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Direction-Dependent Parity-Time Phase Transition and Non-Reciprocal Directional Amplification with Dynamic Gain-Loss Modulation

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arxiv 1806.00544 v1 pith:3KBIDSKX submitted 2018-06-01 physics.optics quant-ph

Direction-Dependent Parity-Time Phase Transition and Non-Reciprocal Directional Amplification with Dynamic Gain-Loss Modulation

Alex Y. Song , Yu Shi , Qian Lin , Shanhui Fan This is my paper
classification physics.optics quant-ph
keywords phasetransitionamplificationdirectiondirection-dependentdirectionaldynamicgain-loss
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We show that a dynamic gain-loss modulation in an optical structure can lead to a direction-dependent parity-time (PT) phase transition. The phase transition can be made thresholdless in the forward direction, and yet remains with a non-zero threshold in the backward direction. As a result, non-reciprocal directional amplification can be realized.

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