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Graphene plasmonic nanoresonators/graphene heterostructures for efficient room-temperature infrared photodetection
Journal of Semiconductors  (IF),  Pub Date : 2020-07-01, DOI: 10.1088/1674-4926/41/7/072907
Tian Sun, Weiliang Ma, Donghua Liu, Xiaozhi Bao, Babar Shabbir, Jian Yuan, Shaojuan Li, Dacheng Wei, Qiaoliang Bao

High-performance infrared (IR) photodetectors made by low dimensional materials promise a wide range of applications in communication, security and biomedicine. Moreover, light-harvesting effects based on novel plasmonic materials and their combinations with two-dimensional (2D) materials have raised tremendous interest in recent years, as they may potentially help the device complement or surpass currently commercialized IR photodetectors. Graphene is a particularly attractive plasmonic material because graphene plasmons are electrically tunable with a high degree of electromagnetic confinement in the mid-infrared (mid-IR) to terahertz regime and the field concentration can be further enhanced by forming nanostructures. Here, we report an efficient mid-IR room-temperature photodetector enhanced by plasmonic effect in graphene nanoresonators (GNRs)/graphene heterostructure. The plasmon polaritons in GNRs are size-dependent with strong field localization. Considering that the size and density of GNRs are controllable by chemical vapor deposition method, our work opens a cost-effective and scalable pathway to fabricate efficient IR optoelectronic devices with wavelength tunability.