聚焦表面波的光镊技术。
Optical Trapping with Focused Surface Waves.
作者信息
Xiang Yifeng, Tang Xi, Min Changjun, Rui Guanghao, Kuai Yan, Lu Fengya, Wang Pei, Ming Hai, Zhan Qiwen, Yuan Xiaocong, Lakowicz Joseph R, Zhang Douguo
机构信息
Department of Optics and Optical Engineering, Institute of Photonics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nano photonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen Guangdong 518060, China.
出版信息
Ann Phys. 2020 Apr;532(4). doi: 10.1002/andp.201900497. Epub 2020 Feb 24.
Near-field optical trapping can be realized with focused evanescent waves that are excited at the water-glass interface due to the total internal reflection, or with focused plasmonic waves excited on the water-gold interface. Herein, the performance of these two kinds of near-field optical trapping techniques is compared using the same optical microscope configuration. Experimental results show that only a single-micron polystyrene bead can be trapped by the focused evanescent waves, whereas many beads are simultaneously attracted to the center of the excited region by focused plasmonic waves. This difference in trapping behavior is analyzed from the electric field intensity distributions of these two kinds of focused surface waves and the difference in trapping behavior is attributed to photothermal effects due to the light absorption by the gold film.
近场光学捕获可以通过因全内反射在水-玻璃界面激发的聚焦倏逝波来实现，或者通过在水-金界面激发的聚焦等离子体波来实现。在此，使用相同的光学显微镜配置比较了这两种近场光学捕获技术的性能。实验结果表明，聚焦倏逝波只能捕获单个微米级聚苯乙烯珠，而聚焦等离子体波能同时将许多珠子吸引到激发区域的中心。从这两种聚焦表面波的电场强度分布分析了捕获行为的这种差异，并且将捕获行为的差异归因于金膜对光的吸收所导致的光热效应。
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