硫族化物超表面实现从可见光到中红外的超宽带探测器
Chalcogenide Metasurfaces Enabling Ultra-Wideband Detectors from Visible to Mid-infrared
AI总结：
该研究设计并制备Sb2Te3硫族化物超表面，利用可见光带间等离激元与中红外Mie共振及热电效应，实现从可见光到中红外的偏振选择性超宽带探测。
摘要：
热电材料可被设计为支持跨多个光谱范围的光学共振，从而实现超宽带光电探测。例如，碲化锑（Sb2Te3）硫族化物在可见光范围表现出带间等离激元共振，并在中红外（mid-IR）范围表现出米氏（Mie）共振，同时具有较大的热电塞贝克系数。本文中，我们设计并制备了Sb2Te3超表面器件，以实现共振吸收，从而使光电探测器能够在从可见光到中红外的超宽光谱范围内工作。此外，依托非对称Sb2Te3超表面，我们展示了具有偏振选择性的热电光电探测器。这项工作为面向环境传感应用的室温便携式超宽带光谱仪提供了潜在平台。
英文摘要：
Thermoelectric materials can be designed to support optical resonances across multiple spectral ranges to enable ultra-wide band photodetection. For instance, antimony telluride (Sb2Te3) chalcogenide exhibits interband plasmonic resonances in the visible range and Mie resonances in the mid-infrared (mid-IR) range, while simultaneously possessing large thermoelectric Seebeck coefficients. In this paper, we designed and fabricated Sb2Te3 metasurface devices to achieve resonant absorption for enabling photodetectors operating across an ultra-wideband spectrum, from visible to mid-IR. Furthermore, relying on asymmetric Sb2Te3 metasurface, we demonstrated the thermoelectric photodetectors with polarization-selectivity. This work provides a potential platform towards the portable ultrawide band spectrometers at room temperature, for environmental sensing applications.
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