Transformation optics for cavity array metamaterials

TL;DR

This paper introduces a new transformation optics framework tailored for cavity array metamaterials, enabling device design by transforming internal geometry and tuning permittivity, demonstrated through a cloaking example.

Contribution

It develops a novel approach for applying transformation optics to cavity array metamaterials, overcoming size constraints of traditional methods.

Findings

Successfully designed a CAM-based cloak

Demonstrated geometry transformation and permittivity tuning

Provided a practical framework for CAM device engineering

Abstract

Cavity array metamaterials (CAMs), composed of optical microcavities in a lattice coupled via tight-binding interactions, represent a novel architecture for engineering metamaterials. Since the size of the CAMs' constituent elements are commensurate with the operating wavelength of the device, it cannot directly utilise classical transformation optics in the same way as traditional metamaterials. By directly transforming the internal geometry of the system, and locally tuning the permittivity between cavities, we provide an alternative framework suitable for tight-binding implementations of metamaterials. We develop a CAM-based cloak as the case study.