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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.

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Related Experiment Video

Updated: May 25, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Giant coupling effect between metal nanoparticle chain and optical waveguide.

Mickaël Février1, Philippe Gogol, Abdelhanin Aassime

  • 1Univ Paris-Sud, Institut d'Electronique Fondamentale, UMR 8622, 91405 Orsay cedex, France.

Nano Letters
|January 19, 2012
PubMed
Summary
This summary is machine-generated.

We show that optical energy from a dielectric waveguide can be fully transferred to a metal nanoparticle chain

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Last Updated: May 25, 2026

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Area of Science:

  • Photonics
  • Plasmonics
  • Nanotechnology

Background:

  • Dielectric waveguides are crucial for optical signal transmission.
  • Plasmonics offers unique light-matter interactions at the nanoscale.

Purpose of the Study:

  • To demonstrate total energy transfer from a dielectric waveguide mode to a plasmon mode.
  • To investigate mode coupling mechanisms and efficiency.

Main Methods:

  • Utilizing evanescent field coupling between a dielectric waveguide and a metal nanoparticle chain.
  • Performing experiments at a wavelength of 1.5 μm.

Main Results:

  • Achieved total optical energy transfer into a transverse plasmon mode.
  • Observed giant coupling effects with record short coupling lengths (~560 nm).

Conclusions:

  • This energy transfer mechanism is efficient and scalable.
  • Enables the development of nanometer-scale devices for photonic integrated circuits.