期刊
SMALL
卷 14, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703920
关键词
beam deflection; Fresnel zone plates; metaholograms; metasurfaces; ultrathin planar cavities
类别
资金
- Ministry of Science and Technology, Taiwan [MOST-106-2745-M-002-003-ASP]
- Academia Sinica [AS-103-TP-A06]
- National Center for Theoretical Sciences
- NEMS Research Center of National Taiwan University
- National Center for High-Performance Computing, Taiwan
- Research Center for Applied Sciences, Academia Sinica, Taiwan
An ultrathin planar cavity metasurface is proposed based on ultrathin film interference and its practicability for light manipulation in visible region is experimentally demonstrated. Phase of reflected light is modulated by finely adjusting the thickness of amorphous silicon (a-Si) by a few nanometers on an aluminum (Al) substrate via nontrivial phase shifts at the interfaces and interference of multireflections generated from the planar cavity. A phase shift of pi, the basic requirement for two-level phase metasurface systems, can be accomplished with an 8 nm thick difference. For proof of concept, gradient metasurfaces for beam deflection, Fresnel zone plate metalens for light focusing, and metaholograms for image reconstruction are presented, demonstrating polarization-independent and broadband characteristics. This novel mechanism for phase modulation with ultrathin planar cavity provides diverse routes to construct advanced flat optical devices with versatile applications.
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