4.6 Article

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

Journal

ADVANCED OPTICAL MATERIALS
Volume 9, Issue 6, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202001657

Keywords

depth estimation; high resolution; light-field camera; metal-insulator-metal absorber; microlens arrays

Funding

  1. National Research Foundation of Korea - Ministry of Science and ICT [2016R1A2B301306115]
  2. Technology Innovation Program - Ministry of Trade, Industry and Energy [20012464]
  3. Ministry of Health & Welfare, Republic of Korea [HI16C1111010020]
  4. Korea Health Promotion Institute [HI16C1111010020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The ultrathin and high contrast light-field camera uses a metal-insulator-metal optical absorber to improve light absorption, image contrast, and depth map estimation for 3D imaging applications.
Light-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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