Virtual Parity-Time Symmetry
Parity-time (PT) symmetry has recently been opening exciting directions in photonics, yet the required careful balance of loss and gain has been hindering its widespread applicability. Here, we propose a gain-free route to PT symmetry by extending it to complex-frequency excitations that can mimic g...
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| Veröffentlicht in: | Physical review letters 2020-05, Vol.124 (19), p.193901-193901, Article 193901 |
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| container_end_page | 193901 |
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| container_issue | 19 |
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| container_title | Physical review letters |
| container_volume | 124 |
| creator | Li, Huanan Mekawy, Ahmed Krasnok, Alex Alù, Andrea |
| description | Parity-time (PT) symmetry has recently been opening exciting directions in photonics, yet the required careful balance of loss and gain has been hindering its widespread applicability. Here, we propose a gain-free route to PT symmetry by extending it to complex-frequency excitations that can mimic gain in passive systems. Based on the concept of virtual absorption, extended here to implement also virtual gain, we implement PT symmetry in the complex-frequency plane and realize 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 symmetry and non-Hermitian physics in passive platforms. |
| doi_str_mv | 10.1103/PhysRevLett.124.193901 |
| format | Article |
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| ispartof | Physical review letters, 2020-05, Vol.124 (19), p.193901-193901, Article 193901 |
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| language | eng |
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| source | American Physical Society Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Parity Phase transitions Symmetry |
| title | Virtual Parity-Time Symmetry |
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