Suspended Z-cut lithium niobate waveguides for stimulated Brillouin scattering

Abstract

On-chip stimulated Brillouin scattering (SBS) has recently been demonstrated in thin-film lithium niobate (TFLN), an emerging material platform for integrated photonics offering large electro-optic and nonlinear properties. While previous work on SBS in TFLN have focused on surface SBS, in this contribution we experimentally demonstrate, for the first time, backward intra-modal SBS generation in suspended Z-cut TFLN waveguides. Our results show trapping of multiple acoustic modes in this structure, featuring a multi-peak Brillouin gain spectrum due to the excitation of higher-order acoustic modes. The findings expand the TFLN waveguide platform exploration for SBS interactions and provide a crucial step towards realizing optical processors for microwave signals or sensors integrated on TFLN.

References in corpus (12)

• Interaction between light and highly confined hypersound in a silicon photonic nanowire
• Tailorable Stimulated Brillouin Scattering in Nanoscale Silicon Waveguides
• Large Brillouin Amplification in Silicon
• Stimulated Brillouin Scattering in integrated photonic waveguides: forces, scattering mechanisms and coupled mode analysis
• Observation of stimulated Brillouin scattering in silicon nitride integrated waveguides
• Acoustic confinement and Stimulated Brillouin Scattering in integrated optical waveguides
• Net on-chip Brillouin gain based on suspended silicon nanowires
• A Hamiltonian treatment of stimulated Brillouin scattering in nanoscale integrated waveguides
• Stimulated Brillouin scattering by surface acoustic waves in lithium niobate waveguides
• NumBAT: The integrated, open source Numerical Brillouin Analysis Tool
• On-Chip Stimulated Brillouin Scattering via Surface Acoustic Waves
• Cross-Polarized Stimulated Brillouin Scattering in Lithium Niobate Waveguides