,k 0.22–167 µm

Data: tabulated nk
Range: 0.22–166.7 µm
Points: 312
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.73824
Extinction coefficient k: 0

Permittivity ε₁: 3.02148
Permittivity ε₂: 0

Absorption coefficient α: 0 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.1 µm⁻¹

Group index n_g: 1.797
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 2.11001 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

# CsI (Cesium iodide): Querry 1987: n,k 0.22–167 µm
csi = ls.fetch_refractiveindex("main", "CsI", "Querry", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(csi.range_nm)  # (220, 166667) nm
eps = csi.eps([633])  # 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_bf02b9a885f4/lightsmith"
csi = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(csi.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (csi/querry-1987).

# ... load csi as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=csi)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, 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

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet, Contractor Report CRDEC-CR-88009 (1987)

Cite

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet, Contractor Report CRDEC-CR-88009 (1987); Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

312 rows as published

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

CsI (Cesium iodide), Querry 1987: n,k 0.22–167 µm: n and k versus wavelength
λ (µm)	n	k
0.22	2.48	0.583
0.24	2.227	0.0
0.26	2.043	0.0
0.28	1.955	0.0
0.3	1.902	0.0
0.32	1.867	0.0
0.34	1.845	0.0
0.36	1.822	0.0
0.38	1.806	0.0
0.4	1.794	0.0
0.42	1.784	0.0
0.44	1.774	0.0
0.46	1.766	0.0
0.48	1.757	0.0
0.5	1.752	0.0
0.52	1.748	0.0
0.54	1.744	0.0
0.56	1.74	0.0
0.58	1.739	0.0
0.6	1.737	0.0
0.62	1.735	0.0
0.64	1.734	0.0
0.66	1.732	0.0
0.68	1.731	0.0
0.7	1.731	0.0
0.72	1.729	0.0
0.74	1.729	0.0
0.76	1.729	0.0
0.78	1.729	0.0
0.8	1.73	0.0
0.82	1.731	0.0
0.84	1.732	0.0
0.86	1.733	0.0
0.88	1.733	0.0
0.9	1.733	0.0
0.92	1.734	0.0
0.94	1.734	0.0
0.96	1.735	0.0
0.98	1.735	0.0
1.0	1.736	0.0
1.02	1.737	0.0
1.04	1.738	0.0
1.06	1.738	0.0
1.08	1.739	0.0
1.1	1.739	0.0
1.12	1.74	0.0
1.14	1.74	0.0
1.16	1.74	0.0
1.18	1.74	0.0
1.2	1.74	0.0
1.22	1.74	0.0
1.24	1.74	0.0
1.26	1.74	0.0
1.28	1.74	0.0
1.3	1.74	0.0
1.32	1.739	0.0
1.34	1.739	0.0
1.36	1.739	0.0
1.38	1.739	0.0
1.4	1.739	0.0
1.42	1.738	0.0
1.44	1.738	0.0
1.46	1.738	0.0
1.48	1.738	0.0
1.5	1.738	0.0
1.52	1.738	0.0
1.54	1.738	0.0
1.56	1.738	0.0
1.58	1.738	0.0
1.6	1.738	0.0
1.62	1.739	0.0
1.64	1.739	0.0
1.66	1.739	0.0
1.68	1.739	0.0
1.7	1.739	0.0
1.72	1.74	0.0
1.74	1.74	0.0
1.76	1.74	0.0
1.78	1.74	0.0
1.8	1.74	0.0
1.82	1.74	0.0
1.84	1.74	0.0
1.86	1.74	0.0
1.88	1.74	0.0
1.9	1.74	0.0
1.92	1.74	0.0
1.94	1.74	0.0
1.96	1.74	0.0
1.98	1.74	0.0
2.0	1.74	0.0
2.02	1.74	0.0
2.04	1.74	0.0
2.06	1.74	0.0
2.08	1.74	0.0
2.1	1.74	0.0
2.12	1.74	0.0
2.14	1.74	0.0
2.16	1.74	0.0
2.18	1.74	0.0
2.2	1.74	0.0
2.22	1.739	0.0
2.24	1.739	0.0
2.26	1.739	0.0
2.28	1.739	0.0
2.3	1.74	0.0
2.32	1.74	0.0
2.34	1.74	0.0
2.36	1.74	0.0
2.38	1.74	0.0
2.4	1.74	0.0
2.42	1.74	0.0
2.44	1.74	0.0
2.46	1.74	0.0
2.48	1.74	0.0
2.5	1.741	0.0
2.5126	1.741	0.0
2.5253	1.741	0.0
2.5381	1.741	0.0
2.551	1.74	0.0
2.5641	1.74	0.0
2.5773	1.74	0.0
2.5907	1.74	0.0
2.6042	1.74	0.0
2.6178	1.74	0.0
2.6316	1.74	0.0
2.6455	1.74	0.0
2.6596	1.74	0.0
2.6738	1.74	0.0
2.6882	1.74	0.0
2.7027	1.739	0.0
2.7174	1.739	0.0
2.7322	1.739	0.0
2.7473	1.739	0.0
2.7624	1.739	0.0
2.7778	1.739	0.0
2.7933	1.739	0.0
2.809	1.739	0.0
2.8249	1.739	0.0
2.8409	1.738	0.0
2.8571	1.738	0.0
2.8736	1.738	0.0
2.8902	1.738	0.0
2.907	1.738	0.0
2.924	1.738	0.0
2.9412	1.738	0.0
2.9586	1.737	0.0
2.9762	1.737	0.0
2.994	1.737	0.0
3.012	1.737	0.0
3.0303	1.737	0.0
3.0488	1.737	0.0
3.0675	1.737	0.0
3.0864	1.737	0.0
3.1056	1.737	0.0
3.125	1.737	0.0
3.1447	1.737	0.0
3.1646	1.737	0.0
3.1847	1.738	0.0
3.2051	1.738	0.0
3.2258	1.738	0.0
3.2468	1.738	0.0
3.268	1.738	0.0
3.2895	1.738	0.0
3.3113	1.738	0.0
3.3333	1.738	0.0
3.3557	1.738	0.0
3.3784	1.738	0.0
3.4014	1.738	0.0
3.4247	1.738	0.0
3.4483	1.738	0.0
3.4722	1.737	0.0
3.4965	1.737	0.0
3.5211	1.737	0.0
3.5461	1.737	0.0
3.5714	1.737	0.0
3.5971	1.737	0.0
3.6232	1.737	0.0
3.6496	1.737	0.0
3.6765	1.737	0.0
3.7037	1.737	0.0
3.7313	1.737	0.0
3.7594	1.737	0.0
3.7879	1.737	0.0
3.8168	1.737	0.0
3.8462	1.737	0.0
3.876	1.737	0.0
3.9063	1.737	0.0
3.937	1.737	0.0
3.9683	1.737	0.0
4.0	1.737	0.0
4.0323	1.737	0.0
4.065	1.737	0.0
4.0984	1.737	0.0
4.1322	1.737	0.0
4.1667	1.737	0.0
4.2017	1.737	0.0
4.2373	1.737	0.0
4.2735	1.737	0.0
4.3103	1.737	0.0
4.3478	1.737	0.0
4.386	1.737	0.0
4.4248	1.737	0.0
4.4643	1.737	0.0
4.5045	1.737	0.0
4.5455	1.737	0.0
4.5872	1.737	0.0
4.6296	1.737	0.0
4.6729	1.737	0.0
4.717	1.737	0.0
4.7619	1.737	0.0
4.8077	1.737	0.0
4.8544	1.737	0.0
4.902	1.737	0.0
4.9505	1.737	0.0
5.0	1.737	0.0
5.0505	1.737	0.0
5.102	1.737	0.0
5.1546	1.737	0.0
5.2083	1.737	0.0
5.2632	1.738	0.0
5.3191	1.738	0.0
5.3763	1.738	0.0
5.4348	1.738	0.0
5.4945	1.738	0.0
5.5556	1.738	0.0
5.618	1.738	0.0
5.6818	1.738	0.0
5.7471	1.738	0.0
5.814	1.738	0.0
5.8824	1.738	0.0
5.9524	1.738	0.0
6.0241	1.738	0.0
6.0976	1.738	0.0
6.1728	1.738	0.0
6.25	1.738	0.0
6.3291	1.738	0.0
6.4103	1.738	0.0
6.4935	1.739	0.0
6.5789	1.739	0.0
6.6667	1.739	0.0
6.7568	1.739	0.0
6.8493	1.739	0.0
6.9444	1.739	0.0
7.0423	1.739	0.0
7.1429	1.739	0.0
7.2464	1.739	0.0
7.3529	1.739	0.0
7.4627	1.739	0.0
7.5758	1.739	0.0
7.6923	1.739	0.0
7.8125	1.739	0.0
7.9365	1.739	0.0
8.0645	1.739	0.0
8.1967	1.739	0.0
8.3333	1.739	0.0
8.4746	1.739	0.0
8.6207	1.739	0.0
8.7719	1.739	0.0
8.9286	1.739	0.0
9.0909	1.739	0.0
9.2593	1.739	0.0
9.434	1.74	0.0
9.6154	1.74	0.0
9.8039	1.74	0.0
10.0	1.74	0.0
10.2041	1.74	0.0
10.4167	1.74	0.0
10.6383	1.74	0.0
10.8696	1.74	0.0
11.1111	1.74	0.0
11.3636	1.739	0.0
11.6279	1.739	0.0
11.9048	1.739	0.0
12.1951	1.739	0.0
12.5	1.739	0.0
12.8205	1.739	0.0
13.1579	1.738	0.0
13.5135	1.738	0.0
13.8889	1.738	0.0
14.2857	1.738	0.0
14.7059	1.738	0.0
15.1515	1.738	0.0
15.625	1.738	0.0
16.129	1.739	0.0
16.6667	1.739	0.0
17.2414	1.739	0.0
17.8571	1.738	0.0
18.5185	1.738	0.0
19.2308	1.738	0.0
20.0	1.737	0.0
20.8333	1.737	0.0
21.7391	1.736	0.0
22.7273	1.735	0.0
23.8095	1.731	0.0
25.0	1.728	0.0
26.3158	1.725	0.0
27.7778	1.721	0.0
29.4118	1.716	0.0
31.25	1.713	0.0
33.3333	1.708	0.0
35.7143	1.701	0.0
38.4615	1.693	0.0
41.6667	1.683	0.0
45.4545	1.67	0.0
50.0	1.651	0.0
55.5556	1.624	0.0
62.5	1.584	0.0
71.4286	1.516	0.001
83.3333	1.385	0.013
100.0	1.037	0.092
125.0	0.484	0.938
166.6667	6.332	7.237

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: —

CsI (Cesium iodide): all datasets

About CsI (Cesium iodide)

Caesium iodide (CsI) is an inorganic compound known for its wide range of applications, from scintillation counters in high-energy physics to the field of medical imaging. This compound forms colorless, water-soluble crystals and has high gamma-ray stopping power, making it particularly useful as a scintillator material. It is also notable for its transparency in the wide spectral range from ultraviolet to long-wavelength infrared, which makes it valuable in infrared optics. In addition, CsI is often used in mass spectrometry as a matrix to help ionize samples. Like other caesium compounds, CsI should be handled with care due to its reactivity and potential health risks associated with iodine and caesium, such as thyroid gland issues and cellular ion channel disruptions. As a result, strict safety protocols are essential for its handling and storage. Overall, CsI is a highly versatile material with a plethora of applications in both scientific research and industrial processes.

Caesium iodide - Wikipedia

More about CsI (Cesium iodide) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/CsI/nk/Querry.yml
ID: ds_bf02b9a885f4
API: /v1/datasets/ds_bf02b9a885f4

Plot