Surface profiling of an aspherical liquid lens with a varied thickness membrane
Surface profiling of an aspherical liquid lens with a varied thickness membrane
复制标题
具有不同厚度薄膜的非球面液体透镜的表面轮廓
DOI：
10.1364/oe.25.003122
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发表时间：
2017-02-20
期刊：
影响因子：
3.8
通讯作者：
Qiao, Wen
中科院分区：
文献类型：
--
作者：
Ding, Zengqian;Wang, Chinhua;Qiao, Wen
Inspired by crystalline lenses in human eyes, liquid lenses have a simple yet elegant working principle, and result in compact optical systems. Recent numerical studies showed that membranes with variable thicknesses could affect the lens profile. However, fabrication and assembly of a liquid lens with an inhomogeneous membrane is difficult. There is also a lack of experimental studies about the changes of a lens profile during deformation. In this paper, we provided a new experimental approach for characterizing the performance of a liquid lens with an inhomogeneous membrane. A 2D axisymmetric lens model was built in finite element analysis software to theoretically study the non-linear deformation behavior of the inhomogeneous membrane. Then we provided a new approach to fabricate inhomogeneous membranes using a pre-machined aluminum mold. An optical coherence tomography (OCT) system was used to dynamically measure the changes of a lens profile without contact. Both simulation and the experiments indicated that the variation of the thickness of the membrane could affect the lens profile in a predictable manner. A negative conic constant was achieved when a plano-concave membrane was adopted in a liquid lens. Larger increments of the thickness of the membrane in the radial direction resulted in a larger contribution of a conic constant to the lens profile. The presented study offers guidance for image-quality analysis and optimization of a liquid-lens-based optical system. (C) 2017 Optical Society of America
