[15a-B410-1~12] 3.1 Basic optics and frontier of optics

[15a-B410-8] Laser trapping and necklace-like assembly formation of polystyrene microparticles
at solution surface

〇TETSUHIRO KUDO¹, Jia-Syun Lu¹, Hsuan-Yin Wang¹, Hiroshi Masuhara^1,2 (1.Natl. Chiao Tung Univ. Taiwan, 2.CEFMS, Natl. Chiao Tung Univ. Taiwan)

Keywords:laser trap, microparticles, solution surface

We here report that a large 150 μm-sized assembly of polystyrene microparticles with necklace-like patterns is prepared by light propagation through whispering gallery mode under the laser trapping of focal diameter about one micrometer. We performed the laser trapping of polystyrene microparticles at solution surface. The light propagation is directly confirmed by 1064 nm backscattering imaging, and finite difference time domain simulation well supports the idea that the optical potential is expanded outside the focal spot based on whispering gallery mode.