Floquet control of the gain and loss in a PT-symmetric optical coupler
Floquet control of the gain and loss in a PT-symmetric optical coupler作者机构：Department of Physics Engineering University of CAPF Xi'an 710086 China School of Physics and Astronomy Sun Yat-Sen University (Zhuhai Campus) Zhuhai 519082China Institute of Mathematics and Physics Central South University of Forestry and Technology Changsha 410004 China Department of Physics Hunan Institute of Technology Hengyang 421002 China
出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)
年 卷 期：2017年第12卷第1期
页 面：99-105页
核心收录：
学科分类：080903[工学-微电子学与固体电子学] 080801[工学-电机与电器] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学]
基 金：Acknowledgements We acknowledge helpful discussion with Chaohong Lee. This work was supported by the National Natural Science Foundation of China (Grant Nos. 11465008 11574405 and 11426223) the Hunan Provincial Natural Science Foundation (Grant Nos. 2015JJ2114 2015JJ4020 and 14JJ3114) and the Scientific Research Fund of Hunan Provincial Education Department (Grant No. 14A118)
主 题：PT- symmetry periodic modulation optical coupler
摘 要：Controlling the balanced gain and loss in a PT-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 PT-symmetric optical coupler. It is found that the gain and loss of the system can be manipulated by applying a periodic modulation. Purther, 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 PT- symmetry control schemes, our protocol can modulate the unbroken PT-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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