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# treams

The package `treams` provides a framework to simplify computations of the
electromagnetic scattering of waves at finite and at periodic arrangements of particles
based on the T-matrix method.

## Installation

### Installation using pip

To install the package with pip, use

```sh
pip install treams
```

This will make sure to also install all required dependencies (i.e. `numpy` and `scipy`). Please ignore the `requirements.txt`, as they only serve to instruct binder which packages to install to run the documentation notebooks interactively.
If you're using the system wide installed version of python, you might consider the
``--user`` option.

## Documentation

The documentation can be found at https://tfp-photonics.github.io/treams.

## Publications

When using this code please cite:

[D. Beutel, I. Fernandez-Corbaton, and C. Rockstuhl, treams – a T-matrix-based scattering code for nanophotonics, Comp. Phys. Commun. 297, 109076 (2024).](https://doi.org/10.1016/j.cpc.2023.109076)

Other relevant publications are
* [D. Beutel, I. Fernandez-Corbaton, and C. Rockstuhl, Unified Lattice Sums Accommodating Multiple Sublattices for Solutions of the Helmholtz Equation in Two and Three Dimensions, Phys. Rev. A 107, 013508 (2023).](https://doi.org/10.1103/PhysRevA.107.013508)
* [D. Beutel, P. Scott, M. Wegener, C. Rockstuhl, and I. Fernandez-Corbaton, Enhancing the Optical Rotation of Chiral Molecules Using Helicity Preserving All-Dielectric Metasurfaces, Appl. Phys. Lett. 118, 221108 (2021).](https://doi.org/10.1063/5.0050411)
* [D. Beutel, A. Groner, C. Rockstuhl, C. Rockstuhl, and I. Fernandez-Corbaton, Efficient Simulation of Biperiodic, Layered Structures Based on the T-Matrix Method, J. Opt. Soc. Am. B, JOSAB 38, 1782 (2021).](https://doi.org/10.1364/JOSAB.419645)

## Features

* [x] T-matrix calculations using a spherical or cylindrical wave basis set
* [x] Calculations in helicity and parity (TE/TM) basis
* [x] Scattering from clusters of particles
* [x] Scattering from particles and clusters arranged in 3d-, 2d-, and 1d-lattices
* [x] Calculation of light propagation in stratified media
* [x] Band calculation in crystal structures

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