Brillouin Scattering in Hybrid Optophononic Bragg Micropillar Resonators at 300 GHz

TL;DR

This paper presents a novel monolithic Brillouin generator using a semiconductor micropillar cavity with a nanoacoustic resonator operating at hundreds of GHz, enabling high-frequency Brillouin scattering with potential for integrated photonic applications.

Contribution

It introduces a new hybrid optophononic micropillar resonator design and an optical characterization method for high-frequency Brillouin scattering in a monolithic device.

Findings

Demonstrated Brillouin scattering at 300 GHz in a micropillar resonator.

Developed a measurement protocol optimizing Brillouin generation efficiency.

Showed potential for integration into fibered and on-chip systems.

Abstract

We introduce a monolithic Brillouin generator based on a semiconductor micropillar cavity embedding a high frequency nanoacoustic resonator operating in the hundreds of GHz range. The concept of two nested resonators allows an independent design of the ultrahigh frequency Brillouin spectrum and of the optical device. We develop an optical free-space technique to characterize spontaneous Brillouin scattering in this monolithic device and propose a measurement protocol that maximizes the Brillouin generation efficiency in the presence of optically induced thermal effects. The compact and versatile Brillouin generator studied here could be readily integrated into fibered and on-chip architectures.