Diverse terahertz wavefront manipulations empowered by the spatially interleaved metasurfaces  

作　　者：Jitao LI Zhen YUE Jie LI Chenglong ZHENG Silei WANG Mengyao LI Yating ZHANG Yan ZHANG Jianquan YAO 

机构地区：[1]School of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China [2]Department of Physics,Capital Normal University,Beijing 100048,China [3]College of Optoelectronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China

出　　处：《Science China(Information Sciences)》2023年第3期226-234,共9页中国科学（信息科学）（英文版）

基　　金：supported by National Key Research and Development Program of China(Grant Nos.2021YFB2800703,2017YFA0700202);National Natural Science Foundation of China(Grant No.61675147);Sichuan Science and Technology Program of China(Grant No.2021ZYD0039).

摘　　要：Optical metasurfaces have advanced approaches for manipulating light information in the spatial domain,in which the spatially interleaved metasurfaces demonstrate the ability to manipulate a more complex wavefront of light than metasurfaces without the spatial interleaving.The potential of the spatially interleaved metasurfaces has not been fully exploited.In this paper,we design the spatially interleaved terahertz(THz)metasurfaces based on the ingenious spatial interleaving principles to develop the diverse THz wavefront manipulations.Four functions are performed,including the orbital angular momentum(OAM)superposition of single-frequency vortex beams,the separate vortex focusing of single-frequency dual beams,the different OAM manipulations of bifrequency beams in different planes,and achromatic focusing.The demonstrated functions prove that the spatially interleaved metasurface can manipulate THz wavefront at both single frequency and bifrequency,which traditional metasurfaces cannot.This work paves the way for diverse THz wavefront manipulations.

关 键 词：TERAHERTZ wavefront manipulations metasurfaces spatial interleaving onformation optics 

分 类 号：O43[机械工程—光学工程]