Ultrathin Planar Cavity Metasurfaces

H.-C. Wang, C.H. Chu, P.C. Wu, H.-H. Hsiao, H.J. Wu, J.-W. Chen, W.H. Lee, Y.-C. Lai, Y.-W. Huang, M.L. Tseng, S.-W. Chang, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimAn 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 ?, 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.
Original languageEnglish
Article number1703920
JournalSmall
Volume14
Issue number17
DOIs
Publication statusPublished - 26 Apr 2018
Externally publishedYes

Keywords

  • beam deflection
  • Fresnel zone plates
  • metaholograms
  • metasurfaces
  • ultrathin planar cavities

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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