设计并制作了一种基于聚二甲基硅氧烷(Polydimethylsiloxane，PDMS)基片的可变焦微型柱透镜。这种柱透镜主要由一根埋入PDMS基片中的玻璃毛细管构成，通过选择毛细管内液体的折射率实现变焦功能。液体折射率为1.451 8~1.550 2时，柱透镜焦距可由21.369 mm减小到3.362 mm，变焦倍数达到6.4倍。用散射光成像方法观察并拍摄了平行光通过这种可变焦柱透镜后的光线轨迹图; 用ZEMAX光学设计软件摸拟了成像过程，模拟结果和实验图像相符; 用高斯光学的逐次成像方法推导出了这种柱透镜的焦距公式，焦距的计算结果和实验以及模拟结果吻合。PDMS基片中可变焦微型柱透镜的成功制作，为“芯片上的实验室”提供了一种重要的光学成像元件。

The variable-focus cylindrical lens based on a Polydimethylsiloxane(PDMS) chip is designed and fabricated, which is composed mainly by a glass capillary embedded in a soft PDMS chip, and the focal length varies by selecting different liquids filled into the glass capillary. When the refractive index of liquid changes in the range of 1.451 8 to 1.550 2, the focal length varies from 21.369 to 3.362 mm, which reaches a 6.4× zoom ratio. With light-scattering imaging method, the ray traces of parallel light passing through various lenses are viewed and photographed. The imaging processes are simulated by using the ZEMAX optical design software, and the simulated results are consistent with the experimental photographs. The focal length formula of a glass capillary buried in PDMS chip is derived with the Gaussian optical successive imaging method, and is verified by the simulated method and experimental results. The successful fabrication of the variable-focus cylindrical lens based on PDMS substrate provides an important optical imaging element for “lab on a chip”.