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Super-Resonant Intracavity Coherent Absorption.

P Malara1, C E Campanella2, A Giorgini1

  • 1Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34, Comprensorio A. Olivetti, Pozzuoli, NA, Italy.

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Summary
This summary is machine-generated.

Researchers combined resonant interaction and coherent perfect absorption (CPA) to overcome optical resonator limits. This super-resonant coherent absorption enhances light-matter interaction length without needing ultrahigh-quality factors, benefiting spectroscopy and sensing.

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Area of Science:

  • Photonics and Optical Engineering
  • Quantum Optics

Background:

  • Optical resonators enhance light-matter interaction via multipass effects, but this is limited by resonator quality factor (Q-factor).
  • Conventional resonant absorption is constrained by the intrinsic losses and Q-factor limitations of optical cavities.

Purpose of the Study:

  • To demonstrate and investigate a novel phenomenon, super-resonant coherent absorption, in a coupled optical cavity system.
  • To overcome the limitations imposed by the quality factor of individual optical resonators in enhancing light-matter interaction.
  • To explore a new pathway for enhancing sensitivity in optical sensing and spectroscopy.

Main Methods:

  • Utilizing a coupled Fabry-Perot (FP)/ring cavity structure.
  • Investigating the phenomenon of super-resonant coherent absorption at FP resonant wavelengths.
  • Analyzing the behavior of split resonant modes and their dependence on intracavity loss.

Main Results:

  • Observed split modes at FP resonant wavelengths: one nearly transparent, the other highly sensitive to intracavity loss.
  • Demonstrated that for small losses, effective interaction pathlength scales with the ratio and product of individual resonator finesse coefficients.
  • Showcased an effective interaction pathlength enhancement beyond the limits of individual resonator quality factors.

Conclusions:

  • Super-resonant coherent absorption offers a method to circumvent the technological limitations of ultrahigh-quality resonators.
  • This approach extends the conventional definition of resonant absorption by leveraging coupled cavity dynamics.
  • The findings pave the way for advanced spectroscopy and optical sensing schemes with enhanced sensitivity.