Ultrathin Planar Cavity Metasurfaces

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; Din Ping Tsai

doi:10.1002/smll.201703920

Ultrathin Planar Cavity Metasurfaces

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, Din Ping Tsai^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

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.

Original language	English
Article number	1703920
Journal	Small
Volume	14
Issue number	17
DOIs	https://doi.org/10.1002/smll.201703920
Publication status	Published - 2018 Apr 26
Externally published	Yes

Keywords

Fresnel zone plates
beam deflection
metaholograms
metasurfaces
ultrathin planar cavities

ASJC Scopus subject areas

General Chemistry
Biotechnology
General Materials Science
Biomaterials

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10.1002/smll.201703920

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title = "Ultrathin Planar Cavity Metasurfaces",

abstract = "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.",

keywords = "Fresnel zone plates, beam deflection, metaholograms, metasurfaces, ultrathin planar cavities",

author = "Wang, {Hsiang Chu} and Chu, {Cheng Hung} and Wu, {Pin Chieh} and Hsiao, {Hui Hsin} and Wu, {Hui Jun} and Chen, {Jia Wern} and Lee, {Wei Hou} and Lai, {Yi Chieh} and Huang, {Yao Wei} and Tseng, {Ming Lun} and Chang, {Shu Wei} and Tsai, {Din Ping}",

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year = "2018",

month = apr,

day = "26",

doi = "10.1002/smll.201703920",

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AU - Wang, Hsiang Chu

AU - Chu, Cheng Hung

AU - Wu, Pin Chieh

AU - Hsiao, Hui Hsin

AU - Wu, Hui Jun

AU - Chen, Jia Wern

AU - Lee, Wei Hou

AU - Lai, Yi Chieh

AU - Huang, Yao Wei

AU - Tseng, Ming Lun

AU - Chang, Shu Wei

AU - Tsai, Din Ping

PY - 2018/4/26

Y1 - 2018/4/26

N2 - 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.

AB - 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.

KW - Fresnel zone plates

KW - beam deflection

KW - metaholograms

KW - metasurfaces

KW - ultrathin planar cavities

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Ultrathin Planar Cavity Metasurfaces

Abstract

Keywords

ASJC Scopus subject areas

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