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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

Experimental study of the interaction between localized and propagating surface plasmons.

Yizhuo Chu1, Kenneth B Crozier

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

Optics Letters
|February 3, 2009
PubMed
Summary

We observed strong coupling between localized and propagating surface plasmons in a gold nanoparticle array. This interaction, tunable by nanoparticle size and array period, is key for plasmonic device development.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Materials Science and Engineering

Background:

  • Surface plasmons, collective oscillations of electrons at metal-dielectric interfaces, are crucial for light manipulation.
  • Localized surface plasmons (LSPs) in nanoparticles and propagating surface plasmon polaritons (SPPs) on thin films exhibit distinct optical properties.
  • Understanding the interaction between LSPs and SPPs is vital for designing advanced plasmonic devices.

Purpose of the Study:

  • To investigate the strong coupling regime between localized surface plasmons (LSPs) and propagating surface plasmon polaritons (SPPs).
  • To explore the tunability of LSP-SPP interactions by controlling structural parameters.
  • To demonstrate a platform for engineering coupled plasmonic resonances.

Main Methods:

  • Fabrication of a hybrid plasmonic structure comprising a 2D periodic gold nanoparticle array on an SiO2 spacer atop a continuous gold film.
  • Optical characterization using reflection spectroscopy to analyze resonance wavelengths.
  • Systematic variation of gold nanoparticle size and array period to tune plasmonic resonances.

Main Results:

  • Observation of distinct resonance wavelengths for both localized surface plasmons and propagating surface plasmons.
  • Demonstration of tunable resonance positions by altering nanoparticle dimensions and array periodicity.
  • Experimental evidence of strong coupling, indicated by an anticrossing behavior in the reflection spectra.

Conclusions:

  • Strong coupling between localized and propagating surface plasmons is achieved in the designed nanostructure.
  • The interaction can be effectively tuned by modifying the geometric parameters of the gold nanoparticle array.
  • This work provides a foundation for developing novel plasmonic devices with tailored optical responses.