论文部分内容阅读
We present exact analytical solutions to parity-time(P T) symmetric optical system describing light transport in P T-symmetric optical couplers. We show that light intensity oscillates periodically between two waveguides for unbroken P T-symmetric phase, whereas light always leaves the system from the waveguide experiencing gain when light is initially input at either waveguide experiencing gain or waveguide experiencing loss for broken P T-symmetric phase. These analytical results agree with the recent experimental observation reported by Ru¨ter et al. [Nat. Phys.6(2010) 192]. Besides, we present a scheme for manipulating P T symmetry by applying a periodic modulation. Our results provide an efficient way to control light propagation in periodically modulated P T-symmetric system by tuning the modulation amplitude and frequency.
We present exact analytical solutions to parity-time (PT) symmetric optical system describing light transport in P T-symmetric optical couplers. We show that light intensity oscillates regularly between two waveguides for unbroken P T-symmetric phase, where light always leaves the system from the waveguide experiencing gain when light is initially input at either waveguide experiencing gain or waveguide experiencing loss for broken P T-symmetric phase. These analytical results agree with the recent experimental observation reported by Ru¨ter et al. [Nat. Phys. 6 (2010) 192]., We present a scheme for manipulating PT symmetry by applying a periodic modulation. Our results provide an efficient way to control light propagation in modulated modulated T-symmetric system by tuning the modulation amplitude and frequency.