Anti-resonant acoustic waveguides enabled tailorable Brillouin scattering on chip

• DOI: 10.48550/arxiv.2401.12677
• Publication Date: 2024-01-01
• Authors: Peng Lei; Mingyu Xu; Yunhui Bai; Zhangyuan Chen; Xiaopeng Xie
• Keywords: Optomechanics; Waveguide

Empowering independent control of optical and acoustic modes enhancing the photon-phonon interaction, integrated photonics boosts advancements on-chip stimulated Brillouin scattering (SBS). However, achieving waveguides with low loss, tailorability, easy fabrication remains a challenge. Here, inspired by anti-resonance in hollow-core fibers, we propose suspended anti-resonant (SARAWs) superior confinement high selectivity modes, supporting both forward backward SBS on chip. Furthermore, this structure streamlines design processes. Leveraging advantages SARAWs, have showcased series record-breaking results for within compact footprint silicon-on-insulator platform. For SBS, centimeter-scale SARAW supports large net gain exceeding 6.4 dB. observed an unprecedented frequency shift 27.6 GHz mechanical quality factor up to 1,960 silicon waveguides. This paradigm waveguide propels into new era, unlocking opportunities fields optomechanics, phononic circuits, hybrid quantum systems.