Grating-based microcavity with independent control of resonance energy and linewidth for non-Hermitian polariton system

TL;DR

This paper introduces an experimental approach using microcavities with sub-wavelength gratings to independently control the resonance energy and linewidth of polariton modes, facilitating advanced non-Hermitian physics experiments.

Contribution

The study presents a novel method to independently tune the real and imaginary parts of polariton eigenmodes using grating geometry, enabling flexible non-Hermitian polariton system design.

Findings

Achieved independent control of polariton energy and linewidth.

Demonstrated wide tunability suitable for non-Hermitian physics.

Validated the method through experimental measurements.

Abstract

Exciton-polaritons have become an emerging platform for implementing non-Hermitian physics. The implementation commonly requires control of both the real and imaginary parts of the eigenmodes of the system. We present an experimental method to achieve this purpose using microcavities with sub-wavelength gratings as reflectors. The reflectivity and reflection phase of the grating can be changed by its geometric parameters and they determine the energy and linewidth of the polariton modes. We demonstrate that this method allows a wide range of possible polariton energy and linewidth, suitable for implementing non-Hermitian polariton systems with coupled modes.