AuAl₂ (Gold-aluminium intermetallic, Purple plague)

Metals and conductors

2 datasets, together covering 0.22–1.32 µm. Default: Chen and Lynch 1988: n,k 0.22–0.79 µm.

Compare datasets

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

Datasets

Bulk

Chen and Lynch 1988: n,k 0.22–0.79 µm n,k 0.22–0.79 µm default

Thin film

Supansomboon et al. 2008: n,k 0.300–1.32 µm n,k 0.3–1.32 µm

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# AuAl2 (Gold-aluminium intermetallic, Purple plague): Chen and Lynch 1988: n,k 0.22–0.79 µm
aual2 = ls.fetch_refractiveindex("other", "AuAl2", "Chen", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(aual2.range_nm)  # (220, 790) nm
eps = aual2.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_c95e68777f89/lightsmith"
aual2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(aual2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (aual2/chen-lynch-1988).

# ... load aual2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=aual2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=790, 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.

About AuAl2 (Gold-aluminium intermetallic, Purple plague)

Other names: Gold-aluminium intermetallic, Purple plague, Gold-aluminium intermetallic, Purple plague, Purple death, Roberts-Austen's purple gold, Purple gold

API: /v1/materials/mat_f1268a7e5d6c · slug aual2