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Related Concept Videos

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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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Related Experiment Video

Updated: Sep 10, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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On-Chip Multimode WGM Microresonator with Cross-Correlation Algorithm for Enhanced Sensing.

Wenbo Mao1, Fu Li1, Di Jia1,2

  • 1Department of Electrical and Systems Engineering, Washington University, St Louis, MO, 63130, USA.

Laser & Photonics Reviews
|August 21, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a multimode algorithm for optical whispering-gallery-mode (WGM) microresonators, enhancing precision measurements. The new method accurately detects nanoparticles even amidst environmental temperature changes.

Keywords:
correlation algorithmmultimodeoptical sensingsilicon photonics

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Area of Science:

  • Photonics and Optical Sensing
  • Integrated Photonics
  • Nanoscale Metrology

Background:

  • Optical whispering-gallery-mode (WGM) microresonators offer high sensitivity for precision measurements.
  • Current methods analyzing single WGM resonances struggle with multiple targets or environmental fluctuations.
  • Distinguishing local perturbations from global changes is crucial for accurate sensing.

Purpose of the Study:

  • To develop a novel sensing algorithm for WGM microresonators.
  • To overcome limitations of single-mode analysis in complex environments.
  • To enable accurate detection of local perturbations amidst environmental variations.

Main Methods:

  • Proposed a multimode-based cross-correlation algorithm.
  • Integrated on-chip silicon microresonators and pulley bus waveguides for multimode excitation.
  • Validated the method through a proof-of-concept experiment detecting nanoparticles.

Main Results:

  • The multimode algorithm effectively distinguishes local perturbations from global environmental fluctuations.
  • Demonstrated successful nanoparticle detection in a temperature-varying environment.
  • Validated the robustness and accuracy of the proposed sensing approach.

Conclusions:

  • The multimode-based cross-correlation algorithm enhances WGM microresonator sensing capabilities.
  • This approach offers a versatile solution for complex sensing scenarios, including molecule detection.
  • Paves the way for high-sensitivity sensing using scalable integrated photonic platforms.