Luo Xiaobing, Huang Jiahao, Zhong Honghua, Qin Xizhou, Xie Qiongtao, Kivshar Yuri S, Lee Chaohong
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China and Department of Physics, Jinggangshan University, Ji'an 343009, China.
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
Phys Rev Lett. 2013 Jun 14;110(24):243902. doi: 10.1103/PhysRevLett.110.243902.
We introduce a novel concept of the pseudo-parity-time (pseudo-PT) symmetry in periodically modulated optical systems with balanced gain and loss. We demonstrate that whether or not the original system is PT symmetric, we can manipulate the property of the PT symmetry by applying a periodic modulation in such a way that the effective system derived by the high-frequency Floquet method is PT symmetric. If the original system is non-PT symmetric, the PT symmetry in the effective system will lead to quasistationary propagation that can be associated with the pseudo-PT symmetry. Our results provide a promising approach for manipulating the PT symmetry of realistic systems.
我们在具有平衡增益和损耗的周期性调制光学系统中引入了伪宇称时间(pseudo-PT)对称的新概念。我们证明,无论原始系统是否为PT对称,我们都可以通过施加周期性调制来操纵PT对称的性质,使得通过高频弗洛凯方法导出的有效系统是PT对称的。如果原始系统是非PT对称的,有效系统中的PT对称将导致准稳态传播,这可以与伪PT对称相关联。我们的结果为操纵实际系统的PT对称提供了一种有前景的方法。