Optical nonreciprocity in a piezo-optomechanical system**Project supported by the National Natural Science Foundation of China (Grant Nos. 61941501, 61775062, 11574092, 61378012, and 91121023), the Doctoral Program of Guangdong Natural Science Foundation, China (Grant No. 2018A030310109), the Doctoral Project of Guangdong Medical University, China (Grant No. B2017019), and the Open Project of the Key Laboratory of Low Dimensional Quantum Structures and

Abstract

We theoretically study the optical nonreciprocity in a piezo-optomechanical microdisk resonator, in which the cavity modes and the mechanical mode are optically pumped and piezoelectrically driven, respectively. For asymmetric optical pumping and different piezoelectrical drivings, our system shows some nonreciprocal optical responses. We find that our system can function as an optical isolator, a nonreciprocal amplifier, or a nonreciprocal phase shifter.