High-efficiency acousto-optic coupling in phoxonic resonator based on silicon fishbone nanobeam cavity

Chien Chang Chiu, Wei Min Chen, Kuen Wei Sung, Fu Li Hsiao

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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.

Original languageEnglish
Pages (from-to)6076-6091
Number of pages16
JournalOptics Express
Volume25
Issue number6
DOIs
Publication statusPublished - 2017 Mar 20

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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