https://scholars.lib.ntu.edu.tw/handle/123456789/621109
標題: | Ultrathin Planar Cavity Metasurfaces | 作者: | Wang H.-C. Chu C.H. Wu P.C. Hsiao H.-H. Wu H.J. Chen J.-W. Lee W.H. Lai Y.-C. Huang Y.-W. Tseng M.L. Chang S.-W. Tsai D.P. HUI-HSIN HSIAO |
關鍵字: | beam deflection; Fresnel zone plates; metaholograms; metasurfaces; ultrathin planar cavities | 公開日期: | 2018 | 卷: | 14 | 期: | 17 | 來源出版物: | Small | 摘要: | 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 π, 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. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85044737352&doi=10.1002%2fsmll.201703920&partnerID=40&md5=746ebf277394f6a7db965f8be7dec8f2 https://scholars.lib.ntu.edu.tw/handle/123456789/621109 |
DOI: | 10.1002/smll.201703920 | SDG/關鍵字: | Image reconstruction; Interfaces (materials); Plates (structural components); Ultrathin films; Beam deflection; Fresnel zone plate; Metaholograms; Metasurfaces; Planar cavities; Amorphous silicon |
顯示於: | 工程科學及海洋工程學系 |
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