Virtual Parity-Time Symmetry [article]

Huanan Li, Ahmed Mekawy, Alex Krasnok, Andrea Alù
2019 arXiv   pre-print
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
more » ... mission 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.
arXiv:1911.12875v1 fatcat:q4jak67kcndy5a5z4luvldrnxy