Fabrication of self-organized precisely tunable plasmonic SERS substrates via glancing angle deposition

Ehsan Rezvani, Oral Ualibek, Brendan Bulfin, Gulnar Sugurbekova, Georg Stefan Duesberg, Igor Shvets

Research output: Contribution to journalArticle

Abstract

Plasmonic nanostructures offer great enhancement of the Raman signal due to the strong confinement of the electromagnetic field. Thus, they are considered as suitable candidates for surface enhanced Raman spectroscopy (SERS). In this work, we present an alternative fabrication route, called the glancing angle deposition (GLAD), for tunable fabrication of plasmonic self-organized Ag nanoparticle arrays aimed at SERS. Using the GLAD technique, the inter-particle distance within the arrays can be made as small as 1 nm. Moreover, the plasmonic resonance can be precisely tuned over the whole visible range. The GLAD method can be up-scaled; and when a transparent substrate is used, it enables various measurement geometries. The enhancement factor for the employed probe molecule in this study, rhodamine 6G, is estimated to be in the order of ∼108. It is noted that the nature of the GLAD-made substrates leads to the polarization dependence of the signal enhancement. The polarization studies show a stronger enhancement along the nanoparticles chain.

Original languageEnglish
Article number1700088
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume214
Issue number9
DOIs
Publication statusPublished - Sep 1 2017

Keywords

  • glancing angle deposition
  • hot spots
  • self-assembled nanoparticle arrays
  • SERS
  • tunable plasmonic nanostructures

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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