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This study reveals that strong scattering in optical cavities enables high coupling efficiency, contrary to weak-scattering assumptions. Cavity input-output relations can be tailored by controlling scattering strength, demonstrated through polarization-dependent transmission spectra.

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Area of Science:

  • Photonics and optical physics.
  • Quantum optics and cavity quantum electrodynamics.

Background:

  • Cavity input-output relations (CIORs) conventionally use weak-scattering approximations.
  • High coupling efficiency relies on destructive interference in the weak-scattering regime.
  • The off-resonant field is typically unaffected by the cavity under weak scattering.

Purpose of the Study:

  • To investigate CIORs in the strong-scattering regime of whispering gallery resonators.
  • To demonstrate that high coupling efficiency is achievable even when the off-resonant field approaches zero.
  • To propose and experimentally verify the tunability of CIORs by controlling scattering strength.

Main Methods:

  • Theoretical analysis of CIORs in the strong-scattering regime.
  • Utilizing Purcell-enhanced channeling for efficient light coupling.
  • Experimental demonstration with whispering gallery resonator-waveguide systems.

Main Results:

  • In the strong-scattering regime, the off-resonant field approaches zero.
  • Over 90% coupling efficiency is achieved via Purcell-enhanced channeling.
  • CIORs differ significantly from those predicted by weak-scattering approximations.
  • Transmission spectra exhibit tunable bandstop or bandpass behavior based on input light polarization.

Conclusions:

  • CIORs are fundamentally different in the strong-scattering regime.
  • Scattering strength is a controllable parameter for tailoring CIORs.
  • Polarization-dependent transmission spectra confirm the tunability of optical coupling.