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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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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.
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

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Published on: July 21, 2018

Long-range surface plasmon polaritons propagating on a dielectric waveguide support.

W Mu1, J B Ketterson

  • 1Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA. w‑mu@northwestern.edu

Optics Letters
|December 6, 2011
PubMed
Summary

Researchers enhanced long-range surface plasmon polariton (LRSPP) properties by inserting a high-dielectric layer into metal films. This innovation reduces plasmonic losses, enabling thinner films for advanced sensor applications.

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Area of Science:

  • * Photonics and Plasmonics
  • * Materials Science and Engineering

Background:

  • * Traditional long-range surface plasmon polariton (LRSPP) structures utilize ultrathin metal films between dielectrics of identical constants.
  • * Existing LRSPP geometries face limitations in loss reduction and film thickness for practical device fabrication.

Purpose of the Study:

  • * To investigate a novel LRSPP structure incorporating a high-dielectric constant layer within the metal film sandwich.
  • * To determine the conditions for supporting LRSPP modes in this new configuration and analyze their properties.

Main Methods:

  • * Theoretical analysis of electromagnetic wave propagation in a multilayered structure.
  • * Derivation of the condition k(⊥)d=mπ for supporting LRSPP modes, where k(⊥) is the wavevector component and d is layer thickness.

Main Results:

  • * Demonstrated LRSPP modes in a structure with an inserted layer having a dielectric constant greater than its surroundings.
  • * Observed reduced propagation losses and comparable phase velocities compared to conventional LRSPP modes.
  • * Identified a specific thickness condition (k(⊥)d=mπ) for supporting these enhanced plasmon modes.

Conclusions:

  • * The proposed structure offers a viable strategy for supporting LRSPPs with significantly reduced losses.
  • * This approach enables the use of ultrathin silver films (tens of nanometers) for plasmonic device fabrication.
  • * The findings pave the way for developing highly sensitive plasmonic sensors for various applications.