3D Imaging Using Extreme Dispersion in Optical Metasurfaces
3D Imaging Using Extreme Dispersion in Optical Metasurfaces
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DOI：
10.1021/acsphotonics.1c00110
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发表时间：
2021-04-16
期刊：
影响因子：
7
通讯作者：
Naik, Gururaj, V
中科院分区：
文献类型：
--
作者：
Tan, Shiyu;Yang, Frank;Naik, Gururaj, V
超表面因其对入射光的相位、偏振和幅度的极端控制，有可能给成像技术带来革命性的变化。它们依靠增强的光的局部相互作用来实现所需的相位分布。由于增强了光的局部相互作用，变形表面是高度分散的。这种强烈的色散已经被认为是一个主要的限制，因为它涉及到利用超表面实现常规成像。在这里，我们认为这种强烈的分散性增加了计算成像的设计自由度，潜在地开辟了新的应用领域。特别是，我们利用亚曲面的这种强色散特性，提出了一种紧凑、单次拍摄和被动的3D成像相机。我们的设备包括一个金属透镜，用于在不同深度聚焦不同波长，以及两个深层网络，用于从系统获取的彩色散焦图像中恢复深度和RGB纹理信息。与其他基于超表面的3D传感器相比，我们的设计可以在全可见范围内工作，具有更大的视场(FOV)，并且可以潜在地生成复杂3D场景的密集深度图。我们在直径为1 mm的金属透镜上的模拟结果表明，它能够捕捉0.12到0.6m范围内的3D深度和纹理信息。
Metasurfaces have the potential to revolutionize imaging technologies due to their extreme control of phase, polarization, and amplitude of the incident light. They rely upon enhanced local interaction of light to achieve the desired phase profile. As a consequence of the enhanced local interaction of light, metasurfaces are highly dispersive. This strong dispersion has been recognized as a primary limitation as it relates to realizing conventional imaging with metasurfaces. Here, we argue that this strong dispersion is an added degree of design freedom for computational imaging, potentially opening up novel applications. In particular, we exploit this strongly dispersive property of metasurfaces to propose a compact, single-shot, and passive 3D imaging camera. Our device consists of a metalens engineered to focus different wavelengths at different depths and two deep networks to recover depth and RGB texture information from chromatic, defocused images acquired by the system. In contrast with other metasurface-based 3D sensors, our design can operate in the full visible range with a larger field-of-view (FOV) and can potentially generate dense depth maps of complicated 3D scenes. Our simulation results on a 1 mm diameter metalens demonstrate its ability to capture 3D depth and texture information ranging from 0.12 to 0.6 m.