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Nanophotonic Engineering: A New Paradigm for Spectrally Sensitive Thermal Photodetectors
ACS Photonics ( IF 7 ) Pub Date : 2020-12-29 , DOI: 10.1021/acsphotonics.0c01068
Jon W. Stewart 1 , Nathaniel C. Wilson 2 , Maiken H. Mikkelsen 1
Affiliation  

Thermal photodetectors rely on thermally sensitive materials to convert the heat generated from incoming light to an electrical signal and are used in, for example, focal plane arrays and for room-temperature, high-photon-flux applications. However, the theory for thermal detectors was initially developed before nanophotonic engineering and, thus, typically assume the integrated absorbers are blackened or have a flat spectral response. Here we discuss recent developments in nanophotonics and metamaterials that have allowed for the creation of spectrally selective absorbers capable of suppressing undesired thermal emission and increasing the potential sensitivity of thermal photodetectors. Furthermore, the subwavelength features of nanophotonic or metamaterial absorbers decrease the amount of material required for absorption, which reduces the detector’s thermal capacitance while increasing its response time and sensitivity. The ideal thermal and noise dynamics are derived for both spectrally selective and unselective thermal detectors, revealing exciting opportunities for future thermal photodetectors with increased sensitivities and response times and decreased noise floors.

中文翻译:

纳米光子工程:光谱敏感热光电探测器的新范例

热光电探测器依靠热敏材料将入射光产生的热量转换为电信号,并用于例如焦平面阵列和室温高光子通量应用。但是,热探测器的理论最初是在纳米光子工程学之前发展的,因此,通常假定集成的吸收器变黑或具有平坦的光谱响应。在这里,我们讨论了纳米光子学和超材料的最新发展,这些发展已允许创建能够抑制不想要的热发射并增加热光电探测器的潜在灵敏度的光谱选择性吸收剂。此外,纳米光子或超材料吸收体的亚波长特性会减少吸收所需的材料量,这样可以减少检测器的热电容,同时增加其响应时间和灵敏度。为光谱选择性和非选择性热探测器都推导出了理想的热和噪声动态特性,从而为未来的热光电探测器带来了激动人心的机遇,因为它们的灵敏度和响应时间都在增加,本底噪声降低了。
更新日期:2021-01-20
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