Scholarlink

<p>Conventional imaging relies on both lenses and free-space propagation. Despite recent advancements, a thickness limit was established for conventional translationally-variant imaging systems based on the nonlocality required for image formation. We bypass this limit with an imaging system composed of a single, 12.2-µm-thick dielectric film placed directly on an image sensor, eliminating both lenses and free space. By engineering nonlocal Fabry–Pérot resonances, which allows light to spread and interfere constructively across the film’s surface, our multilayer film effectively assigns an individual aperture to each object point, bypassing the single-aperture assumption that dictates the thickness limit in conventional optics. We experimentally demonstrate deterministic, computation-free 2D imaging with sub-100-μm resolution. Furthermore, the system’s functionality is dynamically reconfigurable; by simply tuning the illumination wavelength, we achieve depth-resolved 3D imaging and perform optical diffraction tomography to reconstruct 3D refractive index profiles. This lensless platform establishes a new paradigm for ultracompact, multifunctional optical systems with potential applications in endoscopy, machine vision, and wearable sensors.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Bypassing the imaging thickness limit with a translationally-invariant nonlocal thin film

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年8月5日

查看全文
  • Bohan Zhang,
  • Liu Li,
  • Xinyuan Xue,
  • Yibao Xu,
  • Qitong Li,
  • Hao Zhang,
  • Liqun Sun,
  • Liangcai Cao,
  • Yuanmu Yang

摘要

Conventional imaging relies on both lenses and free-space propagation. Despite recent advancements, a thickness limit was established for conventional translationally-variant imaging systems based on the nonlocality required for image formation. We bypass this limit with an imaging system composed of a single, 12.2-µm-thick dielectric film placed directly on an image sensor, eliminating both lenses and free space. By engineering nonlocal Fabry–Pérot resonances, which allows light to spread and interfere constructively across the film’s surface, our multilayer film effectively assigns an individual aperture to each object point, bypassing the single-aperture assumption that dictates the thickness limit in conventional optics. We experimentally demonstrate deterministic, computation-free 2D imaging with sub-100-μm resolution. Furthermore, the system’s functionality is dynamically reconfigurable; by simply tuning the illumination wavelength, we achieve depth-resolved 3D imaging and perform optical diffraction tomography to reconstruct 3D refractive index profiles. This lensless platform establishes a new paradigm for ultracompact, multifunctional optical systems with potential applications in endoscopy, machine vision, and wearable sensors.