Bioinspired polarization imager with high dynamic range
Bioinspired polarization imager with high dynamic range
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DOI：
10.1364/optica.5.001240
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发表时间：
2018-10-20
期刊：
影响因子：
10.4
通讯作者：
Gruev, Viktor
中科院分区：
文献类型：
--
作者：
Garcia, Missael;Davis, Tyler;Gruev, Viktor
偏振是光的三个基本性质之一，沿着的是颜色和强度，然而大多数脊椎动物物种，包括人类，对于这种光形态是盲目的。相比之下，许多无脊椎动物，包括昆虫，蜘蛛，头足类动物和口足类动物，已经进化到用高动态范围光敏细胞检测偏振信息，并利用这些信息进行视觉引导行为。在本文中，我们提出了一个高动态范围的偏振成像传感器的灵感来自视觉系统的螳螂虾。我们的生物成像仪在384 x 288像素上实现了140 dB的动态范围和61 dB的最大信噪比，配备了对数光电二极管。与最先进的有源像素传感器相反，其中单个像素中的光电二极管在反向偏置模式下工作，并且产生高达60 dB的动态范围，我们的像素通过在正向偏置模式下工作单个光电二极管而具有对数响应。这种新颖的像素电路与由250 nm高x 75 nm宽的铝纳米线组成的像素化偏振滤波器单片集成，以实现每秒30帧的快照偏振成像。这种传感器可以实现许多汽车和遥感应用，其中，增强偏振信息的高动态范围成像可以在有雾或下雨的条件下提供关键信息。(C)根据OSA开放获取出版协议的条款，2018年美国光学学会
Polarization is one of the three fundamental properties of light, along with color and intensity, yet most vertebrate species, including humans, are blind with respect to this light modality. In contrast, many invertebrates, including insects, spiders, cephalopods, and stomatopods, have evolved to detect polarization information with high-dynamic-range photosensitive cells and utilize this information in visually guided behavior. In this paper, we present a highdynamic-range polarization imaging sensor inspired by the visual system of the mantis shrimp. Our bioinspired imager achieves 140 dB dynamic range and 61 dB maximum signal-to-noise ratio across 384 x 288 pixels equipped with logarithmic photodiodes. Contrary to state-of-the-art active pixel sensors, where photodiodes in individual pixels operate in reverse bias mode and yield up to similar to 60 dB dynamic range, our pixel has a logarithmic response by operating individual photodiodes in forward bias mode. This novel pixel circuitry is monolithically integrated with pixelated polarization filters composed of 250-nm-tall x 75-nm-wide aluminum nanowires to enable snapshot polarization imaging at 30 frames per second. This sensor can enable many automotive and remote sensing applications, where high-dynamic-range imaging augmented with polarization information can provide critical information during hazy or rainy conditions. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement