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Dual-mode reconfigurable focusing using the interface of aqueous and dielectric liquids

Title
Dual-mode reconfigurable focusing using the interface of aqueous and dielectric liquids
Authors
KIM, DONG SUNGKIM, WON KYOUNGLEE, CHANGHOKIM, CHULHONG
POSTECH Authors
KIM, DONG SUNGKIM, CHULHONG
Date Issued
Dec-2017
Publisher
ROYAL SOC CHEMISTRY
Abstract
An optofluidic lens serves as a highly reconfigurable device to manipulate light by using a smoothly curved interface between immiscible liquids. Here we propose a dielectro-optofluidic lens (DOL) that is capable of dual-mode reconfigurable focusing. In this DOL, light focuses through a dielectric liquid-aqueous liquid interface where movement and deformation of the interface are achieved by electrohydrodynamic (EHD) actuation. We initially perform alternating current-EHD actuation of the dielectric liquid to obtain its benefit of frequency-dependent behavior and to prevent electrolysis of the aqueous liquid. Our DOL uniquely operates in two modes, namely, an oscillation mode in the low-frequency regime (< 1 Hz) with a 10 mm focus-tuning range and a static mode in the high-frequency regime (> 10 Hz) with a 1 mm focus-tuning range, which are easily modulated on demand by the frequency range of the applied voltage. We successfully conduct proof-of-concept experiments, including extending the depth-of-field using the oscillation mode to clearly visualize thick targets, and integrating the proposed DOL with a photoacoustic microscope using the static mode to adjust the focal point.
URI
http://oasis.postech.ac.kr/handle/2014.oak/38953
DOI
10.1039/C7LC00759K
ISSN
1473-0189
Article Type
Article
Citation
LAB ON A CHIP, vol. 17, page. 4031 - 4039, 2017-12
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 KIM, DONG SUNG
Dept of Mechanical Enginrg
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