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Double Resonance Techniques: Overview

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.
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Related Experiment Video

Updated: Jan 9, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Super-resolving binary-source hypothesis testing with a double-clad fiber coupler.

John S Wallis, David R Gozzard, Alex M Frost

|December 1, 2025

Summary

This summary is machine-generated.

This study introduces a novel optical technique using a double-clad fiber coupler to distinguish between one or two point sources. The method successfully identifies closely spaced sources, even below the Rayleigh limit, for improved astronomical imaging.

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Last Updated: Jan 9, 2026

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Area of Science:

Optics and Photonics
Astronomical Instrumentation

Background:

Distinguishing between single and multiple point sources is crucial in various scientific fields, including astronomy.
Traditional methods often face limitations due to the Rayleigh criterion, which defines the resolution limit for optical instruments.

Purpose of the Study:

To develop and demonstrate a new technique for binary spatial mode demultiplexing.
To utilize this technique for hypothesis testing of one or two point sources in an optical field.
To assess the technique's capability in resolving sources below the classical diffraction limit.

Main Methods:

Employing a double-clad fiber coupler as an optical mode sorter.
Demultiplexing an incident optical field into fundamental and higher-order modes.
Analyzing the ratio of multi-mode to single-mode power for source classification.

Main Results:

Successfully demonstrated the capability to accurately identify two point sources separated below the Rayleigh limit.
Achieved correct identification of two optical sources with relative brightness differences down to -20 dB.
Showcased accurate detection of sources with separations 50x smaller than the Rayleigh limit for sources with <5 dB relative power difference.

Conclusions:

The presented technique offers a simple and effective method for super-resolving classification of point emitters.
This approach holds significant potential for applications in astronomical imaging, particularly for resolving binary systems.
The technique provides a powerful tool for enhancing resolution beyond conventional limits.