Monolayer Graphene Terahertz Detector Integrated with Artificial Microstructure
Mengjie Jiang,
Kaixuan Zhang,
Xuyang Lv,
Lin Wang,
Libo Zhang,
Li Han,
Huaizhong Xing
Affiliations
Mengjie Jiang
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Department of Optoelectronic Science and Engineering, Donghua University, Shanghai 201620, China
Kaixuan Zhang
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Department of Optoelectronic Science and Engineering, Donghua University, Shanghai 201620, China
Xuyang Lv
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Department of Optoelectronic Science and Engineering, Donghua University, Shanghai 201620, China
Lin Wang
State Key Laboratory for Infrared, Physics Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu-tian Road, Shanghai 200083, China
Libo Zhang
State Key Laboratory for Infrared, Physics Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu-tian Road, Shanghai 200083, China
Li Han
State Key Laboratory for Infrared, Physics Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu-tian Road, Shanghai 200083, China
Huaizhong Xing
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Department of Optoelectronic Science and Engineering, Donghua University, Shanghai 201620, China
Graphene, known for its high carrier mobility and broad spectral response range, has proven to be a promising material in photodetection applications. However, its high dark current has limited its application as a high-sensitivity photodetector at room temperature, particularly for the detection of low-energy photons. Our research proposes a new approach for overcoming this challenge by designing lattice antennas with an asymmetric structure for use in combination with high-quality monolayers of graphene. This configuration is capable of sensitive detection of low-energy photons. The results show that the graphene terahertz detector-based microstructure antenna has a responsivity of 29 V·W−1 at 0.12 THz, a fast response time of 7 μs, and a noise equivalent power of less than 8.5 pW/Hz1/2. These results provide a new strategy for the development of graphene array-based room-temperature terahertz photodetectors.
