hBN-Encapsulated Graphene Coupled to a Plasmonic Metasurface via 1D Electrodes for Photodetection Applications

Christian Frydendahl, Sita Rama Krishna Chaitanya Indukuri, Taget Raghavendran Devidas, Zhengli Han, Noa Mazurski, Kenji Watanabe, Takashi Taniguchi, Hadar Steinberg, Uriel Levy

Research output: Contribution to journalArticlepeer-review


It is shown here how encapsulated graphene devices can be laterally coupled to plasmonic metasurfaces via 1D edge contacts, preserving the high mobility of encapsulated graphene while enhancing optical coupling. The device is used for photodetection applications where high responsivities in the range of 100 A W-1 for most of the visible spectrum are reported. The device exhibits a photogating effect which is attributed to defect states in the encapsulating hBN layers. The results highlight a new configuration to couple graphene with plasmonic structures and points to a new type of device based on defect states and graphene's excellent transport properties to achieve photodetectors with ultrahigh responsivities. Achieving charge transfer from plasmonic decay into graphene requires contact between the plasmonic resonator and the graphene. Previously, it has not been possible to achieve this for graphene sheets encapsulated in the insulator hexagonal boron nitride, but here it is shown how plasmonic cavities that pierce through the encapsulation can be coupled to graphene via 1D electrical contacts.image (c) 2024 WILEY-VCH GmbH
Original languageEnglish
StatePublished - 1 Aug 2024


  • grapehene
  • hBN defects
  • hot carriers
  • photodetections
  • plasmonics


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