Abstract

An evanescently coupled optomechanical system is developed, in which a SiN nanomechanical oscillator couples to the evanescent field of whispering gallery optical modes in a slightly deformed silica microsphere. The evanescent optomechanical coupling length varies strongly along the whispering gallery optical path, with the maximum coupling length nearly three times that of a regular optical resonator. The deformed resonator also allows efficient free-space evanescent excitation of whispering gallery optical modes. These unique features enable a relatively simple and robust implementation of evanescently coupled optomechanical systems.

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