Yang Tianchi, Liu Yan-Hua, Mu Quanquan, Zhu Ming, Pu Donglin, Chen Linsen, Huang Wenbin
Opt Express. 2019 Mar 4;27(5):7513-7522. doi: 10.1364/OE.27.007513.
A compound-eye imaging system based on the phase diffractive microlens array as a compact observation module is proposed. As compared with the refractive microlens in common compound-eye imaging systems, the diffractive microlens is a flat imaging optics featuring high relative aperture, thin component thickness and compatibility with lithography techniques. As an application, a compact fingerprint imaging module was demonstrated using this compound-eye imaging system. The phase Fresnel microlens array with continuous trough morphology was fabricated via the self-developed gray-scale laser direct write equipment. An image reconstruction method is proposed by extracting the effective image information of each Fresnel microlens, removing the complex signal separator layer from the compound-eye imaging system. The illumination optics is further planarized through the waveguide backlighting and the waveguide functions as the touch panel for fingerprint recording. The novel compound-eye imaging device length was only restricted by the focal length of the microlens with a low limit of 4.12f. The applicability of this novel compound-eye imaging system was further demonstrated by recording the human fingerprint texture, paving ways for various applications as a compact imaging system.
提出了一种基于相位衍射微透镜阵列的复眼成像系统作为紧凑型观测模块。与普通复眼成像系统中的折射微透镜相比，衍射微透镜是一种平面成像光学器件，具有相对孔径大、组件厚度薄以及与光刻技术兼容性好的特点。作为一种应用，利用该复眼成像系统展示了一个紧凑型指纹成像模块。通过自行研制的灰度激光直写设备制备了具有连续凹槽形态的相位菲涅耳微透镜阵列。提出了一种图像重建方法，通过提取每个菲涅耳微透镜的有效图像信息，去除复眼成像系统中的复杂信号分离层。通过波导背光照进一步使照明光学器件平面化，并且该波导用作指纹记录的触摸面板。这种新型复眼成像装置的长度仅受微透镜焦距的限制，下限低至4.12f。通过记录人类指纹纹理进一步证明了这种新型复眼成像系统的适用性，为其作为紧凑型成像系统的各种应用铺平了道路。
