Cross-Polarized Stimulated Brillouin Scattering in Lithium Niobate Waveguides
Caíque C. Rodrigues, Nick J. Schilder, Roberto O. Zurita, Letícia Magalhães, Amirhassan Shams‐Ansari, Felipe J. L. dos Santos, Otávio M. Paiano, Thiago P. Mayer Alegre, Marko Lončar, Gustavo S. Wiederhecker
Abstract
We report on the experimental demonstration of cross-polarization backward stimulated Brillouin scattering (BSBS) in lithium niobate on insulator (LNOI) waveguides. Performing polarization-sensitive pump and probe measurements, we captured both intra- and intermodal scattering between counterpropagating fundamental optical modes. Remarkably, cross-polarization scattering achieved SBS gains that exceeded G_{B}=80 m^{-1} W^{-1}. This substantial gain not only broadens the utility of polarization in SBS but also paves the way for high-performance devices, including ultranarrowband lasers, robust broadband nonreciprocal devices, RF filters, and microwave-to-optical converters.