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Nonlocal flat optics for size-selective image processing and denoising

Author

Listed:
  • Sandeep Kumar Chamoli

    (Changchun
    University of Chinese Academy of Sciences)

  • Chunqi Jin

    (Changchun
    University of Chinese Academy of Sciences)

  • Yandong Fan

    (Changchun
    University of Chinese Academy of Sciences)

  • Mehdi Kiani

    (City University of New York
    Graduate Center of the City University of New York)

  • Heedong Goh

    (City University of New York)

  • Chen Huang

    (Changchun
    University of Chinese Academy of Sciences)

  • Shuyu Guo

    (Jilin University)

  • Yuntong Wang

    (Changchun
    University of Chinese Academy of Sciences)

  • Fei Zhu

    (Changchun
    University of Chinese Academy of Sciences)

  • Guohua Xing

    (Changchun
    University of Chinese Academy of Sciences)

  • Bo Li

    (Changchun
    University of Chinese Academy of Sciences)

  • Tian Bai

    (Jilin University)

  • Andrea Alù

    (City University of New York
    Graduate Center of the City University of New York)

  • Wei Li

    (Changchun
    University of Chinese Academy of Sciences)

Abstract

All-optical image processing based on metasurfaces is a swiftly advancing field of technology, due to its high speed, large integrability and inherently low energy requirements. So far, the proposed devices have been focusing on canonical operations, such as differentiations to perform edge detection across all objects in a complex scene. Yet, undesired background noise and clutter can hinder such operations, requiring target selection with digital post-processing which inherently limits the overall accuracy, efficiency and speed. Here, we introduce an optical solution for real-time size-selective image processing and experimentally demonstrate the concept with a metal-dielectric-metal film performing a spatial band-pass filter in momentum space. We show high-resolution (~0.9 μm) edge detection and real-time dynamic denoising, ideally suited for bio-imaging applications and target recognitions. Our demonstrated k-space filtering metasurface expands the scope of nonlocal flat optics for analog image processing, ushering in opportunities for ultra-compact, cost-effective, and multifunctional image processors.

Suggested Citation

  • Sandeep Kumar Chamoli & Chunqi Jin & Yandong Fan & Mehdi Kiani & Heedong Goh & Chen Huang & Shuyu Guo & Yuntong Wang & Fei Zhu & Guohua Xing & Bo Li & Tian Bai & Andrea Alù & Wei Li, 2025. "Nonlocal flat optics for size-selective image processing and denoising," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59765-4
    DOI: 10.1038/s41467-025-59765-4
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