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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Complex-frequency excitations in photonics and wave physics.

Seunghwi Kim1, Alex Krasnok2, Andrea Alù1,3

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This summary is machine-generated.

Complex frequencies in wave systems can mimic gain and loss without material changes. This approach offers new ways to control wave behavior for applications in metamaterials and computing.

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Area of Science:

  • Wave physics
  • Quantum mechanics
  • Metamaterials

Background:

  • Lossless optical cavities have real resonance frequencies due to Hermitian Hamiltonians.
  • Non-Hermitian systems exhibit complex frequencies, enabling exotic scattering phenomena via engineered gain/loss.
  • Material modifications are typically required to access non-Hermitian responses.

Purpose of the Study:

  • To review theoretical and experimental advances in non-Hermitian wave systems.
  • To explore the use of complex-valued frequencies for wave manipulation.
  • To highlight opportunities for new applications in sensing, imaging, and computing.

Main Methods:

  • Analysis of theoretical frameworks for non-Hermitian Hamiltonians.
  • Examination of experimental techniques for controlling wave properties.
  • Focus on time-domain excitations mimicking gain and loss.

Main Results:

  • Complex-valued frequencies can effectively simulate gain and loss.
  • This simulation allows access to non-Hermitian phenomena without material modification.
  • Tailored time-domain excitations provide novel wave control mechanisms.

Conclusions:

  • Complex frequencies offer a powerful tool for exploring non-Hermitian physics.
  • This approach bypasses the need for material gain/loss engineering.
  • Significant potential for advancements in metamaterials, imaging, sensing, and computing.