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Metalens-Based Miniaturized Optical Systems

1,2, 2,3 and 1,2,4,*
1
Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48823, USA
2
Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI 48823, USA
3
Department of Biomedical Engineering, Faculty of Engineering King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand
4
Department of Biomedical Engineering, Michigan State University, East Lansing, MI 48823, USA
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(5), 310; https://doi.org/10.3390/mi10050310
Received: 31 March 2019 / Revised: 29 April 2019 / Accepted: 4 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Optical MEMS)
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Abstract

Metasurfaces have been studied and widely applied to optical systems. A metasurface-based flat lens (metalens) holds promise in wave-front engineering for multiple applications. The metalens has become a breakthrough technology for miniaturized optical system development, due to its outstanding characteristics, such as ultrathinness and cost-effectiveness. Compared to conventional macro- or meso-scale optics manufacturing methods, the micro-machining process for metalenses is relatively straightforward and more suitable for mass production. Due to their remarkable abilities and superior optical performance, metalenses in refractive or diffractive mode could potentially replace traditional optics. In this review, we give a brief overview of the most recent studies on metalenses and their applications with a specific focus on miniaturized optical imaging and sensing systems. We discuss approaches for overcoming technical challenges in the bio-optics field, including a large field of view (FOV), chromatic aberration, and high-resolution imaging. View Full-Text
Keywords: metasurface; metalens; field of view (FOV); achromatic; Huygens’ metalens; bio-optical imaging; optical coherence tomography; confocal; two-photon; spectrometer metasurface; metalens; field of view (FOV); achromatic; Huygens’ metalens; bio-optical imaging; optical coherence tomography; confocal; two-photon; spectrometer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, B.; Piyawattanametha, W.; Qiu, Z. Metalens-Based Miniaturized Optical Systems. Micromachines 2019, 10, 310.

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