Bimetallic structure fabricated by laser interference lithography for tuning surface plasmon resonance

Opt Express. 2008 Jul 7;16(14):10701-9. doi: 10.1364/oe.16.010701.

Abstract

Tuning of surface plasmon resonance by gold and silver bimetallic thin film and bimetallic dot array is investigated. Laser interference lithography is applied to fabricate the nanostructures. A bimetallic dot structure is obtained by a lift-off procedure after gold and silver thin film deposition by an electron beam evaporator. Surface plasmon behaviors of these films and nanostructures are studied using UV-Vis spectroscopy. It is observed that for gold thin film on quartz substrate, the optical spectral peak is blue shifted when a silver thin film is coated over it. Compared to the plasmon band in single metal gold dot array, the bimetallic nanodot array shows a similar blue shift in its spectral peak. These shifts are both attributed to the interaction between gold and silver atoms. Electromagnetic interaction between gold and silver nanostructures is discussed using a simplified spring model.

MeSH terms

  • Electromagnetic Fields
  • Equipment Design
  • Gold / chemistry
  • Lasers*
  • Metal Nanoparticles / chemistry
  • Metals / chemistry
  • Nanostructures / chemistry
  • Optics and Photonics*
  • Silver / chemistry
  • Spectrophotometry / methods
  • Spectrophotometry, Ultraviolet / methods
  • Surface Plasmon Resonance / instrumentation*
  • Surface Plasmon Resonance / methods*
  • Ultraviolet Rays

Substances

  • Metals
  • Silver
  • Gold