摘要
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(2 D)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.
基金
support from the National Key Research&Development Program(No.2016YFA0201902,2018YFA0703200)
Shenzhen Nanshan District Pilotage Team Program(LHTD20170006)
National Natural Science Foundation of China(61974099 and 61604102,51773041,61890940)
Shanghai Committee of Science and Technology in China(18ZR1404900)
Natural Science Research Project for Anhui Universities(Grant No.KJ2019A0596)
Youth Project of Provincial Natural Science Foundation of Anhui(Grant No.2008085QF319)
Australian Research Council(ARC,FT150100450 and IH150100006)。
