title: High-efficiency acousto-optic coupling in phoxonic resonator based on silicon fishbone nanobeam cavity.
abstract: We investigate the acousto-optic coupling rates between different acoustic resonance modes and a specified optical resonance mode in a one-dimensional phoxonic crystal fishbone nanobeam formed by periodically arranging semi-cylinders of air on both sides of a suspended silicon waveguide. The gradually tapered unit cells form optical and acoustic resonators. In acousto-optic coupling rate calculation, the acoustic fields and optical fields are obtained by steady state monochromatic analysis and eigen-mode computation, respectively. Results showed that the acoustic polarizations and symmetries of the acoustic resonance modes are dominant factors in the acousto-optic coupling efficiency, and appropriate selection of these parameters can prevent cancellation of acousto-optic interactions, thereby enhancing acousto-optic coupling rates. This study provides important insights that can be applied to acousto-optic device designs.
authors.forename: Chien-Chang
authors.initials: CC
authors.lastname: Chiu
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Chen
authors.forename: Kuen-Wei
authors.initials: KW
authors.lastname: Sung
authors.forename: Fu-Li
authors.initials: FL
authors.lastname: Hsiao