Design of beam shaping and focusing metasurface device based on G-S algorithm

被引：3
|
作者：
Sun, Yanling [1 ]
He, Daichun [1 ]
Liu, Yan [1 ]
Lin, Cuiping [2 ]
Yuan, Weiqing [1 ]
She, Ying [2 ]
机构：
[1] Yangtze Normal Univ, Sch Elect Informat Engn, Chongqing 408100, Peoples R China
[2] Chongqing Univ, Coll Optoelect Engn, Minist Educ, Key Lab Optoelect Technol & Syst, Chongqing 400044, Peoples R China
来源：
OPTICAL MATERIALS | 2020年 / 109卷
关键词：
Sub-diffraction focusing; Beam shaping; Metasurface; Gerchberg-Saxton algorithm; DIFFRACTIVE OPTICAL-ELEMENTS; SPATIAL LIGHT-MODULATOR;
D O I：
10.1016/j.optmat.2020.110247
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We demonstrate a sub-diffraction flat-top beam shaping device based on sub-wavelength square silicon pillar array at operating wavelength of 10.6 mu m, followed with improved Gerchberg-Saxton (G-S) algorithm to enable the advanced shaping processing capability. The theoretical simulation results show that the device generates a sub-diffraction flat-top optical needle with length of 10.6 cm along the optic axis, and its diffraction efficiency is higher than 90%. Moreover, the focal spot, with a transverse size of 3.5 lambda, is smaller than the diffraction limit of 6.8 lambda. This sub-diffraction beam shaping device with large focal depth has practical applications in laser machining technologies.
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页数：6
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