Describing meta-atoms using the exact higher-order polarizability tensors
Abstract
In nanophotonics, multipole framework has become an indispensable theoretical tool for analyzing subwavelength meta-atoms and their radiation properties. This work presents higher-order exact dynamic polarizability (alpha) tensors, which can fully represent anisotropic meta-atoms with higher-order multipole transitions. By using the irreducible exact Cartesian multipoles and field components as the basis, the exact alpha-tensor rigorously reflects symmetry information of particles including reciprocity. In addition, the exact alpha-tensor can be obtained from T-matrix simply using basis transformation. Finally, we show that description of meta-atoms using alpha-tensors incorporated with multiple-scattering theory vastly extends the applicability of the multipole framework in nanophotonics, allowing accurate and efficient depiction of complicated, random, multi-scale systems.
Keywords
Cite
@article{arxiv.1910.14386,
title = {Describing meta-atoms using the exact higher-order polarizability tensors},
author = {Jungho Mun and Sunae So and Jaehyuck Jang and Junsuk Rho},
journal= {arXiv preprint arXiv:1910.14386},
year = {2020}
}
Comments
(main: 8 pages, 6 figures) + (appendix: 7 pages, 9 figures)