Helicity-delinked manipulations on surface waves and propagating waves by metasurfaces

Nanophotonics

Chen Yizhen¹  Sun Shulin¹  Dong Shaohua¹  Yi Sixiong¹  Li Shiqing¹  Wang Zhuo²  Guo Huijie²  He Qiong²  Guan Fuxin²  Zhou Lei² 

[1] Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Green Photonics and Department of Optical Science and Engineering, Fudan University, Shanghai, 200433, China;State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai, 200433, China;

关键词: far-field;    helicity;    metasurface;    near-field;    surface wave;   

DOI  :  10.1515/nanoph-2020-0200

来源: DOAJ

【 摘 要 】

Although many approaches have been proposed to manipulate propagating waves (PWs) and surface waves (SWs), usually each operation needs a separate meta-device, being unfavorable for optical integrations. Here, we propose a scheme to design a single meta-device that can efficiently generate SWs and/or PWs with pre-designed wavefronts, under the excitations of circularly polarized (CP) PWs with different helicity. As a proof of concept, we design and fabricate a microwave meta-device and experimentally demonstrate that it can convert incident CP waves of opposite helicity to SWs possessing different wavefronts and traveling to opposite directions, both exhibiting very high efficiencies. We further generalize our scheme to design a meta-device and numerically demonstrate that it can either excite a SW beam with tailored wavefront or generate a far-field PW with pre-designed wavefront, as shined by CP waves with different helicity. Our work opens the door to achieving simultaneous controls on far- and near-field electromagnetic environments based on a single ultra-compact platform.

【 授权许可】

Unknown