Electrically focus-tuneable ultrathin lens for high-resolution square subpixels

Sehong Park; Gilho Lee; Byeongho Park; Youngho Seo; Chae bin Park; Young Tea Chun; Chulmin Joo; Junsuk Rho; Jong Min Kim; James Hone; Seong Chan Jun

doi:10.1038/s41377-020-0329-5

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Electrically focus-tuneable ultrathin lens for high-resolution square subpixels

Original Articles

- Electrically focus-tuneable ultrathin lens for high-resolution square subpixels
- Light: Science & Applications Vol. 9, Issue 4, Pages: 1018-1030(2020)
- Affiliations：
  
  1.School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
  2.Electrical Engineering Division, Engineering Department, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 OFA, UK
  3.Department of Electronic Material Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
  4.Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang 37673, Republic of Korea
  5.Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang 37673, Republic of Korea
  6.Institute for Convergence Research and Education in Advanced Technology, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
  7.Department of Mechanical Engineering, Columbia University, 500 West 120th Street, Mudd 220, New York, NY 10027, USA
- Author bio：
  
  Correspondence: Seong Chan Jun (scj@yonsei.ac.kr)
- Funds：
- DOI：10.1038/s41377-020-0329-5
  CLC：
- Published：2020，
  
  Published Online：05 June 2020，
  
  Received：25 November 2019，
  
  Revised：21 April 2020，
  
  Accepted：06 May 2020
- Accepted：
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Park, S. et al. Electrically focus-tuneable ultrathin lens for high-resolution square subpixels. Light: Science & Applications, 9, 1018-1030 (2020).
DOI：

Park, S. et al. Electrically focus-tuneable ultrathin lens for high-resolution square subpixels. Light: Science & Applications, 9, 1018-1030 (2020). DOI： 10.1038/s41377-020-0329-5.

摘要

Abstract

Owing to the tremendous demands for high-resolution pixel-scale thin lenses in displays

we developed a graphene-based ultrathin square subpixel lens (USSL) capable of electrically tuneable focusing (ETF) with a performance competitive with that of a typical mechanical refractive lens. The fringe field due to a voltage bias in the graphene proves that our ETF-USSL can focus light onto a single point regardless of the wavelength of the visible light—by controlling the carriers at the Dirac point using radially patterned graphene layers

the focal length of the planar structure can be adjusted without changing the curvature or position of the lens. A high focusing efficiency of over 60% at a visible wavelength of 405 nm was achieved with a lens thickness of < 13 nm

and a change of 19.42% in the focal length with a 9% increase in transmission was exhibited under a driving voltage. This design is first presented as an ETF-USSL that can be controlled in pixel units of flat panel displays for visible light. It can be easily applied as an add-on to high resolution

slim displays and provides a new direction for the application of multifunctional autostereoscopic displays.

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