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 language | English |
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Pages (from-to) | 1290-1297 |
Number of pages | 8 |
Journal | ACS Photonics |
Volume | 1 |
Issue number | 12 |
DOIs | |
State | Published - 17 Dec 2014 |
Externally published | Yes |
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