Bi₁₂GeO₂₀ (Bismuth germanate, BGO)

Glasses, oxides and dielectrics

1 dataset, together covering 0.45–0.7 µm. Default: Simon et al. 1997: n 0.45–0.70 µm.

Compare datasets

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

Datasets

Simon et al. 1997: n 0.45–0.70 µm n 0.45–0.7 µm default

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# Bi12GeO20 (Bismuth germanate, BGO): Simon et al. 1997: n 0.45–0.70 µm
bi12geo20 = ls.fetch_refractiveindex("main", "Bi12GeO20", "Simon", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(bi12geo20.range_nm)  # (450, 700) nm
eps = bi12geo20.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_bc83dbdc3936/lightsmith"
bi12geo20 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(bi12geo20.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (bi12geo20/simon-1997).

# ... load bi12geo20 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=bi12geo20)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=450, stop_nm=700, 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_bc83dbdc3936/lightsmith?model=drude_lorentz"
bi12geo20_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 Bi12GeO20 (Bismuth germanate, BGO)

Bi₁₂GeO₂₀, also abbreviated as BGO but distinct from bismuth germanate, is a bismuth germanium oxide compound known for its fascinating electro-optic and acousto-optic properties. It is primarily used in applications requiring high-speed modulation and deflection of light, such as in Q-switching of lasers, optical data storage, and light modulation for telecommunications. The crystal structure of Bi₁₂GeO₂₀ contributes to its large electro-optic and acousto-optic coefficients, making it one of the preferred materials for devices that require fast and efficient control of optical signals. It is also used in piezoelectric applications and has been explored for its potential as a photorefractive material. The crystal can be grown using techniques like the Czochralski method, and its optical properties can be fine-tuned through doping or altering growth conditions. Although it is less common than other electro-optic materials like lithium niobate, its unique combination of properties, such as high optical damage threshold and good thermal stability, make it a valuable material for specialized optical applications.

Other names: Bismuth germanate, BGO, Bismuth germanium oxide, BGO, Bismuth germanate

API: /v1/materials/mat_b1d37ba35fef · slug bi12geo20