ITO/Au/ITO sandwich structure for near-infrared plasmonics

Xu Fang, Chee Leung Mak, Jiyan Dai, Kan Li, Hui Ye, Chi Wah Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)

Abstract

ITO/Au/ITO trilayers with varying gold spacer layer thicknesses were deposited on glass substrates by pulsed laser deposition. Transmission electron microscopy measurements demonstrated the continuous nature of the Au layer down to 2.4 nm. XRD patterns clearly showed an enhanced crystallinity of the ITO films promoted by the insertion of the gold layer. Compared with a single layer of ITO with a carrier concentration of 7.12 × 1020cm-3, the ITO/Au/ITO structure achieved an effective carrier concentration as high as 3.26 × 1022cm-3. Transmittance and ellipsometry measurements showed that the optical properties of ITO/Au/ITO films were greatly influenced by the thickness of the inserted gold layer. The cross-point wavelength of the trilayer samples was reduced with increasing gold layer thickness. Importantly, the trilayer structure exhibited a reduced loss (compared with plain Au) in the near-infrared region, suggesting its potential for plasmonic applications in the near-infrared range.
Original languageEnglish
Pages (from-to)15743-15752
Number of pages10
JournalACS Applied Materials and Interfaces
Volume6
Issue number18
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Electrical and optical properties
  • ITO/Au/ITO
  • Plasma frequency
  • Pulsed laser deposition
  • Transparent conductive oxide

ASJC Scopus subject areas

  • Materials Science(all)

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