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Paper detail

Virtual Parity-Time Symmetry

Parity-time (PT) symmetry has been opening exciting opportunities in optics, yet the required careful balance of loss and gain has been hindering its practical implementations. Here, we propose a gain-free route to PT-symmetry based on non-monochromatic excitations that mimic loss and gain in passive systems. Based on the concept of virtual absorption, extended here to implement also virtual gain, we induce PT-symmetry and its landmark effects, such as broken phase transitions, anisotropic transmission resonances and laser-absorber pairs, in a fully passive, hence inherently stable, system. These results open a path to establish PT-symmetric phenomena in purely passive platforms.

preprint2019arXivOpen access
Huanan LiAhmed MekawyAlex KrasnokAndrea Alù
cond-mat.mes-hallphysics.app-phphysics.optics
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Huanan LiAhmed MekawyAlex KrasnokAndrea Alù

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