Monolayer Graphene Terahertz Detector Integrated with Artificial Microstructure

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 center dot W-1 at 0.12 THz, a fast response time of 7 mu s, and a noise equivalent power of less than 8.5 pW/Hz(1/2). These results provide a new strategy for the development of graphene array-based room-temperature terahertz photodetectors.

Automated summary

Graphene, a promising material in photodetection applications, is limited by its high dark current for sensitive detection of low-energy photons at room temperature. Our research proposes a new approach by designing lattice antennas with an asymmetric structure combined with high-quality monolayers of graphene, enabling sensitive detection of low-energy photons. The results show that the graphene terahertz detector-based microstructure antenna has a high responsivity, fast response time, and low noise equivalent power, providing a new strategy for the development of room-temperature terahertz photodetectors based on graphene arrays.