Photonics in highly dispersive media: The exact modal expansion
Fr\'ed\'eric Zolla, Andr\'e Nicolet, Guillaume Dem\'esy
TL;DR
This paper introduces exact modal expansion formulas for photonic systems with highly dispersive media, accommodating complex media properties and demonstrating efficiency through a plasmonic test case.
Contribution
It provides a general, exact modal expansion method for dispersive, anisotropic, and non-reciprocal media using a simplified Keldysh theorem.
Findings
Formulas applicable to complex dispersive media
Numerical efficiency demonstrated with a plasmonic test case
Handles anisotropic and non-reciprocal media
Abstract
We present exact modal expansions for photonic systems including highly dispersive media. The formulas, based on a simple version of the Keldysh theorem, are very general since both permeability and permittivity can be dispersive, anisotropic, and even possibly non reciprocal. A simple dispersive test case where both plasmonic and geometrical resonances strongly interact exemplifies the numerical efficiency of our approach.
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