Metasurface lens phase optimization method based on long focal depth holographic algorithm and metasurface lens

• Main Authors: WU LIJUN, WU XINEN, WU JIEPENG, LIU JIAXIN, ZHAN YIYU, LI BOYAO, WANG YUNWEI, CHEN HAOHAN, WANG HAO, HUANG YANG, HE MINGLEI
• Format: Patent
• Language: Chinese; English
• Published: 08.03.2024
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHIC PROCESSES OR APPARATUS; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS

The invention relates to a super-structure lens phase optimization method based on a long focal depth holographic algorithm. The method comprises the following steps: dispersing an axial focal plane corresponding to a target working wave band of a super-structure lens into a plurality of diffraction surfaces which have the same focusing light field distribution and are arranged at equal intervals; a three-dimensional holographic algorithm based on a GS algorithm is adopted to carry out Fresnel diffraction transformation processing on the incident light complex amplitude of each diffraction surface, the optimized phase of the previous diffraction surface is used as the incident initial phase of the next diffraction surface, and the holographic phases of all the diffraction surfaces are obtained; the optimal phase distribution matrix of the super-structure lens is obtained by evaluating whether the diffraction surface light intensity distribution corresponding to the holographic phase meets the loop iteration r