Ultrathin Planar Cavity Metasurfaces

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Hsiang-Chu Wang
  • Cheng Hung Chu
  • Pin Chieh Wu
  • Hui-Hsin Hsiao
  • Hui Jun Wu
  • Jia-Wern Chen
  • Wei Hou Lee
  • Yi-Chieh Lai
  • Yao-Wei Huang
  • Ming Lun Tseng
  • Shu-Wei Chang


Original languageEnglish
Article number1703920
Journal / PublicationSmall
Issue number17
Publication statusPublished - 26 Apr 2018
Externally publishedYes


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.

Research Area(s)

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

Bibliographic Note

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Citation Format(s)

Ultrathin Planar Cavity Metasurfaces. / Wang, Hsiang-Chu; Chu, Cheng Hung; Wu, Pin Chieh; Hsiao, Hui-Hsin; Wu, Hui Jun; Chen, Jia-Wern; Lee, Wei Hou; Lai, Yi-Chieh; Huang, Yao-Wei; Tseng, Ming Lun; Chang, Shu-Wei; Tsai, Din Ping.

In: Small, Vol. 14, No. 17, 1703920, 26.04.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review