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.

To install the package with pip, use

pip install treams

If you're using the system wide installed version of python, you might consider the --user option.

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

When using this code please cite:

D. Beutel, I. Fernandez-Corbaton, and C. Rockstuhl, treams - A T-matrix scattering code for nanophotonic computations, arXiv (preprint), 2309.03182 (2023).

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).
• 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).
• 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).

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