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Helicity‐Dependent Multifunctional Metasurfaces for Full‐Space Wave Control
Author(s) -
Zhang Chiben,
Wang Guangming,
Xu HeXiu,
Zhang Xin,
Li HaiPeng
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901719
Subject(s) - wavefront , helicity , metamaterial , resonator , optics , split ring resonator , geometric phase , reflection (computer programming) , phase (matter) , space (punctuation) , transmission (telecommunications) , physics , topology (electrical circuits) , materials science , computer science , telecommunications , mathematics , particle physics , quantum mechanics , combinatorics , programming language , operating system
Full‐space manipulation of electromagnetic waves with a thin flat plate is particularly intriguing for large‐angle scanning, functionality integration, and data capacity applications. However, majority of the designs to date are confined to linearly‐polarized wave operations; these render the versatile full‐space device operating under circularly‐polarized waves unaddressed due to the critical issue of the geometric phase being hardly decoupled among reflections and transmissions. Herein, a strategy for a helicity‐dependent multifunctional design by sandwiching dual‐layer geometric phase metasurfaces with a bandpass frequency selective surface is reported. The top and bottom metasurfaces are composed of two different types of meta‐structures, split ring resonators (SRRs) and a modified H‐shaped structure, which enable triple‐independent wavefronts at lower and upper frequencies ( f 1 and f 2 ). At f 1 , the top and bottom SRRs operate under reflection mode on both sides, and two distinctive wavefronts can be modulated by individually rotating the orientations of SRRs. However, at f 2 , the modified H‐shaped structure operates in transmission geometry, and additional functionality can be independently modulated by changing their orientations. As a proof of concept, a multifunctional meta‐device is constructed with triple‐versatile functionalities. The approach followed in this study sets up a solid platform for arbitrary helicity‐dependent full‐space integrated devices.