Versatile Miniature Tunable Liquid Lenses Using Transparent Graphene Electrodes

Langmuir : the ACS Journal of Surfaces and Colloids
Ali ShahiniMark Ming-Cheng Cheng

Abstract

This paper presents, for the first time, versatile and low-cost miniature liquid lenses with graphene as electrodes. Tunable focal length is achieved by changing the droplet curvature using electrowetting on dielectric (EWOD). Ionic liquid and KCl solution are utilized as lens liquid on the top of a flexible Teflon-coated PDMS/parylene membrane. Transparent and flexible, graphene allows transmission of visible light as well as large deformation of the polymer membrane to achieve requirements for different lens designs and to increase the field of view without damaging of electrodes. The tunable range for the focal length is between 3 and 7 mm for a droplet with a volume of 3 μL. The visualization of bone marrow dendritic cells is demonstrated by the liquid lens system with a high resolution (456 lp/mm).

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Citations

Apr 23, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Omkar D SupekarVictor M Bright
Jan 20, 2018·Bioinspiration & Biomimetics·Axiu CaoSong Hu
May 4, 2017·Bioinspiration & Biomimetics·Ali ShahiniMark Ming-Cheng Cheng
Jan 4, 2018·Biomedical Optics Express·Omkar D SupekarVictor M Bright
Feb 6, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Natalia Ivanova
Aug 3, 2019·Micromachines·Kari L Van GrinsvenHongrui Jiang
Aug 12, 2021·ACS Applied Materials & Interfaces·Ya ZhongLianqing Liu
Nov 10, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Wei Yang LimVictor M Bright

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