Floquet control of the gain and loss in a -symmetric optical coupler
Yi Wu1,Bo Zhu2,Shu-Fang Hu3,Zheng Zhou4(),Hong-Hua Zhong3()
1. Department of Physics, Engineering University of CAPF, Xi’an 710086, China 2. School of Physics and Astronomy, Sun Yat-Sen University (Zhuhai Campus), Zhuhai 519082, China 3. Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha 410004, China 4. Department of Physics, Hunan Institute of Technology, Hengyang 421002, China
Controlling the balanced gain and loss in a -symmetric system is a rather challenging task. Utilizing Floquet theory, we explore the constructive role of periodic modulation in controlling the gain and loss of a -symmetric optical coupler. It is found that the gain and loss of the system can be manipulated by applying a periodic modulation. Further, such an original non-Hermitian system can even be modulated into an effective Hermitian system derived by the high-frequency Floquet method. Therefore, compared with other symmetry control schemes, our protocol can modulate the unbroken -symmetric range to a wider parameter region. Our results provide a promising approach for controlling the gain and loss of a realistic system.
. [J]. Frontiers of Physics, 2017, 12(1): 121102.
Yi Wu,Bo Zhu,Shu-Fang Hu,Zheng Zhou,Hong-Hua Zhong. Floquet control of the gain and loss in a -symmetric optical coupler. Front. Phys. , 2017, 12(1): 121102.
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