Trapping and monitoring of single nanoparticle using a metallic nanoantenna

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The hopping of a nanoparticle between two adjacent potential wells is a fundamental process in various physical, chemical, and biological phenomena. However, it is tricky to implement an experimental measure to study this process because handling a single nanoparticle is not a simple problem. We propose a 3D tapered metallic nanoantenna with a bow-tie-shaped hole illuminated by two lasers: a continuous-wave (CW) laser and a femtosecond laser. The CW laser produced a double-well potential inside the hole that trapped a single nanoparticle. The femtosecond laser generated a second harmonic signal by enhancing the nonlinear optical effect on the metal surface, which could be easily filtered and monitored. This two-laser platform provides the freedom to choose between the means for capturing a nanoparticle and the means for observing them. We controlled the landscape of the double-well potential by combining the gap size of a nanoantenna and optical pump power. The hopping of trapped nanoparticles over the central potential barrier was monitored and showed a maximum at the specific input laser power. This phenomenon agreed well with the theoretical prediction considering the thermal energy of a nanoparticle.

Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation XIX
EditorsKishan Dholakia, Gabriel C. Spalding
ISBN (Electronic)9781510653801
Publication statusPublished - 2022
EventOptical Trapping and Optical Micromanipulation XIX 2022 - San Diego, United States
Duration: 2022 Aug 212022 Aug 24

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOptical Trapping and Optical Micromanipulation XIX 2022
Country/TerritoryUnited States
CitySan Diego


  • double-well potential
  • Kramers hopping
  • nanoantenna
  • Nanoparticle
  • optical trapping
  • plasmonics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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