All-dielectric metasurfaces capable of dual-channel complex amplitude modulation

Nanophotonics

Wang Guocui¹  Zhang Yan²  Liu Jingyu²  Zheng Chenglong³  Li Jie³  Yue Zhen³  Zhao Hongliang³  Li Jitao³  Hao Xuanruo³  Yao Jianquan³  Zhang Yating³ 

[1] Beijing Engineering Research Center for Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China;Department of Physics, Beijing Key Laboratory for Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, and Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048, China;Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, No. 92 WeiJin Road, Tianjin, 300072, China;

关键词: all-dielectric metasurface;    complex amplitude modulation;    decoupling;    terahertz;   

DOI  :  10.1515/nanoph-2021-0349

来源: DOAJ

【 摘 要 】

One compound metasurface with multiple functions and precise complex amplitude modulation is beneficial to photonic integration. Here, all-silicon bifunctional metasurfaces capable of independent amplitude and phase modulation in two circular polarized channels are proposed, which encode complex amplitude information by integrating propagation phase and Pancharatnam-Berry phase. A switchable power-controllable axial bifocal metalens directly illustrates the feasibility of the proposed modulation scheme. Another switchable power-controllable horizontal/vertical bifocal metalens characterizes the versatility and flexibility of this approach. The experimental results agree well with the simulations and theoretical expectations. In addition, we also discuss the broadband performance of the proposed metalens and the dynamic focusing behavior under optical pumping. The proposed approach can directly generate editable amplitude and phase profiles and can find applications in dynamic holography, dynamic display, and other fields.

【 授权许可】

Unknown