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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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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Size-dependent coupling between localized surface plasmons and excitons in silicon nitride matrix.

Feng Wang1, Dongsheng Li, Lu Jin

  • 1State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China.

Optics Letters
|August 2, 2013
PubMed
Summary

Localized surface plasmons (LSPs) in silver nanostructures enhance silicon nitride (SiN(x)) photoluminescence (PL). This study demonstrates that the size-dependent coupling between LSPs and excitons is key to the observed PL enhancement.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Silicon nitride (SiN(x)) is a material with potential optoelectronic applications.
  • Photoluminescence (PL) is a crucial property for light-emitting devices.
  • Localized surface plasmons (LSPs) are known to interact with light and matter.

Purpose of the Study:

  • To investigate the size-dependent coupling between localized surface plasmons (LSPs) and excitons in a SiN(x) matrix.
  • To understand the mechanism behind photoluminescence enhancement in SiN(x) with silver nanostructures.

Main Methods:

  • Fabrication of silver (Ag) nanostructures of various sizes.
  • Integration of Ag nanostructures into a SiN(x) matrix.
  • Photoluminescence (PL) spectroscopy to measure light emission.
  • Analysis of the correlation between LSP resonance and PL enhancement.

Main Results:

  • A strong correlation was observed between photoluminescence enhancement and LSP-exciton resonance coupling.
  • The size of Ag nanostructures significantly influences the LSP resonance peaks.
  • PL enhancement in SiN(x) is primarily attributed to LSP resonance coupling.

Conclusions:

  • The study confirms that size-dependent LSP-exciton coupling is responsible for enhanced PL in SiN(x).
  • Silver nanostructures can be used to tune and improve the photoluminescent properties of silicon nitride.