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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

869
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...
869
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

991
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
991

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Related Experiment Video

Updated: Apr 27, 2026

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Published on: January 3, 2016

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Field enhancement and resonance phenomena in complex three-dimensional nanoparticles: efficient computation using the

Yakir Ishay, Yehuda Leviatan, Guy Bartal

    Optics Letters
    |July 1, 2014
    PubMed
    Summary
    This summary is machine-generated.

    A new semi-analytical method accurately computes electromagnetic fields for complex 3D nanoparticles (NPs). This efficient technique surpasses existing software for analyzing plasmonic NP behavior, especially those with intricate shapes.

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    Area of Science:

    • * Computational electromagnetics
    • * Nanophotonics and plasmonics

    Background:

    • * Accurate simulation of electromagnetic fields around complex 3D nanoparticles is crucial for understanding plasmonic behavior.
    • * Existing numerical methods like finite-difference time domain (FDTD) and finite-element methods (FEM) can be computationally expensive and less accurate for intricate geometries.

    Purpose of the Study:

    • * To introduce a novel semi-analytical method for calculating electromagnetic fields in and around complex 3D nanoparticles.
    • * To demonstrate the method's capability in analyzing plasmonic nanoparticles with nonsymmetrical shapes and small radii of curvature.

    Main Methods:

    • * The method utilizes the source-model technique.
    • * A new algorithm for intricate source distribution, based on surface curvature, is employed.
    • * Semi-analytical approach for enhanced computational efficiency and accuracy.

    Main Results:

    • * Successfully computed electromagnetic fields for complex 3D plasmonic nanoparticles.
    • * Demonstrated the method's ability to resolve three axial resonances in a 3D cashew-nut shaped nanoparticle.
    • * Showcased the broadband response analysis for peanut-shell nanoparticles.

    Conclusions:

    • * The presented semi-analytical method offers a powerful and efficient alternative for simulating electromagnetic fields in complex 3D nanostructures.
    • * The technique provides superior efficiency and accuracy compared to FDTD and FEM software.
    • * Enables detailed analysis of plasmonic phenomena in arbitrarily shaped nanoparticles.