Presentation Information
[17p-A32-9]Effects of Interactions Between Scattered Light from Two Co-Propagating Lasers on Optical Binding Forces Outside the Focal Spot
〇(M2)Xin-Xiu Wang1, Mu-En Li1, Chih-Hao Huang1, Boris Louis2, Roger Bresoli-Obach3, Johan Hofkens2, Hiroshi Masuhara1, Yung-Fu Chen1 (1.Nat'l Yang Ming Chiao Tung Univ., Taiwan, 2.Ktholieke Univ. Leuven, Belgium, 3.Univ. Ramon Llull, Spain)
Keywords:
dual beam optical trapping,optical binding
Optical binding enables the light-induced assembly of complex multi-particle structures. We have demonstrated that the trapping of gold (Au) nanoparticles (NPs) at the focal point results in the scattered light forming multiple arc-shaped potential wells (Fig. 1c). These wells are observed at half-wavelength intervals of the trapping laser, extending beyond the focal spot. The external NP inside the arcs show a correlated motion with the linear aligned particles in the irradiation area1,2. Then, we introduced two co-propagating laser beams at distinct positions to investigate the binding dynamics outside the focal spot.3 Here the dynamics is analyzed more quantitatively and considered deeply.
The Au NPs can be trapped between and outside the focal points of two lasers, forming two optical binding systems (Fig. 1a). Initially, a single Au NP is localized between two pairs of three optically bound NPs inside the respective focal points, creating a distribution of three potential wells. It is calculated that the highest stiffness is obtained for the middle potential well (Fig. 1b). The Au NPs in the left or right potential well shows a high correlation with the corresponding optical binding system. This indicates that the particle in the middle well binds with both systems simultaneously, enhancing the binding force compared to a single beam trapping system.
The Au NPs can be trapped between and outside the focal points of two lasers, forming two optical binding systems (Fig. 1a). Initially, a single Au NP is localized between two pairs of three optically bound NPs inside the respective focal points, creating a distribution of three potential wells. It is calculated that the highest stiffness is obtained for the middle potential well (Fig. 1b). The Au NPs in the left or right potential well shows a high correlation with the corresponding optical binding system. This indicates that the particle in the middle well binds with both systems simultaneously, enhancing the binding force compared to a single beam trapping system.
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