Moghaddam Mohammadreza Salehi, Latifi H, Shahraki Hamidreza, Cheri Mohammad Sadegh
Appl Opt. 2015 Apr 1;54(10):3010-7. doi: 10.1364/AO.54.003010.
Microlenses with tunable focal length have wide applications in optofluidic devices. This work presents a numerical and experimental investigation on a tunable electrowetting-based concave lens. Optical properties such as focal length of the lens and visibility of images were investigated numerically and experimentally. A finite element analysis and a ZEMAX simulation were used for determination of surface profile and focal length of the lens. The results show that the theoretical surface profile and focal length of the lens are in good agreement with the experimental ones. The lens has a wide tuning focal length equal to 6.5 (cm). Because the polydimethylsiloxane (PDMS) layer is wedge shaped (as both the dielectric and hydrophobic layers), lower applied voltage is needed. A commercial program was used to find the focal length of the lens from maximum visibility value by tuning the applied voltage.
焦距可调的微透镜在光流体装置中有广泛应用。这项工作对基于电润湿的可调凹透镜进行了数值和实验研究。对透镜的焦距和图像清晰度等光学特性进行了数值和实验研究。使用有限元分析和ZEMAX模拟来确定透镜的表面轮廓和焦距。结果表明，透镜的理论表面轮廓和焦距与实验结果吻合良好。该透镜具有6.5厘米的宽焦距调谐范围。由于聚二甲基硅氧烷（PDMS）层呈楔形（作为介电层和疏水层），所需施加的电压较低。通过调整施加电压，使用商业程序从最大清晰度值求出透镜的焦距。
