NaI (Sodium iodide)

2 datasets, together covering 0.25–40 µm. Default: Jellison et al. 2012: n 0.436–0.633 µm.

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Tick datasets in the list to add them to the plot (up to 12).

Datasets

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# NaI (Sodium iodide): Jellison et al. 2012: n 0.436–0.633 µm
nai = ls.fetch_refractiveindex("main", "NaI", "Jellison", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(nai.range_nm)  # (436, 633) nm
eps = nai.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_d99b4262258c/lightsmith"
nai = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(nai.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (nai/jellison-2012).

# ... load nai as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=nai)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=436, stop_nm=633, 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"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_d99b4262258c/lightsmith?model=drude_lorentz"
nai_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))

A dispersive Drude–Lorentz model for time-domain solvers.

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.

About NaI (Sodium iodide)

Sodium iodide (NaI) is a white, crystalline solid that can be prepared as transparent crystals suitable for optical applications. Notably, when doped with thallium (NaI:Tl), it becomes a scintillator material, capable of converting incident gamma rays into visible light. This property makes NaI:Tl crystals particularly valuable in radiation detection, gamma spectroscopy, and other nuclear medicine applications. However, NaI, being an alkali halide, is hygroscopic, meaning it readily absorbs moisture from the environment. Therefore, it requires careful handling and storage to prevent degradation, especially if it is to be used in optical systems.

Other names: Sodium iodide

Sodium iodide - Wikipedia

API: /v1/materials/mat_8f1f1046a243 · slug nai