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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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Related Experiment Video

Updated: Jul 14, 2026

Fabrication and Testing of Microfluidic Optomechanical Oscillators
09:10

Fabrication and Testing of Microfluidic Optomechanical Oscillators

Published on: May 29, 2014

Tunable eletro-optical modulators based on a split-ring resonator.

R F Shiozaki1, E A L Henn, K M F Magalhães

  • 1Instituto de Física de São Carlos-USP, Caixa Postal 369, São Carlos, São Paulo 13560-970, Brazil.

The Review of Scientific Instruments
|May 17, 2007
PubMed
Summary

We developed a new electro-optical modulator with a tunable cavity, enabling broad frequency modulation. This widely tunable modulator overcomes previous bandwidth limitations and is suitable for atomic physics experiments.

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Area of Science:

  • Optics and Photonics
  • Atomic Physics

Background:

  • Split-ring resonators are commonly used for high-efficiency sideband generation in electro-optical modulators.
  • Conventional configurations are limited by narrow excitation bandwidths, typically around 20 MHz.

Purpose of the Study:

  • To present a novel electro-optical modulator design with a mechanically tunable cavity.
  • To achieve broad-range frequency tunability while maintaining high modulation efficiency.

Main Methods:

  • The design utilizes a split-ring resonator geometry.
  • A mechanically tunable cavity allows for adjustment of the modulation frequency.

Main Results:

  • The proposed setup achieves broad-range tunability over several hundred megahertz.
  • High modulation efficiency is maintained across the tunable frequency range.

Conclusions:

  • The novel design overcomes the narrow bandwidth limitation of traditional split-ring resonator modulators.
  • This widely tunable electro-optical modulator has potential applications in various atomic physics experiments.