Transmittable Nonreciprocal Cloaking

TL;DR

This paper introduces transmittable nonreciprocal cloaking, a novel concept where a cloak can hide objects from external view while selectively transmitting light outward from its center, enabling new applications in stealth and illusion.

Contribution

The paper presents the first implementation of a nonreciprocal cloaking system using concentric bianisotropic metasurfaces that can block inward waves and transmit outward waves selectively.

Findings

Demonstrated a cloaking device that blocks inward waves and transmits outward waves.

Showed the cloaking system operates omnidirectionally externally and directionally outward.

Potential applications include stealth, illusion, and cooling.

Abstract

Cloaking is typically reciprocal. We introduce here the concept of \emph{transmittable nonreciprocal cloaking} whereby the cloaking system operates as a standard omnidirectional cloak for external illumination, but can transmit light from its center outwards at will. We demonstrate a specific implementation of such cloaking that consists in a set of concentric bianisotropic metasurfaces whose innermost element is nonreciprocal and designed to simultaneously block inward waves and pass -- either omnidirectionaly or directionally -- outward waves. Such cloaking represents a fundamental diversification of conventional cloaking and may find applications in areas such as stealth, blockage avoidance, illusion and cooling.