Open AccessUltrathin arrayed camera for high-contrast near-infrared imaging
Author(s) -
Ki-Soo Kim,
Kitae Jang,
Sunghan Bae,
Hyun-Kyung Kim,
Younggil Cha,
Jae-Kwan Ryu,
Yong-Jin Jo,
KiHun Jeong
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.409472
Subject(s) - microlens , materials science , optics , photolithography , image sensor , optoelectronics , near infrared spectroscopy , planar , lens (geology) , cmos sensor , cmos , computer science , physics , computer graphics (images)
We report an ultrathin arrayed camera (UAC) for high-contrast near infrared (NIR) imaging by using microlens arrays with a multilayered light absorber. The UAC consists of a multilayered composite light absorber, inverted microlenses, gap-alumina spacers and a planar CMOS image sensor. The multilayered light absorber was fabricated through lift-off and repeated photolithography processes. The experimental results demonstrate that the image contrast is increased by 4.48 times and the MTF 50 is increased by 2.03 times by eliminating optical noise between microlenses through the light absorber. The NIR imaging of UAC successfully allows distinguishing the security strip of authentic bill and the blood vessel of finger. The ultrathin camera offers a new route for diverse applications in biometric, surveillance, and biomedical imaging.