Juniper Michael P N, Besseling Rut, Aarts Dirk G A L, Dullens Roel P A
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK.
Opt Express. 2012 Dec 17;20(27):28707-16. doi: 10.1364/OE.20.028707.
Optical potential energy landscapes created using acousto-optical deflectors are characterized via solvent-driven colloidal particles. The full potential energy of both single optical traps and complex landscapes composed of multiple overlapping traps are determined using a simple force balance argument. The potential of a single trap is shown to be well described by a Gaussian trap with stiffness found to be consistent with those obtained by a thermal equilibrium method. We also obtain directly the depth of the well, which (as with stiffness) varies with laser power. Finally, various complex systems ranging from double-well potentials to random landscapes are generated from individually controlled optical traps. Predictions of these landscapes as a sum of single Gaussian wells are shown to be a good description of experimental results, offering the potential for fully controlled design of optical landscapes, constructed from single optical traps.
利用声光偏转器创建的光势能景观通过溶剂驱动的胶体粒子进行表征。使用简单的力平衡论证确定单个光阱以及由多个重叠阱组成的复杂景观的全势能。单个阱的势能被证明可以很好地用高斯阱来描述，其刚度与通过热平衡方法获得的刚度一致。我们还直接获得了阱的深度，该深度（与刚度一样）随激光功率而变化。最后，从单个可控光阱生成了从双阱势到随机景观的各种复杂系统。这些景观作为单个高斯阱之和的预测被证明是对实验结果的良好描述，为基于单个光阱构建的光景观的完全可控设计提供了潜力。
