Spatial evolution of the near-field distribution on planar gold nanoparticles with the excitation wavelength across dipole and quadrupole modes

Jinghuan Yang, Quan Sun, Yu Han, Kosei Ueno, Hiroaki Misawa, Qihuang Gong

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13 Scopus citations

Abstract

We investigate the superposition properties of the dipole and quadrupole plasmon modes in the near field both experimentally, by using photoemission electron microscopy (PEEM), and theoretically. In particular, the asymmetric near-field distributions on gold (Au) nanodisks and nanoblocks under oblique incidence with different polarizations are investigated in detail. The results of PEEM measurements show that the evolutions of the asymmetric near-field distributions are different between the excitation with s-polarized and p-polarized light. The experimental results can be reproduced very well by numerical simulations and interpreted as the superposition of the dipole and quadrupole modes with the help of analytic calculations. Moreover, we hypothesize that the electrons collected by PEEM are mainly from the plasmonic hot spots located at the plane in the interface between the Au particles and the substrate in the PEEM experiments. (C) 2017 Chinese Laser Press
Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalPhotonics Research
Volume5
Issue number3
DOIs
StatePublished - 1 Jun 2017

Keywords

  • SURFACE-PLASMON RESONANCE; PHOTOEMISSION ELECTRON-MICROSCOPY; INDUCED CHARGE SEPARATION; ENERGY-LOSS SPECTROSCOPY; VISIBLE-LIGHT; METAL NANOPARTICLES; DARK MODES; CONVERSION; WATER; ABSORPTION

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