基于超表面光场调控的阵列局域空心光束研究  

Multiple Bottle Beams Based on Metasurface Light Field Control

作　　者：张希纯 吕金光[2] 张崇 付文升 赵鑫 李卫岩 张贺 Zhang Xichun;LüJinguang;Zhang Chong;Fu Wensheng;Zhao Xin;Li Weiyan;Zhang He(State Key Laboratory of High Power Semiconductor Lasers,Changchun University of Science and Technology,Changchun,Jilin 130022,China;State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,Jilin 130033,China;The First Military Representative Office of the Army in Changchun,Changchun,Jilin 130033,China)

机构地区：[1]长春理工大学高功率半导体激光器国家重点实验室,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [3]陆军驻长春地区第一军事代表室,吉林长春130000

出　　处：《中国激光》2021年第21期79-87,共9页Chinese Journal of Lasers

基　　金：应用光学国家重点实验室开放基金(SKLA02020001A17)。

摘　　要：设计了一种能够产生阵列局域空心光束的超表面透镜。该透镜基于几何相位原理,通过调整二氧化钛纳米单元的长宽比以及旋转角度能够实现对波前的精确控制。超表面在波长为632.8 nm的左旋圆偏振光照射下,能够产生多个微米级的局域空心光束,并且可以通过控制环形障碍物的尺寸来改变产生局域空心光束的数量。该超表面透镜也可以通过改变相对孔径值(RA)来控制局域空心光束的横向和纵向半峰全宽的尺寸,进而产生所需尺寸的阵列局域空心光束。Objective Recent studies have shown that the optical system that produces the bottle beam is gradually diversifying.However,most optical systems are more complex and the resulting bottle beams are larger in size.This article uses the metasurface to generate a bottle beam.The ultrasurface system is straightforward and well-integrated.The lateral and longitudinal inner diameters of the generated bottle beam are considerably reduced,and the capture of tiny particles is more accurate.This has potential research and application value for multiparticle capture and precise capture.Methods In this study,to generate multiple bottle beams,an opaque annular obstacle is added to the metasurface with the hyperbolic phase distribution(PB phase).The metasurface is constructed with titanium dioxide(TiO_(2))nanopillars arranged on a silicon dioxide(SiO_(2))substrate.To design the working wavelength of the nanopillars to 632.8 nm,the length,width,and height of the super surface nanopillars are designed to be 377,87,and 600 nm,respectively.Moreover,by varying the relative aperture value(RA)of the metasurface,the lateral and longitudinal inner diameters of the bottle beam are altered.The number of bottle beams produced can be altered by changing the size of the annular obstacle on the metasurface.Results and Discussions This article produced four micron-level bottle beams[Fig.6(a)].Further,by increasing the RA value of the metasurface,the lateral and longitudinal inner diameters of the bottle beams are reduced[Fig.7(a)].Thus,the RA value of the metasurface can be changed to alter the size of the generated light field.We select one of the bottle beams and observe that its transverse and radial full width at half maximum(FWHM)are roughly linear with RA[Fig.7(b)--(c)].In this paper,the number of bottle beams produced is changed by changing the size of the annular obstacle on the metasurface[Fig.8(a)--(c)].Conclusions The metasurface method used in this paper generates four bottle beams.Two of the bottle beams are selected.The measured

关 键 词：物理光学 局域空心光束 超表面 几何相位 干涉 

分 类 号：O436[机械工程—光学工程]