Li Lei, Kuang Feng-Lin, Wang Jin-Hui, Zhou Yin, Wang Qiong-Hua
Opt Express. 2021 Jan 18;29(2):2135-2141. doi: 10.1364/OE.415483.
We propose a zoom liquid lens employing a multifocal Fresnel zone plate. The proposed lens has two optical surfaces: liquid-liquid interface and Fresnel zone plate. The Fresnel zone plate is designed to have a multifocal point and an increased depth of focus. Therefore, the proposed lens has two obvious advantages. Due to increased depth of focus, the proposed lens can realize zooming using only one tunable liquid-liquid interface, which is not available for conventional liquid lens. Thus, it is possible to remove conventional zooming mechanisms from cameras. Besides, the focal length tuning range is also increased, and a lens system based on the proposed lens can simultaneously collect two images with different magnifications. We present the design, fabrication and characterization of the proposed lens. The shortest positive and negative focal length are ∼17.5mm and ∼-34.5mm and the diameter is 5mm. The zoom ratio of the proposed lens reaches ∼1.48×. Our results confirm that the proposed lens has widespread applications in imaging system.
我们提出了一种采用多焦点菲涅尔波带片的变焦液体透镜。所提出的透镜有两个光学表面：液 - 液界面和菲涅尔波带片。菲涅尔波带片被设计成具有多个焦点和增加的焦深。因此，所提出的透镜有两个明显的优点。由于焦深增加，所提出的透镜仅使用一个可调谐的液 - 液界面就能实现变焦，而传统液体透镜无法做到这一点。因此，有可能从相机中去除传统的变焦机构。此外，焦距调谐范围也增加了，基于所提出的透镜的透镜系统可以同时采集具有不同放大倍率的两幅图像。我们展示了所提出透镜的设计、制造和特性。最短的正焦距和负焦距分别约为17.5毫米和约 - 34.5毫米，直径为5毫米。所提出透镜的变焦比达到约1.48倍。我们的结果证实所提出的透镜在成像系统中有广泛的应用。
