Active Perovskite Hyperbolic Metasurface

A special class of anisotropic media, hyperbolic metamaterials and metasurfaces (HMMs), has attracted much attention in recent years due to its unique ability to manipulate and engineer electromagnetic waves on the subwavelength scale. Because all HMM designs require metal-dielectric composites, the unavoidable metal loss at optical frequencies inspired the development of active HMMs, wherein a gain material is incorporated to compensate for the metal loss. Here, we experimentally demonstrate a luminescent active HMM on silicon that operates at near 750 nm, in which the dielectric constituent is composed entirely of a solution-processed metal-halide perovskite gain. We show the extreme anisotropy of the HMM with microphotoluminescence measurements through the observation of high degrees of linear polarization that are greater than 0.8 in both the emission and absorption. Thanks to the facile fabrication, wide-wavelength tunability, and silicon compatibility for our active HMM, this work paves the way toward HMM's integration into on-chip components and, eventually, photonic integrated circuits.