Stimulated Brillouin scattering by surface acoustic waves in lithium niobate waveguides
Caíque C. Rodrigues, Roberto O. Zurita, Thiago P. Mayer Alegre, Gustavo S. Wiederhecker
Abstract
We numerically demonstrate that lithium niobate on insulator (LNOI) waveguides may support confined short-wavelength surface acoustic waves that interact strongly with optical fields through backward-stimulated Brillouin scattering in both Z - and X -cut orientation. We conduct fully anisotropic simulations that consider not only moving boundary and photoelastic forces, but also roto-optic forces for the Brillouin interaction. Our results indicate that photoelasticity dominates the Brillouin gain and can reach as high as G B / Q m =0.43W −1 m −1 in standard ridge waveguides.
Topics & Concepts
Brillouin scatteringLithium niobateBrillouin zoneOpticsPhotoelasticityAnisotropyWavelengthScatteringAcoustic waveMaterials scienceOptical fiberPhysicsSolid mechanicsComposite materialPhotorefractive and Nonlinear OpticsMechanical and Optical ResonatorsPhotonic and Optical Devices