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 ${G_B}/\!{Q_m} = 0.43 \;{{\rm W}^{- 1}}{{\rm m}^{- 1}}$ in standard ridge waveguides.

© 2023 Optica Publishing Group

Acoustic confinement and stimulated Brillouin scattering in integrated optical waveguides

Christopher G. Poulton, Ravi Pant, and Benjamin J. Eggleton
J. Opt. Soc. Am. B 30(10) 2657-2664 (2013)

Designing of strongly confined short-wave Brillouin phonons in silicon waveguide periodic lattices

Roberto O. Zurita, Gustavo S. Wiederhecker, and Thiago P. Mayer Alegre
Opt. Express 29(2) 1736-1748 (2021)

Enhanced stimulated Brillouin scattering in the unsuspended silicon waveguide assisted with genetic algorithms

Peng Li, Shumeng Wang, Goran Z. Mashanovich, Jun-Yu Ou, and Jize Yan
Opt. Express 31(10) 16162-16177 (2023)

Theoretical analysis of the influence of crystalline orientation on Brillouin gain of whispering gallery mode resonators

Jingyi Tian and Guoping Lin
J. Opt. Soc. Am. B 41(3) 712-719 (2024)

Optimizing performance for an on-chip stimulated Brillouin scattering-based isolator

Choon Kong Lai, Moritz Merklein, Alvaro Casas-Bedoya, Yang Liu, Stephen J. Madden, Christopher G. Poulton, Michael J. Steel, and Benjamin J. Eggleton
J. Opt. Soc. Am. B 40(3) 523-534 (2023)