Switchable invisibility of dielectric resonators
Abstract
The study of invisibility of an infinite dielectric rod with high refractive index is based on the two-dimensional Mie scattering problem, and it suggests strong suppression of scattering due to the Fano interference between spectrally broad nonresonant waves and narrow Mie-resonant modes. However, when the dielectric rod has a finite extension, it becomes a resonator supporting the Fabry-Perot modes which introduce additional scattering and eventually destroy the invisibility. Here we reveal that for shorter rods with modest values of the aspect ratio r/L (where r and L are the radius and length of the rod, respectively), the lowest spectral window of the scattering suppression recovers completely, so that even a finite-size resonator may become invisible. We present a direct experimental verification of the concept of switchable invisibility at microwaves using a cylindrical finite-size resonator with high refractive index.
Cite
@article{arxiv.1701.09022,
title = {Switchable invisibility of dielectric resonators},
author = {Mikhail V. Rybin and Kirill B. Samusev and Polina V. Kapitanova and Dmitry S. Filonov and Pavel A. Belov and Yuri S. Kivshar and Mikhail F. Limonov},
journal= {arXiv preprint arXiv:1701.09022},
year = {2017}
}
Comments
6 pages, 6 figures