(C₁₀H₈O₄)_n (Polyethylene terephthalate, PET)

Polymers and photoresists

1 dataset, together covering 0.4–19.94 µm. Default: Zhang et al. 2020: n,k 0.4–20 µm.

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Datasets

Zhang et al. 2020: n,k 0.4–20 µm n,k 0.4–19.94 µm default

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# (C10H8O4)n (Polyethylene terephthalate, PET): Zhang et al. 2020: n,k 0.4–20 µm
mat = ls.fetch_refractiveindex("organic", "polyethylene_terephthalate", "Zhang", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(mat.range_nm)  # (400, 19942) nm
eps = mat.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_0d1d0b75919c/lightsmith"
mat = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(mat.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (polyethylene-terephthalate/zhang-2020).

# ... load mat as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=mat)],
    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 (C10H8O4)n (Polyethylene terephthalate, PET)

Polyethylene (PE, HDPE, LDPE, (C₂H₄)_n) is the most abundantly produced plastic globally, known for its versatile nature and wide array of applications. Chemically composed of repeating ethylene units, polyethylene exists in various densities and molecular weights that result in different material properties. High-density polyethylene (HDPE) is renowned for its rigidity, strength, and impermeability, making it a popular choice for items like bottles, pipes, and containers. On the other hand, low-density polyethylene (LDPE) offers more flexibility and is frequently used in packaging films, plastic bags, and other applications that demand malleability. Optically, polyethylene is generally translucent to opaque, depending on its density and thickness. Its refractive characteristics can be affected by the density, molecular alignment, and crystallinity of the material. In both its high and low-density forms, polyethylene is celebrated for its chemical resistance, low cost, and easy processing, factors that collectively contribute to its ubiquity in the modern world. Variations:

High-density polyethylene (HDPE)
Medium-density polyethylene (MDPE)
Low-density polyethylene (LDPE)
Linear low-density polyethylene (LLDPE)
Cross-linked polyethylene (XLPE/PEX)
Ultra-high-molecular-weight polyethylene (UHMWPE)

Other names: polyethylene_terephthalate, C10H8O4)n (Polyethylene terephthalate, PET, Polyethylene, C₂H₄)_n, PE, HDPE, LDPE, polyethene, poly(methylene)

API: /v1/materials/mat_bbc18c32fd9f · slug polyethylene-terephthalate