Wills Jon B, Butler Jason R, Palmer John, Reid Jonathan P
School of Chemistry, University of Bristol, Bristol, UK BS8 1TS.
Phys Chem Chem Phys. 2009 Sep 28;11(36):8015-20. doi: 10.1039/b908270k. Epub 2009 Jul 7.
We demonstrate the ability to direct the flow of aerosol droplets through a trapping cell using a tailored optical landscape generated by spatial light modulation. Using an optical barrier, droplets held in an optical trap can be effectively isolated from other droplets within the aerosol. To illustrate the effective isolation we compare the influence of different optical landscapes on the flow of free aerosol around a trapped droplet. We also present spectroscopic evidence of the optical barrier effect and apply the technique to permit controlled loading of different aerosol particles into neighbouring optical traps. This method will enable comparative measurements of aerosol properties to be made and facilitate the study of aerosol chemistry in sub-picolitre droplets. It also facilitates the use of an isolated droplet of known composition as a sensitive probe of the gas phase conditions in an aerosol ensemble.
我们展示了利用空间光调制产生的定制光学景观来引导气溶胶液滴流通过捕获池的能力。使用光学屏障，被光阱捕获的液滴可以有效地与气溶胶中的其他液滴隔离开来。为了说明这种有效隔离，我们比较了不同光学景观对捕获液滴周围自由气溶胶流动的影响。我们还给出了光学屏障效应的光谱证据，并应用该技术实现将不同气溶胶颗粒可控地加载到相邻的光阱中。这种方法将能够对气溶胶特性进行比较测量，并有助于研究亚皮升液滴中的气溶胶化学。它还便于将已知成分的孤立液滴用作气溶胶集合体中气相条件的灵敏探针。
