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Double Resonance Techniques: Overview01:12

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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.
Spin decoupling is usually achieved by...
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Enhancement of Dissipative Sensing in a Microresonator Using Multimode Input.

Sreekul Raj Rajagopal1, A T Rosenberger1

  • 1Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA.

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|September 9, 2022
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Multimode input significantly enhances optical microresonator chemical sensing. This technique boosts dip-depth sensing sensitivity by over a thousand times compared to single-mode input, offering a more sensitive detection method.

Keywords:
dissipative sensingmicroresonatormultimode fiberwhispering-gallery modes

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Area of Science:

  • Photonics
  • Chemical Sensing
  • Optical Microresonators

Background:

  • Optical whispering-gallery microresonators are effective chemical sensors.
  • Current methods primarily use dispersive sensing, detecting frequency shifts.
  • Dissipative sensing, particularly through mode linewidth changes, offers higher sensitivity.

Purpose of the Study:

  • To investigate enhancing dip-depth dissipative sensing using multimode input.
  • To compare the sensitivity of multimode versus single-mode input for microresonator sensing.
  • To explore the potential of multimode input to improve sensing performance.

Main Methods:

  • Utilizing optical whispering-gallery microresonators with multimode fiber or waveguide input.
  • Measuring changes in the throughput dip depth of resonator modes.
  • Comparing dip-depth response with in-phase and out-of-phase input modes.

Main Results:

  • Multimode input enhances dip-depth sensing by over 1000 times compared to single-mode input.
  • Dip-depth sensing becomes nearly 100 times more sensitive than linewidth-change sensing with multimode input.
  • Enhancement factors are independent of the mode linewidth or quality factor (Q).

Conclusions:

  • Multimode input provides a significant enhancement for dip-depth dissipative sensing in optical microresonators.
  • This approach offers a substantial improvement in sensitivity over traditional dispersive and linewidth-based sensing methods.
  • The method relies on simple measurements of dip depth with controlled input mode phase relationships.