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Flexible Electrowetting-on-Dielectric Microlens Array Sheet.

Kari L Van Grinsven1, Alireza Ousati Ashtiani1,2, Hongrui Jiang3,4,5,6

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.

Micromachines
|August 3, 2019
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Summary
This summary is machine-generated.

Flexible liquid lens arrays offer tunable focus and a wider field of view when curved. This reconfigurable optical system uses electrowetting on dielectric (EWOD) actuation for advanced imaging applications.

Keywords:
electrowetting-on-dielectricflexiblelarge field of viewtunable lens arraytunable liquid lens

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microfabrication

Background:

  • Microlens arrays are crucial for advanced optical systems.
  • Liquid lenses offer tunable focal lengths, but integration into flexible arrays remains challenging.
  • Electrowetting on dielectric (EWOD) actuation provides a method for precise control of liquid lens shape.

Purpose of the Study:

  • To fabricate and characterize a fully-flexible, focus-tunable microlens array.
  • To investigate the imaging capabilities and field of view (FOV) of the flexible array.
  • To assess the performance of individual liquid lenses using wavefront sensing.

Main Methods:

  • Fabrication of a microlens array on a polydimethylsiloxane (PDMS) substrate.
  • Individual lens tuning using electrowetting on dielectric (EWOD) actuation.
  • Characterization of focus length tunability (20.2 mm to 9.2 mm) with applied voltage.
  • Measurement of optical performance, including FOV on planar and cylindrical surfaces (21.5° vs. 40.4°).
  • Wavefront analysis using a Shack-Hartmann wavefront sensor (SHWS) to determine Zernike coefficients and assess aberrations.

Main Results:

  • Demonstrated a fully-flexible, focus-tunable microlens array.
  • Achieved a significant increase in FOV from 21.5° on a planar surface to 40.4° when wrapped on a cylindrical surface.
  • Quantified the tunable focus range of individual liquid lenses from 20.2 mm to 9.2 mm.
  • Characterized lens aberrations using SHWS and Zernike coefficients.

Conclusions:

  • The flexible microlens array is a reconfigurable optical system with tunable focus and enhanced FOV.
  • EWOD actuation enables precise control over liquid lens performance in a flexible array.
  • The ability to conform to curved surfaces opens new possibilities for compact and adaptable imaging systems.