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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Reflection of cylindrical surface waves.

Reuven Gordon1

  • 1Department of Electrical and Computer Engineering, University of Victoria, Victoria, BC, Canada. rgordon@uvic.ca

Optics Express
|April 8, 2010
PubMed
Summary
This summary is machine-generated.

A new theory accurately predicts surface wave reflection on metal wires, aiding nanoplasmonics and terahertz spectroscopy applications. This model validates experimental findings for nanorods and optical antennas.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Surface waves on metal wires are crucial in nanoplasmonics and terahertz spectroscopy.
  • Understanding wave reflection at abrupt terminations is essential for device design.

Purpose of the Study:

  • To derive a theory for the reflection of radially polarized surface waves on metal wires at an abrupt end.
  • To enable straightforward calculation of the reflection coefficient (amplitude and phase).

Main Methods:

  • Theoretical derivation of surface wave reflection.
  • Quantitative comparison with numerical simulations for various wire sizes.
  • Calculation of wavelength-dependent reflection for gold nanorods.

Main Results:

  • The theory accurately predicts reflection coefficients, agreeing with simulations for small wires.
  • The model successfully predicts reflection minima for larger wires.
  • Calculated Fabry-Perot resonance wavelengths for gold nanorods show good agreement with experimental surface plasmon resonances.

Conclusions:

  • The developed theory provides a valuable tool for calculating surface wave reflection.
  • The theory demonstrates predictive capability for nanorods, optical antennas, and plasmonic resonators.
  • This work facilitates advancements in nanoplasmonics and terahertz spectroscopy.