Wilson Benjamin K, Mentele Tim, Bachar Stephanie, Knouf Emily, Bendoraite Ausra, Tewari Muneesh, Pun Suzie H, Lin Lih Y
Department of Electrical Engineering, University of Washington, Seattle, WA 98195, USA.
Opt Express. 2010 Jul 19;18(15):16005-13. doi: 10.1364/OE.18.016005.
We propose and demonstrate a purely optical approach to trap and align particles using the interaction of polarized light with periodic nanostructures to generate enhanced trapping force. With a weakly focused laser beam, we observed efficient trapping and transportation of polystyrene beads with sizes ranging from 10 mum down to 190 nm as well as cancer cell nuclei. In addition, alignment of non-spherical dielectric particles to a 1-D periodic nanostructure was achieved with low laser intensity without attachment to birefringent crystals. Bacterial cells were trapped and aligned with incident optical intensity as low as 17 microW/microm(2).
我们提出并展示了一种纯光学方法，利用偏振光与周期性纳米结构的相互作用来捕获和排列粒子，以产生增强的捕获力。使用弱聚焦激光束，我们观察到尺寸范围从10微米到190纳米的聚苯乙烯微珠以及癌细胞核的高效捕获和运输。此外，在低激光强度下实现了非球形介电粒子与一维周期性纳米结构的排列，且无需附着双折射晶体。细菌细胞在低至17微瓦/微米²的入射光强度下被捕获并排列。
