
Floquet control of the gain and loss in a
Yi Wu, Bo Zhu, Shu-Fang Hu, Zheng Zhou, Hong-Hua Zhong
Front. Phys. ›› 2017, Vol. 12 ›› Issue (1) : 121102.
Floquet control of the gain and loss in a
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.
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