Brillouin-Active Subwavelength Silicon Membrane Waveguides

On-chip Brillouin scattering plays a key role in numerous applications in the domain of signal processing and microwave photonics due to the coherent bidirectional coupling between near-infrared optical signals and GHz mechanical modes. Here, we propose and demonstrate a novel subwavelength waveguide design to achieve narrow linewidth and strong optomechanical interaction. We experimentally demonstrate optomechanical coupling with 5–8 MHz …