Ge2Sb2Te5 (Germanium antimony telluride, GST)

Phase-change materials integrated-photonicsphase-change

2 datasets, together covering 0.3503–32.41 µm. Default: Frantz et al. 2024: n,k 0.350–32.4 µm.

Compare datasets

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

Datasets

Crystal

Frantz et al. 2024: n,k 0.350–32.4 µm n,k 0.3503–32.41 µm default

Amorphous

Frantz et al. 2024: n,k 0.350–29.6 µm n,k 0.3503–29.63 µm

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# Ge2Sb2Te5 (Germanium antimony telluride, GST): Frantz et al. 2024: n,k 0.350–32.4 µm
ge2sb2te5 = ls.fetch_refractiveindex("main", "Ge2Sb2Te5", "Frantz-crystal", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ge2sb2te5.range_nm)  # (350.28, 32406) nm
eps = ge2sb2te5.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_9b2dbf422c1a/lightsmith"
ge2sb2te5 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ge2sb2te5.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (ge2sb2te5/frantz-2024-crystal).

# ... load ge2sb2te5 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ge2sb2te5)],
    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.

About Ge2Sb2Te5 (Germanium antimony telluride, GST)

Germanium antimony telluride (GST) is a phase-change material commonly used in optical data storage and photonic applications due to its remarkable optical properties. This chalcogenide compound exhibits distinct refractive indices in its amorphous and crystalline states, allowing for reversible switching between these phases with the application of heat or laser pulses. This unique characteristic makes GST an essential material in rewritable optical discs, such as DVDs and Blu-rays, as well as in advanced photonic devices. The refractive index of Ge₂Sb₂Te₅ varies significantly with wavelength, making it a versatile material for various optical applications, including waveguides, modulators, and sensors. Additionally, its compatibility with existing semiconductor fabrication processes enables integration into electronic and photonic circuits, paving the way for innovative technologies in data storage and processing.

Other names: Germanium antimony telluride, GST, Germanium antimony telluride, GST, GST-225, GST225

Ge2Sb2Te5 - The Materials Project

API: /v1/materials/mat_4ac3a9ddab45 · slug ge2sb2te5