Ultrahigh Field Enhancement Optimization Versus Rabi Splitting Investigated Using Au Nano-Bipyramids on Metal Films

Mohammad Abutoama, Sivan Isaacs, Michael Ney, Liubiao Zhong, Dong Li, Lin Jiang, Ibrahim Abdulhalim

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

When localized surface plasmons (LSPs) are coupled to extended surface plasmons (ESPs), higher density of particles causes stronger interaction, larger Rabi splitting (RS), and plasmonic energy band gap. Optimization of the field enhancement (FE) is addressed theoretically and experimentally particularly because the ultrahigh FE was found recently to exist when LSPs are excited via ESPs under the prism and grating coupling. The larger the RS, the weaker the FE, and at optimum density, RS almost vanishes. Under free-space excitation, for some periodicities of nano-bipyramids, ESPs-LSPs coupling occurs, causing RS and therefore two new hybrid modes, thus decreasing the field intensity by factor ∼×1.7; wherein under prism excitation, it drastically decreases by ∼×100. An additional effect is observed for free-space excitation far from the ESP-LSP coupling condition and that is the occurrence of a blueshift in the LSP wavelengths as the periodicity decreases, causing a decrease of FE by nearly an order of magnitude.

Original languageEnglish
Pages (from-to)12984-12996
Number of pages13
JournalJournal of Physical Chemistry C
Volume123
Issue number20
DOIs
StatePublished - 23 May 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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