• 文献标题:   Metamaterial grating-integrated graphene photodetector with broadband high responsivity
  • 文献类型:   Article
  • 作  者:   LI JF, ZHAO C, LIU BY, YOU CY, CHU FH, TIAN N, CHEN YF, LI SY, AN BX, CUI AJ, ZHANG XP, YAN H, LIU DM, ZHANG YZ
  • 作者关键词:   metamaterial, graphene, photodetector, photoresponsivity
  • 出版物名称:   APPLIED SURFACE SCIENCE
  • ISSN:   0169-4332 EI 1873-5584
  • 通讯作者地址:   Beijing Univ Technol
  • 被引频次:   7
  • DOI:   10.1016/j.apsusc.2018.12.194
  • 出版年:   2019

▎ 摘  要

Graphene has some outstanding properties in the photoelectric field, especially ultra fast response and broad spectrum absorption, which have led to strong attraction on graphene photodetector. However, the photoresponsivity of pure graphene device is below 10 mA W-1. It would limit the application of graphene photodetector. Here, we design a metamaterial structure with a broadband high absorption spectrum. And by integrating it into the graphene photodetector, the high photoresponsivity of a pure graphene photodetector in a broadband range could be acquired. The photoresponsivity of photodetector can achieve nearly 200 mA W(-1)which is two orders higher than the one of pure monolayer graphene photodetector. Besides, the photodetector also keeps the broadband photoresponse. The hot carriers can be generated by coupling of multiple resonances and effectively transported to graphene with the advantage of ultrathin metal film. Based on this work, more potential applications of graphene photodetector could be developed in some related fields.