Beam shaping-based design for optical imaging lens

In this paper, a beam shaping-based method for design of optical imaging lens is proposed. The optical imaging lens is designed with Fresnel diffraction theory to focus light, and the focusing parameters of the lens, such as the number of the foci, the focal length, the size and the shape of the focal spot, and so on, can be set with great freedom. Therefore, the lens has great flexibility in optical imaging, and the imaging resolution can also be varied with the design. The optical imaging lenses possess advantages such as simple structure, compact size, customized imaging effect, and high performance. The proposed method can be extensively applied to the design of flat optical elements and the customized optical imaging.