Flexible Electrowetting-on-Dielectric Microlens Array Sheet

We have fabricated a fully-flexible, focus-tunable microlens array on a sheet and demonstrated its imaging capabilities. Each liquid lens of the array is individually tunable via electrowetting on dielectric (EWOD) actuation and is situated on a polydimethylsiloxane (PDMS) substrate, which allows th...

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Bibliographic Details
Published in:Micromachines (Basel) 2019-07, Vol.10 (7), p.464
Main Authors: Van Grinsven, Kari L, Ousati Ashtiani, Alireza, Jiang, Hongrui
Format: Article
Language:English
Subjects:
Actuation
Arrays
Contact angle
Electrodes
electrowetting-on-dielectric
Field of view
flexible
large field of view
Microlenses
Polydimethylsiloxane
Shack-Hartmann sensors
Substrates
tunable lens array
tunable liquid lens
Wave front sensors
Wave fronts
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Summary:We have fabricated a fully-flexible, focus-tunable microlens array on a sheet and demonstrated its imaging capabilities. Each liquid lens of the array is individually tunable via electrowetting on dielectric (EWOD) actuation and is situated on a polydimethylsiloxane (PDMS) substrate, which allows the lens array to operate as a reconfigurable optical system. In particular, we observed a significant increase in the field of view (FOV) of the system to 40.4° by wrapping it on a cylindrical surface as compared to the FOV of 21.5° obtained by the array on a planer surface. We also characterized the liquid lenses of the system, observing a range of focus length from 20.2 mm to 9.2 mm as increased voltage was applied to each EWOD lens. A Shack-Hartmann wavefront sensor (SHWS) was used to measure the wavefront of the lens as it was actuated, and the aberrations of the lens were assessed by reporting the Zernike coefficients of the wavefronts.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi10070464