CdGeAs₂ (Cadmium germanium arsenide)

Semiconductors and photonic platforms anisotropic

2 datasets, together covering 2.4–11.5 µm. Default: Boyd et al. 1972: n(o) 2.4–11.5 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

# CdGeAs2 (Cadmium germanium arsenide): Boyd et al. 1972: n(o) 2.4–11.5 µm
cdgeas2 = ls.fetch_refractiveindex("main", "CdGeAs2", "Boyd-o", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgeas2.range_nm)  # (2400, 11500) nm
eps = cdgeas2.eps([5250])  # 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_15e28b05201a/lightsmith"
cdgeas2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(cdgeas2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (cdgeas2/boyd-1972-o).

# ... load cdgeas2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=cdgeas2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=2400, stop_nm=11500, 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_15e28b05201a/lightsmith?model=drude_lorentz"
cdgeas2_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 CdGeAs2 (Cadmium germanium arsenide)

Cadmium germanium arsenide (CdGeAs₂) is an inorganic compound that crystallizes in a chalcopyrite structure, exhibiting intriguing optical and optoelectronic properties. It is particularly noteworthy for its significant nonlinear optical coefficients and phase-matching capabilities. This makes CdGeAs₂ a valuable material for frequency conversion applications, such as second-harmonic generation and parametric oscillation, especially in the mid-infrared range. Furthermore, the material's large bandgap allows it to operate at elevated temperatures without significant thermal degradation, making it suitable for harsh environmental conditions. However, the presence of toxic elements like cadmium and arsenic requires special handling precautions and may limit its widespread adoption. CdGeAs₂ can be synthesized through various methods, including Bridgman-Stockbarger and Czochralski techniques, which are employed to yield high-quality single crystals. Given its specialized capabilities in nonlinear optics and durability in challenging conditions, CdGeAs₂ remains a material of particular interest in advanced optical applications.

Other names: Cadmium germanium arsenide

API: /v1/materials/mat_6af9e0e73f03 · slug cdgeas2