Optical nonreciprocity in a piezo-optomechanical system
Xiao Yu-Ming1, Liu Jun-Hao1, Wu Qin3, Yu Ya-Fei1, †, Zhang Zhi-Ming2, ‡
       

The phase difference |θa − θc| as a function of δ/κ. The parameters are the same as those in Fig. 3(e).