光探测
光电子学
等离子体子
材料科学
光电流
极化(电化学)
红外线的
之字形的
光电探测器
光学
表面等离子共振
物理
纳米技术
化学
物理化学
纳米颗粒
数学
几何学
作者
Prabhu K. Venuthurumilli,Peide D. Ye,Xianfan Xu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-04-23
卷期号:12 (5): 4861-4867
被引量:158
标识
DOI:10.1021/acsnano.8b01660
摘要
Black phosphorus, a recently intensely investigated two-dimensional material, is promising for electronic and optoelectronic applications due to its higher mobility and thickness-dependent direct band gap. With its low direct band gap and anisotropic properties in nature, black phosphorus is also suitable for near-infrared polarization-sensitive photodetection. To enhance photoresponsivity of a black phosphorus based photodetector, we demonstrate two designs of plasmonic structures. In the first design, plasmonic bowtie antennas are used to increase the photocurrent, particularly in the armchair direction, where the optical absorption is higher than that in the zigzag direction. The simulated electric field distribution with bowtie structures shows enhanced optical absorption by localized surface plasmons. In the second design, bowtie apertures are used to enhance the inherent polarization selectivity of black phosphorus. A high photocurrent ratio (armchair to zigzag) of 8.7 is obtained. We choose a near-infrared wavelength of 1550 nm to demonstrate the photosensitivity enhancement and polarization selectivity, as it is useful for applications including telecommunication, remote sensing, biological imaging, and infrared polarimetry imaging.
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