Hopping of single nanoparticles trapped in a plasmonic double-well potential

Seung Ju Yoon, Da In Song, Jungmin Lee, Myung Ki Kim, Yong Hee Lee, Chang Kyu Kim

Research output: Contribution to journalReview articlepeer-review

2 Citations (Scopus)

Abstract

Thermally induced particle hopping in the nanoscale double-well potential is fundamental in material design and device operation. After the proposal of the basic hopping theory, several experimental studies, including some using the optical trapping method, have validated the theoretical approach over various friction ranges of the surrounding medium. However, only external parameters, such as viscosity, temperature, and pressures, have been varied in practical circumstances, and other tools capable of adjusting the potential profile itself to modulate the hopping rate are needed. By using metallic nanoantenna with various gap sizes and different optical pump power, we engineered a double-well potential landscape and directly observed the hopping of a single nanoparticle with a diameter of 4 nm. The distance between the two potential wells was 0.6-5 nm, and the maximum well depth and maximum height of the central potential barrier were approximately 69 and 4 k B T, respectively. The hopping rate was governed by the Arrhenius law and showed a vertex when the barrier height was approximately 2 k B T, which was in good agreement with the computational expectations.

Original languageEnglish
Pages (from-to)4729-4735
Number of pages7
JournalNanophotonics
Volume9
Issue number16
DOIs
Publication statusPublished - 2020 Nov 1

Keywords

  • Arrhenius factor
  • Kramers hopping
  • double-well potential
  • nanoantenna
  • plasmonics

ASJC Scopus subject areas

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

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