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15 November 2018 A multi-regions electrically tunable liquid crystal microlens array for extending the depth of field
Mingce Chen, Zhaowei Xin, Dong Wei, XingWang Xie, Xinyu Zhang, Haiwei Wang, Changsheng Xie
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Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109644J (2018) https://doi.org/10.1117/12.2506112
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China
Abstract
Depth of field (DOF), which is also called the effective focusing range, is a basic parameter for imaging systems. Usually, after the focusing, a clear image acceptable within a certain range before and after the focus is expressed. The length of this range is called the DOF. According to the definition of DOF, for a lens with a fixed focal length, the image formed by an object outside the depth of field is blurred, which means that sufficient information will not be obtained. For conventional imaging systems, a relatively large DOF can be achieved by reducing the aperture, but this will reduce the amount of incident light, thereby reducing the system imaging quality. In this paper, we propose a multi-regions electrically tunable liquid crystal microlens array (LCMLA), which is fabricated according to traditional photolithography and standard microelectronic techniques and divided into three sub-regions with three independent electrodes. It can apply different voltages on different sub-regions to obtain different DOF corresponding to them. Based on this, it will be possible to clearly image objects in field of view (FOV) that are outside the depth of field of one or more sub-regions at the same time, which means an extension of the DOF.
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Mingce Chen, Zhaowei Xin, Dong Wei, XingWang Xie, Xinyu Zhang, Haiwei Wang, and Changsheng Xie "A multi-regions electrically tunable liquid crystal microlens array for extending the depth of field", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109644J (15 November 2018); https://doi.org/10.1117/12.2506112
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KEYWORDS
Liquid crystals
Imaging systems
Electrodes
Microlens
Refractive index
Microlens array
Point spread functions
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