Dynamic Evolution of Metallic Nanoparticle Assembly Under Optical Trapping at Interface
Tetsuhiro Kudo1*, Shang-Jan Yang1, Hiroshi Masuhara1
1Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
* Presenter:Tetsuhiro Kudo, email:kudo@nctu.edu.tw
We demonstrate the optical trapping and assembling of gold nanoparticles at glass/solution interface with a tightly focused laser beam. A single assembly consisting of many gold nanoparticles is formed at the interface, and the assembly is directionally extended outside the focus perpendicular to the linear polarization like a radiation pattern of dipole scattering, while the assembly shows the circular shape extending outside the focus with circularly polarized light. The gold nanoparticle assembly and the light field of trapping laser are together evolved outside the focus by optical trapping, light scattering and its interference. We believe that the present finding provides a novel aspect for the studies of multibody system whose elements are interacted and bound with each other by light scattering under optical trapping.

Keywords: optical trapping, light scattering, gold nanoparticles, nonlinear dynamics, optical binding