Opt Express. 2023 Jan 16;31(2):2621-2627. doi: 10.1364/OE.480802.
We demonstrate reflection geometry optical trapping using double nanoholes in a metal film. Symmetry breaking of the double nanohole allows for selecting the scattered trapping laser light of orthogonal polarization to the incident beam. This orthogonal polarization light shows a few percent increase when the nanoparticle (e.g., a 20 nm polystyrene particle, or protein bovine serum albumin) is trapped. The reflection geometry simplifies the optical setup and frees up one side of the trap, which has great potential for adding microfluidics to the other side or working with opaque or highly scattering samples.
我们展示了使用金属膜中的双纳米孔实现反射几何光学捕获。双纳米孔的对称破缺允许选择与入射光束正交偏振的散射捕获激光光。当纳米粒子（例如，20nm 的聚苯乙烯粒子或牛血清白蛋白蛋白）被捕获时，这种正交偏振光会增加几个百分点。反射几何形状简化了光学设置，并释放了捕获器的一侧，这为在另一侧添加微流控或与不透明或高度散射的样品一起工作提供了很大的潜力。
