School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Opt Lett. 2009 Dec 1;34(23):3622-4. doi: 10.1364/OL.34.003622.
One of the current problems of micro-optofluidics is the choice of a suitable liquid with a high refractive index (RI). We report the use of a low-RI liquid in a biconcave liquid-core liquid-cladding lens for focusing light. For the characterization of the lens, a telescope system was constructed from polydimethylsiloxane lenses to collimate and expand a light beam emitted from an optical fiber. The tunable optofluidic biconcave lens focuses the parallel beam. Fluorescent dye diluted in an index-matching liquid was used for the visualization of the light rays in a beam-tracing chamber. The focused beam is tuned by adjusting the flow rate ratio between core and cladding streams.
微流控目前面临的问题之一是选择具有高折射率（RI）的合适液体。我们报告了在双凹液体芯液体包层透镜中使用低 RI 液体进行聚焦光的情况。为了对透镜进行表征，构建了一个由聚二甲基硅氧烷透镜组成的望远镜系统，用于准直和扩展光纤发射的光束。可调谐的微流控双凹透镜聚焦平行光束。在光束轨迹室中，用稀释在折射率匹配液体中的荧光染料可视化光线。通过调整芯流和壳流之间的流速比来调节聚焦光束。
