期刊
NATURE MATERIALS
卷 17, 期 11, 页码 986-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-018-0157-7
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资金
- National Science Foundation (CAREER Award) [ECCS-1552461]
- Office of Naval Research [N00014-14-1-0565]
- Spanish MINECO [MAT2017-88492-R, SEV2015-0522]
- European Commission (Graphene Flagship) [696656]
- Fundacio Privada Cellex
Optical excitation and subsequent decay of graphene plasmons can produce a significant increase in charge-carrier temperature. An efficient method to convert this temperature elevation into electrical signals can enable important mid-infrared applications. However, the modest thermoelectric coefficient and weak temperature dependence of carrier transport in graphene hinder this goal. Here, we demonstrate mid-infrared graphene detectors consisting of arrays of plasmonic resonators interconnected by quasi-one-dimensional nanoribbons. Localized barriers associated with disorder in the nanoribbons produce a dramatic temperature dependence of carrier transport, thus enabling the electrical detection of plasmon decay in the nearby graphene resonators. Our device has a subwavelength footprint of 5 x 5 mu m(2) and operates at 12.2 mu m with an external responsivity of 16 mA W-1 and a low noise-equivalent power of 1.3 nW Hz(-1/2) at room temperature. It is fabricated using large-scale graphene and possesses a simple two-terminal geometry, representing an essential step towards the realization of an on-chip graphene mid-infrared detector array.
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