Journal
OPTICS EXPRESS
Volume 28, Issue 7, Pages 9082-9088Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.388921
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Funding
- National Research Foundation of Korea [2019023700]
- Ministry of Health and Welfare [HI16C1111]
- Pemtron Co., Ltd.
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We report a new microfabrication method of multifocal microlens arrays (MF-MLAs) for extended depth-of-field (DoF) using multilayer photolithography and thermal reflow. Microlenses of different focal lengths were simultaneously fabricated on a single glass wafer by using repeated photolithography with multiple photomasks to define microposts of different thicknesses and concurrent thermal reflow of multi-stacked microposts. The diverse lens curvatures of MF-MLAs are precisely controlled by the thickness of the micropost. Hexagonally packaged MF-MLAs clearly show three different focal lengths of 249 mu m, 310 mu m, and 460 mu m for 200 mu m in lens diameter and result in multifocal images on a single image sensor. This method provides a new route for developing various three-dimensional (3D) imaging applications such as light-field cameras or 3D medical endoscopes. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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