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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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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Multimode Input Enhancement of Absorption Sensing of Methane in a Hollow Bottle Microresonator.

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Related Experiment Video

Updated: Jul 11, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Confirmation of Dissipative Sensing Enhancement in a Microresonator Using Multimode Input.

Sreekul Raj Rajagopal1, Limu Ke1, Karleyda Sandoval1

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

Sensors (Basel, Switzerland)
|November 14, 2023
PubMed
Summary
This summary is machine-generated.

Multimode input significantly enhances optical microresonator sensing sensitivity. This technique boosts dip-depth sensitivity by thousands of times, outperforming traditional methods for detecting analytes.

Keywords:
dissipative sensingmicroresonatormultimode fiberwhispering-gallery modes

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Area of Science:

  • Photonics
  • Optical Sensing
  • Microresonator Technology

Background:

  • Optical microresonators are valuable for sensing applications.
  • Sensing mechanisms include dispersive (resonance frequency shift) and dissipative (analyte absorption affecting mode linewidth and dip depth).
  • Achieving high dip-depth sensitivity often requires challenging overcoupling conditions.

Purpose of the Study:

  • To experimentally validate theoretical predictions of enhanced sensitivity using multimode input in optical microresonators.
  • To demonstrate a significant increase in dip-depth sensitivity compared to single-mode input and linewidth sensitivity.
  • To explore the practical application of multimode excitation for improved sensing.

Main Methods:

  • Theoretical modeling of multimode input effects on microresonator sensitivity.
  • Experimental setup utilizing a hollow bottle resonator with an absorbing dye in methanol.
  • Fabrication and characterization of an asymmetrically tapered fiber for generating multimode input.
  • Measurement and analysis of resonance shifts, linewidth changes, and dip depth variations.

Main Results:

  • Experimental confirmation of theoretically predicted sensitivity enhancements.
  • Achieved a sensitivity enhancement of several thousand times for dip depth with multimode input compared to single-mode input.
  • Observed a nearly 100-fold enhancement in dip-depth sensitivity over linewidth sensitivity.
  • Results align with theoretical predictions for multimode-enhanced dissipative sensing.

Conclusions:

  • Multimode input is a highly effective strategy for dramatically enhancing the sensitivity of optical microresonator-based sensors.
  • This approach offers a significant advantage over conventional single-mode excitation, particularly for dissipative sensing mechanisms.
  • The demonstrated technique provides a practical pathway to achieving ultra-sensitive optical detection.