Effect of Intertip Coupling on the Plasmonic Behavior of Individual Multitipped Gold Nanoflower

Achyut Maity, Arpan Maiti, Pabitra Das, Dulal Senapati, Tapas Kumar Chini

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

We report here, the first experimental realization on the selective excitation of two closely lying tips from the same spherical core of a multitipped gold nanoparticle with flower-like morphology. This gives strong multipeaked resonance in the near-infrared region of the far-field emission spectra showing a clear signature of tip to tip coupling. The cathodoluminescence (CL) technique in a scanning electron microscope (SEM) combined with finite-difference time-domain (FDTD) simulation has helped us to identify the coupled plasmon modes to be originated from the interaction between two closely spaced tips with a narrow angular separation. Our analysis further estimates a range of angular separation between the tips that triggers the onset of the intertip coupling. (Graph Presented).

Original languageEnglish
Pages (from-to)1290-1297
Number of pages8
JournalACS Photonics
Volume1
Issue number12
DOIs
StatePublished - 17 Dec 2014
Externally publishedYes

Keywords

  • FDTD simulation
  • cathodoluminescence
  • electron beam spectroscopy
  • gold nanostar
  • localized surface plasmon resonance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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