Presentation Information
[10a-PA1-23]Remote optical trapping assembly of polystyrene particles in microchannels
〇(M2)Wen-Ting Chang1, Mu-En Li1, Xu Shi2, Yasutaka Matsuo2, Hiroshi Masuhara1 (1.National Yang Ming Chiao Tung Univ., Taiwan, 2.Hokkaido Univ., Japan)
Keywords:
Optical trapping,Polystyrene particles,Microchannels
Optical trapping is a highly effective technique that employs a tightly focused laser beam to capture and manipulate micro- and nanoparticles. In a previous study, our group reported the dynamic assembly of polystyrene (PS) particles by tightly focusing a linearly polarized laser at the glass/solution interface, where the outward propagation of the trapping laser expanded the assembly far beyond the directly irradiated area.1,2
In this work, we fabricated SU-8 microchannels on a glass substrate to investigate optical trapping. Using a 1064 nm laser to trap 1 μm PS particles, we observed that the particles were trapped not only within the primary focal spot but also in the adjacent left and right microchannels (Fig. 1a). This phenomenon demonstrates significant long-distance light propagation. Interestingly, while the PS assembly was unaffected by the laser linear polarization under conditions without microchannels, the particles in the neighboring channels exhibited a different alignment when the laser polarization was rotated by 90 degrees (Fig. 1b). To analyze this spatial alignment, we performed a power-dependence analysis. When changing the number of central trapped particles, we revealed that the assembly in the neighboring channels is caused by the scattering of the central particles. This study demonstrates the remote optical trapping assembly of polystyrene particles in microchannels.
In this work, we fabricated SU-8 microchannels on a glass substrate to investigate optical trapping. Using a 1064 nm laser to trap 1 μm PS particles, we observed that the particles were trapped not only within the primary focal spot but also in the adjacent left and right microchannels (Fig. 1a). This phenomenon demonstrates significant long-distance light propagation. Interestingly, while the PS assembly was unaffected by the laser linear polarization under conditions without microchannels, the particles in the neighboring channels exhibited a different alignment when the laser polarization was rotated by 90 degrees (Fig. 1b). To analyze this spatial alignment, we performed a power-dependence analysis. When changing the number of central trapped particles, we revealed that the assembly in the neighboring channels is caused by the scattering of the central particles. This study demonstrates the remote optical trapping assembly of polystyrene particles in microchannels.