Meem Monjurul, Majumder Apratim, Menon Rajesh
Opt Express. 2018 Oct 15;26(21):26866-26871. doi: 10.1364/OE.26.026866.
At least two lenses are required in imaging systems to adjust focus and magnification and to match the acceptance properties of the image sensor. Here, we demonstrate the tandem use of two millimeter-scale planar diffractive lenses for video and still imaging over the full visible spectrum. First we designed, fabricated, and characterized individual lenses with focal length of 25mm and NA = 0.05. Then, we assembled the lenses with a conventional color CMOS image sensor to demonstrate imaging. Illumination conditions as varied as ambient sunlight, halogen lamp and LED lamps are used. Due to the ease of fabrication of diffractive lenses compared to metalenses, this demonstration will enable future generations of low-cost, lightweight, broadband cameras.
成像系统中至少需要两个透镜来调整焦距和放大倍率，并匹配图像传感器的接收特性。在此，我们展示了两个毫米级平面衍射透镜在整个可见光谱范围内用于视频和静态成像的串联使用。首先，我们设计、制造并表征了焦距为25mm且数值孔径NA = 0.05的单个透镜。然后，我们将这些透镜与传统的彩色互补金属氧化物半导体（CMOS）图像传感器组装在一起进行成像演示。使用了诸如环境阳光、卤素灯和发光二极管（LED）灯等多种照明条件。由于与超表面透镜相比，衍射透镜易于制造，该演示将促成下一代低成本、轻量化、宽带相机的出现。
