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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Higher-order optical resonance node detection of integrated disk microresonator.

M Ostrowski1, P Pignalosa, H Smith

  • 1New York University, New York City, New York 10012, USA.

Optics Letters
|August 18, 2011
PubMed
Summary

We demonstrated higher-order optical resonance detection using a disk microresonator. This technique precisely maps resonance modes for advanced optical sensing and self-referencing detection independent of temperature changes.

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Area of Science:

  • Photonics and optical engineering.
  • Integrated photonics.
  • Micro- and nanophotonics.

Background:

  • Disk microresonators support both fundamental and higher-order whispering gallery modes.
  • Optical resonance modes exhibit distinct electromagnetic field distributions.
  • Precise characterization of these modes is crucial for advanced optical applications.

Purpose of the Study:

  • To demonstrate higher-order optical resonance node detection using an integrated disk microresonator.
  • To investigate the spatial relationship between fundamental and higher-order modes.
  • To explore applications in high-resolution optical sensing and self-referencing detection.

Main Methods:

  • Utilized an integrated disk microresonator coupled to a bus waveguide.
  • Excited and analyzed the fundamental and second-order higher-order whispering gallery modes.
  • Measured the optical resonance mode profiles with high resolution.

Main Results:

  • Successfully detected higher-order optical resonance modes.
  • Observed a node in the second-order mode at a position of maximum energy for the fundamental mode.
  • Demonstrated high-resolution measurement of optical resonance mode profiles.

Conclusions:

  • The demonstrated technique enables precise detection of higher-order optical resonance modes.
  • The spatial characteristics of these modes offer potential for novel optical sensing and detection.
  • Self-referencing capabilities using coupled modes can lead to perturbation-independent optical detection.