摘要
太赫兹技术因其在医学成像、深空探索、无线通信、无损检测等领域的应用前景而受到广泛关注。然而,常温条件下对太赫兹辐射进行高灵敏度检测仍然是一个极大的技术挑战。文中利用低热导率的磁性拓扑绝缘体MnBi_(2)Te_(4)与高热导率的石墨烯形成范德华异质结,进而构建了一种异质结结构的太赫兹探测器。室温条件下,在0.04 THz与0.12 THz的频率太赫兹辐射照射下,探测器展现出超快的光电响应速度(16μs)和较高的响应度(0.43 mA/W和4.61 mA/W),同时具备较低的噪声等效功率(2.04 nW/Hz^(1/2)和190.58 pW/Hz^(1/2))。结果表明,基于石墨烯-MnBi_(2)Te_(4)异质结的太赫兹探测器在太赫兹探测领域具有巨大的应用潜力。
Objective Terahertz radiation,which lies between microwaves and infrared in the electromagnetic spectrum combines the penetration ability of microwaves with the high resolution of optical waves.This unique spectra position endows terahertz radiation with enormous potential for applications across various fields such as biomedical imaging,national security surveillance,next-generation wireless communication and non-destructive testing.The terahertz detector is the core component of a terahertz detection system,responsible for transforming terahertz radiation into electrical signals.Existing terahertz detection technologies suffer from high costs,slow response times,dependency on low-temperature conditions and high power consumption.To overcome these challenges,the development of a room-temperature terahertz detector that is highly sensitive,rapidly responsive and energy-efficient has become imperative.The study presented introduces a heterostructure terahertz detector based on a novel topological magnetic insulator,MnBi_(2)Te_(4),and graphene.By exploiting the photothermoelectric effect,the detector achieves high sensitivity,swift response,and low power consumption at room temperature.Methods Ultraviolet lithography was first employed to create electrode structures on an intrinsic silicon substrate (ρ>10 000Ω·cm),followed by the deposition of 10 nm of titanium (Ti) and 50 nm of gold (Au) via electron beam evaporation.After the metal electrodes were fabricated using a lift-off process,graphene and MnBi_(2)Te_(4) flakes were exfoliated by mechanical exfoliation and subsequently transferred onto the metal electrodes in sequence through a dry transfer method.In this design,the metal electrodes functioned both as conduits for electric current and as antennas for the efficient coupling of terahertz waves.When terahertz radiation was incident on the bow-tie antenna,a significant enhancement in the light absorption efficiency within the device channel was observed.For this reason,the geometric parameters of the bow-tie
作者
胡臻智
刘肇国
周桓立
杨宗儒
宋元军
张晓阳
张彤
HU Zhenzhi;LIU Zhaoguo;ZHOU Huanli;YANG Zongru;SONG Yuanjun;ZHANG Xiaoyang;ZHANG Tong(Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology,Ministry of Education,School of Instrument Science and Engineering,Southeast University,Nanjing 210096,China;Joint International Research Laboratory of Information Display and Visualization,School of Electronic Science and Engineering,Southeast University,Nanjing 210096,China;Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology,Southeast University Suzhou Campus,Suzhou 215123,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2024年第7期226-233,共8页
Infrared and Laser Engineering
基金
国家重点研发计划项目(2021YFB2800700)。
关键词
太赫兹探测器
光热电效应
拓扑绝缘体
范德华异质结
terahertz detector
photothermoelectric effect
topological insulator
Van der Waals heterostructure
