Micro lenses are small lenses with diameters on the micron scale, arranged in a one-dimensional or two-dimensional periodic array on a substrate to form a microlens array. Micro lens arrays not only possess the basic functions of traditional lenses, such as focusing and imaging, but also feature small size, lightweight, and high integration, enabling them to perform functions that traditional optical elements cannot achieve. Microlens arrays are applied in various fields, including optical information processing, optical interconnects, optical computing, photocopiers, image scanners, cameras, and medical devices. In 3D imaging and display, they are often used to implement light field photography (full light cameras), allowing the camera to bypass the troublesome focusing process before capturing images.