Spin-dependent amplitude and phase modulation with multifold interferences via single-layer diatomic all-silicon metasurfaces  

作　　者：Hui Li Chenhui Zhao Jie Li Hang Xu Wenhui Xu Qi Tan Chunyu Song Yun Shen Jianquan Yao 

机构地区：[1]Key Laboratory of Opto-Electronics Information Technology(Tianjin University),Ministry of Education,School of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China [2]Department of Physics,School of Physics and Materials Science,Nanchang University,Nanchang 330031,China [3]Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center,Chengdu University of Information Technology,Chengdu 610225,China

出　　处：《Opto-Electronic Science》2025年第3期2-15,共14页光电科学(英文)

基　　金：supports from National Key Research and Development Program of China(2021YFB2800703);Sichuan Province Science and Technology Support Program(25QNJJ2419);National Natural Science Foundation of China(U22A2008,12404484);Laoshan Laboratory Science and Technology Innovation Project(LSKJ202200801).

摘　　要：Diatomic metasurfaces designed for interferometric mechanisms possess significant potential for the multidimensional manipulation of electromagnetic waves,including control over amplitude,phase,frequency,and polarization.Geometric phase profiles with spin-selective properties are commonly associated with wavefront modulation,allowing the implementation of conjugate strategies within orthogonal circularly polarized channels.Simultaneous control of these characteristics in a single-layered diatomic metasurface will be an apparent technological extension.Here,spin-selective modulation of terahertz(THz)beams is realized by assembling a pair of meta-atoms with birefringent effects.The distinct modulation functions arise from geometric phase profiles characterized by multiple rotational properties,which introduce independent parametric factors that elucidate their physical significance.By arranging the key parameters,the proposed design strategy can be employed to realize independent amplitude and phase manipulation.A series of THz metasurface samples with specific modulation functions are characterized,experimentally demonstrating the accuracy of on-demand manipulation.This research paves the way for all-silicon meta-optics that may have great potential in imaging,sensing and detection.

关 键 词：diatomic metasurface geometric phase complex amplitude modulation spin-selective 

分 类 号：O441.4[理学—电磁学]