基于石墨烯的太赫兹和红外宽频频率可调探测。

Wide-band frequency-tunable terahertz and infrared detection with graphene.

机构信息

Quantum Nano-electronics Research Center, Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan.

出版信息

Nanotechnology. 2013 May 31;24(21):214004. doi: 10.1088/0957-4484/24/21/214004. Epub 2013 Apr 25.

DOI:10.1088/0957-4484/24/21/214004

PMID:23618878

Abstract

We report a graphene-based frequency-selective terahertz (THz) and infrared (IR) detector. The experimental results have demonstrated that the graphene transistor under a magnetic field is capable of detecting THz and IR waves in a very wide band of frequencies (0.76-33 THz) and that the detection frequency is tuned by changing the magnetic field. We have further imaged electric potential distribution in the graphene detector and have observed local step structure associated with impurities. The THz and IR photoconductivity properties of graphene are likely to be sensitive to such potential steps.

摘要

我们报告了一种基于石墨烯的频率选择太赫兹（THz）和红外（IR）探测器。实验结果表明，磁场下的石墨烯晶体管能够在非常宽的频率范围内（0.76-33 THz）检测 THz 和 IR 波，并且通过改变磁场来调谐检测频率。我们进一步对石墨烯探测器中的电势分布进行了成像，并观察到与杂质相关的局部阶跃结构。石墨烯的太赫兹和红外光电导性质可能对这种电势阶跃敏感。