An engineered planar plasmonic reflector for polaritonic mode confinement
Abstract
It was recently demonstrated that, in deep subwavelength gap resonators coupled to two-dimensional electron gases, coupling to propagating plasmons can lead to energy leakage and prevent the formation of polaritonic resonances. This process, akin to Landau damping, limits the achievable field confinement and thus the value of light-matter coupling strength. In this work, we show how plasmonic subwavelength reflectors can be used to create an artificial energy stopband in the plasmon dispersion, confining them and enabling the recovery of the polaritonic resonances. Using this approach we demonstrate a normalized light-matter coupling ratio of {\Omega}/{\omega} = 0.35 employing a single quantum well with a gap size of {\lambda}/2400 in vacuum.
Cite
@article{arxiv.2212.13482,
title = {An engineered planar plasmonic reflector for polaritonic mode confinement},
author = {Shima Rajabali and Josefine Enkner and Erika Cortese and Mattias Beck and Simone De Liberato and Jérôme Faist and Giacomo Scalari},
journal= {arXiv preprint arXiv:2212.13482},
year = {2023}
}
Comments
13 pages, 3 figures