High-efficiency acousto-optical interaction in phoxonic nanobeam waveguide

Fu Li Hsiao, Cheng Yi Hsieh, Hao Yu Hsieh, Chien Chang Chiu

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Abstract

We demonstrate the simultaneous existence of slow photonic and phononic modes in phoxonic nanobeam. The phoxonic nanobeam is formed by arranging air semi-cylinders along lateral sides of a suspended silicon waveguide. Because of the slow group velocities, the acousto-optical interactions are dramatically enhanced. The efficiencies of interaction are strongly related to the polarizations of both slow photonic and phononic modes. Our proposed structure is a potential high-efficiency acousto-optical modulator with ultra-small footprint size. The operating optical wavelength is about 1550 nm, while the acoustic frequency is about 6.8 GHz.

Original languageEnglish
Article number171103
JournalApplied Physics Letters
Volume100
Issue number17
DOIs
Publication statusPublished - 2012 Apr 23

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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