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Inverse-Designed Multi-Level Diffractive Doublet for Wide Field-of-View Imaging

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Download Hi-Res ImageDownload to MS-PowerPointCite This:ACS Photonics 2023, 10, 8, 2661-2669
    Article

    Inverse-Designed Multi-Level Diffractive Doublet for Wide Field-of-View Imaging
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    • Dajun Lin
      Dajun Lin
      Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102, United States
      More by Dajun Lin
      Orcidhttps://orcid.org/0000-0003-2097-2037
    • Tina M. Hayward
      Tina M. Hayward
      Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102, United States
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    • Wei Jia
      Wei Jia
      Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102, United States
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    • Apratim Majumder
      Apratim Majumder
      Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102, United States
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    • Berardi Sensale-Rodriguez
      Berardi Sensale-Rodriguez
      Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102, United States
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      Orcidhttps://orcid.org/0000-0001-7404-1743
    • Rajesh Menon*
      Rajesh Menon
      Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102, United States
      Oblate Optics, Inc., San Diego, California 92130, United States
      *Email: [email protected]
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      Orcidhttps://orcid.org/0000-0002-4777-376X
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    ACS Photonics

    Cite this: ACS Photonics 2023, 10, 8, 2661–2669
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    https://doi.org/10.1021/acsphotonics.3c00406
    Published June 22, 2023
    Copyright © 2023 American Chemical Society
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    Abstract

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    Wide field-of-view (WFOV) imaging is extensively used in fields as diverse as macro photography, virtual reality, machine vision, and microscopy. Conventional WFOV cameras are bulky since they require multiple refractive lenses. Here, we design, fabricate, and characterize a 100° FOV camera with a total-track length of ∼2 mm, composed of an inverse-designed multi-level diffractive doublet with an input-aperture diameter of 0.204 mm, a back-focal length of 1 mm, and operating at λ = 850 nm (bandwidth ∼ 34 nm). Using careful experiments, we characterize the focusing and imaging performance as well as demonstrate de-vignetting based on experimental calibration. The spatial frequency at 10% modulation-transfer-function contrast was measured at 150 and 38 lp/mm for 0 and 50° incident angles, respectively. Our approach can be scaled to larger aperture sizes and smaller f/#s, potentially leading to thin, lightweight WFOV cameras for portable applications.

    Copyright © 2023 American Chemical Society

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    Supporting Information

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    • Details of the inverse design procedure; optical setup for efficiency measurement; comparison of the raw image and vignetting-calibrated image; PSF performance under X, Y, and Z misalignment; light source spectrum; and simulation results of PSF with either one or both MDLs (PDF)

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    ACS Photonics

    Cite this: ACS Photonics 2023, 10, 8, 2661–2669
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsphotonics.3c00406
    Published June 22, 2023
    Copyright © 2023 American Chemical Society
    Request reuse permissions

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