[논문]High Contrast Ultrathin Light‐Field Camera Using Inverted Microlens Arrays with Metal-Insulator-Metal Optical Absorber

Bae, Sang‐; In; Kim, Kisoo; Jang, Kyung‐; Won; Kim, Hyun‐; Kyung; Jeong, Ki‐; Hun

doi:10.1002/adom.202001657

[해외논문] High Contrast Ultrathin Light‐Field Camera Using Inverted Microlens Arrays with Metal-Insulator-Metal Optical Absorber 원문보기

Advanced optical materials, v.9 no.6, 2021년, pp.2001657 -

Bae, Sang‐In (Department of Bio and Brain Engineering KAIST Institute of Health Science and Technology (KIHST) Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak‐) , Kim, Kisoo (ro, Yuseong‐) , Jang, Kyung‐Won (gu Daejeon 34141 Republic of Korea) , Kim, Hyun‐Kyung (Department of Bio and Brain Engineering KAIST Institute of Health Science and Technology (KIHST) Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak‐) , Jeong, Ki‐Hun (ro, Yuseong‐)

Abstract ▼ AI-Helper

AbstractLight‐field imaging has attracted much attention in constructing 3D objects with a simple configuration and capturing all the spatial and directional data in a single photographic exposure. Here, an ultrathin light‐field camera (ULFC) for high contrast and high‐resolution light‐field imaging using a metal-insulator-metal optical absorber based inverted microlens arrays (MIM‐iMLA) is reported. A metal-insulator-metal based optical absorber (MIM‐OA) between microlenses exhibits high light absorption in the full visible region, thereby highly blocking microlens crosstalk. The MIM‐iMLA double the image contrast and improve MTF50 by up to 32%, compared to conventional light‐field image. In addition, the MIM‐iMLA substantially reduces an image plane distance and brings the objective lens position closer to the MLA. The ULFC exhibits a short total track length of 5.1 mm, demonstrating high contrast light‐field image acquisition and high accuracy 3D depth map estimation after light‐field rendering. This ultrathin and high contrast light‐field camera can provide a new platform for miniaturized 3D cameras in biomedical applications, biometrics, automated inspection, or mobile camera applications.

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