Presentation Information
[11p-C310-2]Optical trapping and binding dynamics of gold nanoparticles on nanodisk array by tuning laser wavelength
〇(M2)Tien Hsi Tsai1, Mu-En Li1, Xu Shi2, Kosei Ueno2, Boris Louis3, Roger Bresoli-Obach4, Hiroaki Misawa1,2,5, Johan Hofkens3, Hiroshi Masuhara1 (1.National Yang Ming Chiao Tung Univ., Taiwan, 2.Hokkaido Univ., Japan, 3.KU Leuven, Belgium, 4.Universitat Ramon Llull, Spain, 5.Okayama Univ., Japan)
Keywords:
optical trapping,gold nanoparticles,gold nanodisk
Our group demonstrated for the first time optical trapping of 200 nm gold nanoparticles (Au NPs) at the glass/solution interface using a 1064 nm laser wavelength, resulting in a dumbbell-shaped assembly which is called swarming.1 The trapped Au NPs scatter the light, thereby constructing optical binding interactions within and outside the focus. This laser-induced binding encourages Au NPs fluctuating outside the focus, leading to an arc-like distribution.2 Consequently, optical binding serves as a fundamental mechanism governing swarming assembly. First, we confirmed that varying the laser wavelength alters the swarming size without significantly reforming its morphology. Then, to actively modulate and control the swarming morphology through laser wavelength tuning, we introduce lithographically fabricated linear nanodisk (ND) array for dynamic morphological control.3
In this study, we demonstrate how the trapping of 300 nm Au NPs at the edge of a 5 ND linear array is modulated by laser wavelength, altering the optical binding network and generating distinct arc-shaped distributions. Figure 1 illustrates how the arc distribution varies with the laser wavelength. By changing the laser wavelength from 932 nm (Figure 1a) to 742 nm (Figure 1b), the arc-shaped distribution becomes less clear. Also, depending on the wavelength, the number and the width of the arcs differ. These results will be detailed and discussed in this presentation.
In this study, we demonstrate how the trapping of 300 nm Au NPs at the edge of a 5 ND linear array is modulated by laser wavelength, altering the optical binding network and generating distinct arc-shaped distributions. Figure 1 illustrates how the arc distribution varies with the laser wavelength. By changing the laser wavelength from 932 nm (Figure 1a) to 742 nm (Figure 1b), the arc-shaped distribution becomes less clear. Also, depending on the wavelength, the number and the width of the arcs differ. These results will be detailed and discussed in this presentation.