Fabrication of an electrowetting liquid microlens array for a focus tunable integral imaging system

Kim, Cheoljoong; Shin, Dooseub; Koo, Gyohyun; Won, Yong Hyub

doi:10.1364/ol.377865

Cited by 27 publications

(7 citation statements)

References 19 publications

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“…It provides a large extinction ratio of 47 dB with speeds up to 300 Hz. Another focus-tunable integral imaging system based on an electrowetting lens array is demonstrated by Kim et al [ 33 ].…”

Section: Electrowetting Liquid Lensmentioning

confidence: 99%

Electrically Tunable Lenses for Imaging and Light Manipulation

et al. 2023

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Optofluidics seamlessly combines optics and microfluidics together to construct novel devices for microsystems, providing flexible reconfigurability and high compatibility. By taking advantage of mature electronic fabrication techniques and flexible regulation of microfluidics, electrically actuated optofluidics has achieved fantastic optical functions. Generally, the optical function is achieved by electrically modulating the interfaces or movements of microdroplets inside a small chamber. The high refractive index difference (~0.5) at the interfaces between liquid/air or liquid/liquid makes unprecedented optical tunability a reality. They are suitable for optical imaging devices, such as microscope and portable electronic. This paper will review the working principle and recent development of electrical optofluidic devices by electrowetting and dielectrophoresis, including optical lens/microscope, beam steering and in-plane light manipulation. Some methods to improve the lens performance are reviewed. In addition, the applications of electrical microfluidics are also discussed. In order to stimulate the development of electrically controlled liquid lens, two novel designs derived from electrowetting and dielectrophoresis are introduced in this paper.

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Section: Electrowetting Liquid Lensmentioning

confidence: 99%

Electrically Tunable Lenses for Imaging and Light Manipulation

et al. 2023

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“…The electrowetting liquid lens [1,2] is one of the adaptive lens which has adjustable focal length controlled by voltage signal. As an actuation mechanism where the contact angle between electrolyte liquid and dielectric surface can be changed by an external voltage [3,4] , electrowetting-on-dielectric(EWOD) is widely used in many optical devices, such as laser scanning system, microscope and digital display [5][6][7][8][9] . The curvature of the electrolyte liquid surface changes as the contact angle change on the dielectric substrate, which leads to the focal length variations of the liquid lens.…”

Section: Introductionmentioning

confidence: 99%

Depth from focus with electrowetting liquid lens

Zhang,

Hu,

Zhang

2024

MIPPR 2023: Multispectral Image Acquisition, Processing, and Analysis

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Depth from focus and defocus is an effective technique to extract depth information from a set of images, which is called focal stack. In prior studies, this technology was commonly operated on complex laboratory imaging equipment. In this paper, a new imaging system based on electrowetting liquid lens is proposed. Electrowetting liquid lens is one of the adaptive lens which has adjustable focal length controlled by voltage signal. The focal stack can be easily got by sweeping the applied voltage without mechanical moving part. To eliminate the field of view (FOV) variations during the process of capturing focal stack, which is called focal breathing, we proposed an algorithm based on conventional flow concatenation to align focal stack images. We test the proposed imaging system on both laboratory scene and mobile phones, and the experiments demonstrate this imaging system can capture high quality images and shows excellent performance in extracting depth information without complex mechanical structure.

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“…The integral imaging display presents true three‐dimensional (3D) images with continuous viewpoints and full parallax 6–14 . Therefore, the integral imaging display has been employed to realize glass‐free dual‐view 3D display using the space‐multiplexed technology 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Dual‐view integral imaging display based on point light sources

Liu²,

2020

J Soc Info Display

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We propose a dual‐view integral imaging display based on point light sources. The proposed dual‐view integral imaging display is composed of an organic light‐emitting diode and a liquid crystal panel. The point light sources are displayed on the organic light‐emitting diode. The elemental images 1 and 2, which are captured from three‐dimensional scenes 1 and 2, are alternatively aligned on the liquid crystal panel in the horizontal direction. Two adjacent elemental images 1 and 2 are coupled and corresponded to one point light source. The coupled elemental images 1 and 2 are illuminated by the corresponding point light source. It satisfies the practical applications that the viewing zones are respectively located at the left and right of the proposed dual‐view integral imaging display. A prototype of the proposed dual‐view integral imaging display is developed, and good verifying results are obtained.

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Fabrication of an electrowetting liquid microlens array for a focus tunable integral imaging system

Cited by 27 publications

References 19 publications

Electrically Tunable Lenses for Imaging and Light Manipulation

Electrically Tunable Lenses for Imaging and Light Manipulation

Depth from focus with electrowetting liquid lens

Dual‐view integral imaging display based on point light sources

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