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

doi:10.1117/12.2635852

3 October 2022 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

Proceedings Volume 12198, Optical Trapping and Optical Micromanipulation XIX; 121980B (2022) https://doi.org/10.1117/12.2635852
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

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.

Conference Presentation

Citation Download Citation

Seung Ju Yoon, Da In Song, Jungmin Lee, Myung-Ki Kim, Yong-Hee Lee, and Chang-Kyu Kim "Trapping and monitoring of single nanoparticle using a metallic nanoantenna", Proc. SPIE 12198, Optical Trapping and Optical Micromanipulation XIX, 121980B (3 October 2022); https://doi.org/10.1117/12.2635852

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