Patchwork metasurface quantum well photodetectors with broadened photoresponse
Patchwork metasurface quantum well photodetectors with broadened photoresponse
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DOI：
10.1364/oe.408515
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发表时间：
2021-01-04
期刊：
影响因子：
3.8
通讯作者：
Miyazaki, Hideki T.
中科院分区：
文献类型：
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作者：
Hainey, Mel F., Jr.;Mano, Takaaki;Miyazaki, Hideki T.
基于横向排列的不同几何形状的金属-电介质-金属腔的超表面已经实现了复杂的光波操纵，例如宽带吸收。然而，通过结合功能电介质将这些超表面应用于光电器件仍然具有挑战性。在这里，我们将量子阱红外光电探测器（QWIP）与超表面集成在一起，超表面由不同尺寸的方形腔拼凑而成，排列在亚波长晶胞中。我们的探测器实现了接近 QWIP 整个响应光谱的宽带光响应——单一尺寸的方形腔只能利用 60% 的可能带宽——在 6.8 μm 时外部量子效率高达 78%。我们高度灵活的设计方案能够将光电探测器和超表面与任意排列的腔体集成，选择性地响应特定波前的入射。 (c) 2020 年美国光学协会根据 OSA 开放获取出版协议的条款
Complex lightwave manipulation such as broadband absorption has been realized with metasurfaces based on laterally arranged metal-dielectric-metal cavities with different geometries. However, application of these metasurfaces for optoelectronic devices by incorporating functional dielectrics remains challenging. Here, we integrate a quantum well infrared photodetector (QWIP) with a metasurface made of a patchwork of square cavities with different dimensions arranged in a subwavelength unit cell. Our detector realizes wideband photoresponse approaching the entire responsivity spectrum of the QWIP-single-sized square cavities can utilize only 60% of the possible bandwidth-and external quantum efficiencies of up to 78% at 6.8 mu m. Our highly flexible design scheme enables integration of photodetectors and metasurfaces with arbitrary arrangements of cavities selectively responding to incidence with a specific wavefront. (c) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement