[14a-PB1-1~12] 3.1 Basic optics and frontier of optics

▲ [14a-PB1-1] Association/Dissociation Dynamics and Rotational Motion of Gold Nanoparticles Optically Trapped at Glass/Solution Interface

〇(D)Chih-Hao Huang¹, Tetsuhiro Kudo¹, Teruki Sugiyama^1,2,3, Hiroshi Masuhara^1,2 (1.Department of Applied Chemistry, College of Science, National Chiao Tung Univ. Taiwan, 2.Center for Emergent Functional Matter Science, National Chiao Tung Univ. Taiwan, 3.Division of Materials Science, NAIST, Japan)

Keywords:laser trapping, gold nanoparticles, circular polarization

Laser trapping is a technique which utilizes a tightly focused laser beam to manipulate small objects such as living cells or micro/nanoparticles. Our group is exploring assembling dynamics of nanoparticles through applying laser trapping at the interface where the particle assembly can dynamically evolve to the outside of the irradiated area. Previously, we reported that gold nanoparticles (Au NPs) formed a dumbbell-shaped swarming by a linearly polarized laser while a spherical swarming is formed by circularly polarized (CP) laser. Recent experimental results suggest that the self-aligned structure of Au NPs inside the focus affects the swarming drastically. Thus, the dynamics of laser trapping of Au NPs in the initial stage is studied through single particle level trapping experiments.