Synchronously wired infrared antennas for resonant single-quantum-well photodetection up to room temperature
Synchronously wired infrared antennas for resonant single-quantum-well photodetection up to room temperature
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DOI：
10.1038/s41467-020-14426-6
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发表时间：
2020-01-28
影响因子：
16.6
通讯作者：
Miyazaki, Hiroshi
中科院分区：
文献类型：
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作者：
Miyazaki, Hideki T.;Mano, Takaaki;Miyazaki, Hiroshi
将电介质夹在金属层之间的光学贴片天线已被用作超表面的深亚波长构建块，以实现完美的吸收器和热发射器。然而，对于这些超表面在光电器件中的应用，每个电隔离天线的布线对于偏置和电流是必不可少的。在这里，我们展示了互连天线的几何工程金属线可以起到同步光学相位的作用，以促进相干谐振，而不仅仅是作为电导体。将最佳折叠线连接的天线应用于具有单层4 nm厚量子阱的子带间红外光电探测器中，在78 K下甚至延伸至室温时，偏振无关的外量子效率高达61%（响应度3.3 AW(-1)，峰值波长6.7 μ m）。同步有线天线的应用不仅限于光电探测器，还有望作为发射器和调制器等光电器件的阵列亚波长谐振器的基本架构。
Optical patch antennas sandwiching dielectrics between metal layers have been used as deep subwavelength building blocks of metasurfaces for perfect absorbers and thermal emitters. However, for applications of these metasurfaces for optoelectronic devices, wiring to each electrically isolated antenna is indispensable for biasing and current flow. Here we show that geometrically engineered metallic wires interconnecting the antennas can function to synchronize the optical phases for promoting coherent resonance, not only as electrical conductors. Antennas connected with optimally folded wires are applied to intersubband infrared photodetectors with a single 4-nm-thick quantum well, and a polarization-independent external quantum efficiency as high as 61% (responsivity 3.3 AW(-1), peak wavelength 6.7 mu m) at 78 K, even extending to room temperature, is demonstrated. Applications of synchronously wired antennas are not limited to photodetectors, but are expected to serve as a fundamental architecture of arrayed subwavelength resonators for optoelectronic devices such as emitters and modulators.