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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Area of Science:

  • Photonics
  • Plasmonics
  • Microcavity devices

Background:

  • Hybrid microresonators are key platforms for fundamental research and applied photonics.
  • Whispering gallery modes (WGMs) in microresonators enable various photonic applications.
  • Tuning the coupling between optical modes is crucial for microcavity device performance.

Purpose of the Study:

  • To investigate plasmonics-engineered coupling between degenerate optical whispering gallery modes.
  • To explore tuning these modes across dissipative strong, dispersive strong, and weak coupling regimes.
  • To provide fundamental guidance for practical microcavity devices.

Main Methods:

  • Experimentally coupling a plasmonic resonance to a cavity mode family in a waveguide-integrated high-Q microdisk.
  • Extracting complex coupling coefficients from experimental data.
  • Measuring far fields of hybridized cavity modes to analyze radiative interference.

Main Results:

  • Achieved coupling strength over 10 GHz for both dissipative and dispersive interactions.
  • Demonstrated remarkable enhancement in coupling strength compared to dielectric scatterers.
  • Observed coherent interference between radiative channels in hybridized cavity modes.

Conclusions:

  • Plasmonics-engineered coupling offers a powerful method for tuning whispering gallery modes.
  • The study provides a pathway for enhanced control over microcavity modes.
  • Results offer fundamental insights for designing next-generation microcavity photonic devices.