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Surface plasmon polariton waveguiding in random surface nanostructures.

S I Bozhevolnyi1, V S Volkov, K Leosson

  • 1Institute of Physics, Aalborg University, Pontoppidanstraede 103, DK-9220 Aalborg Øst, Denmark. sergey@physics.auc.dk

Journal of Microscopy
|March 19, 2003
PubMed
Summary

Surface plasmon polaritons can be guided along channels in random structures on gold films. This study demonstrates controlled propagation and low-loss bending of these polaritons, even with surface scatterers.

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Area of Science:

  • Nanophotonics
  • Plasmonics
  • Surface Science

Background:

  • Surface plasmon polaritons (SPPs) are electromagnetic waves propagating at the interface between a metal and a dielectric.
  • Controlling SPP propagation in the presence of surface imperfections is crucial for nanophotonic device development.

Purpose of the Study:

  • To investigate the guiding of SPPs along corrugation-free channels on a gold film with randomly distributed surface scatterers.
  • To demonstrate controlled SPP propagation and low-loss bending in such complex nanostructures.

Main Methods:

  • Excitation of SPPs on a gold film surface.
  • Imaging of SPP intensity distributions using near-field microscopy.
  • Fabrication of gold films with randomly located gold bumps as scatterers and defined channels.

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Main Results:

  • Complete inhibition of SPP propagation within random gold bump structures (70 nm high, 75 µm⁻² density) on a 55 nm gold film in the 713-815 nm wavelength range.
  • Well-defined SPP guiding along 2 µm wide corrugation-free channels within the random structures.
  • Low-loss SPP guiding around 20-degree bends (approx. 15 µm bend radius) in the 738-774 nm wavelength range.

Conclusions:

  • Corrugation-free channels enable effective guiding of SPPs amidst random surface scatterers.
  • The demonstrated guiding and low-loss bending capabilities are promising for integrated plasmonic circuits.