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This study introduces a gain-free method for achieving Parity-Time (PT) symmetry in passive photonic systems using complex-frequency excitations. This breakthrough enables stable realization of PT symmetry

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Area of Science:

  • Photonics
  • Non-Hermitian physics
  • Complex-frequency dynamics

Background:

  • Parity-Time (PT) symmetry offers novel photonic functionalities but requires active gain-loss elements, limiting stability and applicability.
  • Achieving PT symmetry typically necessitates a precise balance between optical gain and loss, posing significant experimental challenges.

Purpose of the Study:

  • To propose and demonstrate a novel, gain-free approach to realizing Parity-Time (PT) symmetry in passive photonic systems.
  • To extend the concept of virtual absorption to mimic gain, enabling PT symmetry in inherently stable, passive platforms.
  • To showcase landmark PT symmetry effects, such as broken phase transitions and anisotropic resonances, without active components.

Main Methods:

  • Utilizing complex-frequency excitations to emulate gain in a passive system.
  • Extending the principle of virtual absorption to incorporate virtual gain.
  • Implementing PT symmetry within the complex-frequency domain.
  • Experimentally realizing PT symmetry effects in a fully passive optical setup.

Main Results:

  • Demonstration of PT symmetry and its characteristic effects in a completely passive system.
  • Observation of broken phase transitions and anisotropic transmission resonances without gain.
  • Successful implementation of passive laser-absorber pairs.
  • Validation of complex-frequency excitations as a viable route to PT symmetry.

Conclusions:

  • The proposed gain-free method provides a stable and practical pathway to implementing PT symmetry in photonics.
  • This work opens new avenues for exploring non-Hermitian physics in passive optical platforms.
  • The findings pave the way for the widespread adoption of PT symmetry and its unique phenomena in real-world photonic devices.