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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Published on: July 21, 2018

Ultraconfined interlaced plasmons.

Tiago A Morgado1, João S Marcos, Mário G Silveirinha

  • 1Department of Electrical Engineering, Instituto de Telecomunicações, University of Coimbra, Portugal. tiago.morgado@co.it.pt

Physical Review Letters
|September 10, 2011
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new mesoscopic excitation in metallic nanorod grids. This phenomenon, arising from hybridized plasmons, is controlled by geometry and offers potential for nanoscale waveguiding applications.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Metamaterials

Background:

  • Metallic nanostructures support surface plasmon resonances.
  • Coupling between plasmons in nanorod arrays can lead to novel optical phenomena.

Purpose of the Study:

  • To describe a mesoscopic excitation in strongly coupled grids of metallic nanorods.
  • To investigate the factors determining the spatial scale of hybridized plasmons.
  • To explore potential applications of these plasmons in nanoscale waveguiding.

Main Methods:

  • Theoretical modeling of plasmon hybridization in nanorod grids.
  • Experimental fabrication and characterization of metallic nanorod arrays.
  • Analysis of the spatial scale of plasmonic excitations.

Main Results:

  • A mesoscopic excitation resulting from hybridized plasmons was observed.
  • The spatial scale of these interlaced plasmons is determined by geometrical features, not electrical length.
  • The plasmons exhibit wide band nature and weak sensitivity to metallic absorption.

Conclusions:

  • The described mesoscopic excitation is a robust phenomenon in coupled nanorod systems.
  • Geometrical control over plasmonic excitation scale is demonstrated.
  • These plasmons show promise for nanoscale waveguiding due to their unique properties.