Laser beam shaping method based on D2NN metasurface

• Main Authors: JIN LELING, SHEN HUA, JIAO KERONG, TONG RONGJING
• Format: Patent
• Language: Chinese; English
• Published: 08.12.2023
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention discloses a laser beam shaping method based on a D2NN metasurface. The method comprises the specific steps that a laser beam shaping light path and a target light field based on the D2NN metasurface are designed; simulating a propagation process of a light field in a laser beam shaping light path through the D2NN, and sending the input light field into the D2NN to obtain an output light field; training the D2NN according to a difference value between the output light field and the target light field to obtain phase distribution of a D2NN metasurface; simulating the modulation phase of the super-structure atoms based on FDTD to realize full coverage of the phase of the super-structure atoms; the phase distribution of the D2NN metasurface and the modulation phases of the metasurface atoms are paired, and the metasurface atoms are arranged to generate the D2NN metasurface; and laser beam shaping is realized by using a D2NN metasurface. According to the method, the D2NN metasurface is used for achie