Gold dimer nanoantenna with slanted gap for tunable LSPR and improved SERS

Sameh Kessentini, Dominique Barchiesi, Cristiano D'Andrea, Andrea Toma, Nicolas Guillot, Enzo M. Di Fabrizio, Barbara Fazio, Onofrio M. Maragó, Pietro Giuseppe Gucciardi, Marc L. Lamy De La Chapelle

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

We focus on improving the surface-enhanced Raman scattering (SERS) of dimer nanoantenna by tailoring the shape of the coupled nanoantennas extremities from rounded to straight or slanted ones. A numerical model based on the discrete dipole approximation method-taking into account periodicity, adhesion layer, and roughness-is first validated by comparison with localized surface plasmon resonance (LSPR) and SERS experiments on round-edged dimer nanoantennas and then used to investigate the effect of the straight or slanted gap in the dimer antenna. Simulations show that both LSPR and SERS can be tuned by changing the gap slanting angle. The SERS enhancement factor can also be improved by 2 orders of magnitude compared to the one reached using a rounded gap. Therefore, the slanting angle can be used as a new control parameter in the design of SERS substrates to guarantee stronger field confinement and higher sensitivity, especially as its feasibility is demonstrated. © 2014 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)3209-3219
Number of pages11
JournalThe Journal of Physical Chemistry C
Volume118
Issue number6
DOIs
StatePublished - Feb 3 2014

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials

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