Free-space Excitation of Resonant Cavities formed from Cloaking Metamaterial

TL;DR

This paper introduces a novel resonant cavity structure made from cloaking metamaterials with apertures, demonstrating efficient free-space excitation of Whispering Gallery Mode analogues through full wave analysis.

Contribution

It presents a new class of resonant structures using cloaking metamaterials with apertures for free-space excitation of WGMs, which was not previously demonstrated.

Findings

Efficient excitation of Whispering Gallery Mode analogues via free-space illumination.

Cloaking metamaterial shells with apertures enable internal resonant modes.

Full wave analysis confirms the feasibility of the proposed structures.

Abstract

We propose a new class of resonant electromagnetic structures, and study their response to free-space illumination. The structures consist of partial cylindrical shells that have cloaking material properties proposed by Pendry et al. These metamaterial shells have apertures that allow the propagation of incident irradiation into an interior resonant cavity. We use full wave time-harmonic analysis to study the field distribution inside the cavity, and show that an analogue of Whispering Gallery Modes (WGMs) can be efficiently excited via free-space illumination.