Nonlinear suppression of time-reversals in PT-symmetric optical couplers

Details Nonlinear suppression of time-reversals in PT-symmetric optical couplers Nonlinear suppression of time-reversals in PT-symmetric optical couplers

2010-09-28

arxiv.org/abs/1009.5428v1

Phys.Rev.A82:043818,2010

Physics

Optics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevA.82.043818

We reveal a generic connection between the effect of time-reversals and nonlinear wave dynamics in systems with parity-time (PT) symmetry, considering a symmetric optical coupler with balanced gain and loss where these effects can be readily observed experimentally. We show that for intensities below a threshold level, the amplitudes oscillate between the waveguides, and the effects of gain and loss are exactly compensated after each period due to {periodic time-reversals}. For intensities above a threshold level, nonlinearity suppresses periodic time-reversals leading to the symmetry breaking and a sharp beam switching to the waveguide with gain. Another nontrivial consequence of linear PT-symmetry is that the threshold intensity remains the same when the input intensities at waveguides with loss and gain are exchanged.

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