太赫兹辐射
光电子学
材料科学
响应度
光电探测器
探测器
表面等离子体激元
噪声等效功率
Weyl半金属
等离子体子
表面等离子体子
光学
半金属
物理
硅
作者
Qi Song,Zhiwen Zhou,Gangyi Zhu,Huawei Liang,Min Zhang,Bingyuan Zhang,Fang Liu,Peiguang Yan
出处
期刊:Nanophotonics
[De Gruyter]
日期:2022-07-20
卷期号:11 (16): 3595-3602
被引量:14
标识
DOI:10.1515/nanoph-2022-0227
摘要
Abstract High-performance terahertz wave detectors at room temperature are still urgently required for a wide range of applications. The available technologies, however, are plagued by low sensitivity, narrow spectral bandwidth, complicated structure, and high noise equivalent power (NEP). Here, we have demonstrated a Weyl semimetal surface plasmon-enhanced high-performance terahertz wave detectors which are based on microdisk array deposited WTe 2 nanofilm epitaxially grown on GaN substrate for room temperature operation. With the microdisk array combined the WTe 2 layer, strong terahertz wave surface plasmon polaritons can be generated at the WTe 2 –air interfaces, which results in significant improvement in detecting performance. For the 40 μm diameter microdisk array, a detectivity ( D * ) of 5.52 × 10 12 cm Hz 1/2 pW −1 at 0.1 THz is achieved at room temperature. In addition, the responsivity ( R A ) of 8.78 A W −1 is also obtained. Such high-performance millimeter and terahertz wave photodetectors are useful for wide applications such as high capacity communications, walk-through security, biological diagnosis, spectroscopy, and remote sensing.
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