Ultrasmooth gold films via pulsed laser deposition

Doris K.T. Ng*, Bipin S. Bhola, Reuben M. Bakker, Seng Tiong Ho

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

A simple, one step technique for depositing ultrasmooth gold films using pulsed laser deposition is demonstrated by optimizing process parameters. The smoothest film having a root-mean-square roughness of 0.17 nm (including the substrate roughness of 0.11 nm) for a 35 nm thick film on a silicon substrate are obtained by introducing a nitrogen flow in the chamber during deposition. We postulate that the reduction in surface roughness caused by nitrogen gas pressure in the chamber is due to the force of the gas flow acting against the flow of the plasma plume containing Au atoms. The gas acts as a filter that reduces the kinetic energy of the gold adatoms. This is the best result reported so far for a single step deposition of gold. It is a step towards low-loss planar gold films for surface plasmon applications. A simple, one step technique for depositing ultrasmooth gold films using pulsed laser deposition is demonstrated. The smoothest films have a root-mean-square roughness of 0.17 nm (including the silicon substrate roughness of 0.11 nm). This is the best result reported so far for a single step deposition of gold and points towards low-loss gold films for surface plasmon applications.

Original languageEnglish (US)
Pages (from-to)2587-2592
Number of pages6
JournalAdvanced Functional Materials
Volume21
Issue number13
DOIs
StatePublished - Jul 8 2011

Keywords

  • Au
  • gold
  • pulsed laser deposition
  • surface plasmon resonance

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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