Enhanced Graphene Photodetector with Fractal Metasurface

Jieran Fang, Di Wang, Clayton T DeVault, Ting-Fung Chung, Yong P Chen, Alexandra Boltasseva, Vladimir M Shalaev, Alexander V Kildishev

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Graphene has been demonstrated to be a promising photodetection material because of its ultrabroadband optical absorption, compatibility with CMOS technology, and dynamic tunability in optical and electrical properties. However, being a single atomic layer thick, graphene has intrinsically small optical absorption, which hinders its incorporation with modern photodetecting systems. In this work, we propose a gold snowflake-like fractal metasurface design to realize broadband and polarization-insensitive plasmonic enhancement in graphene photodetector. We experimentally obtain an enhanced photovoltage from the fractal metasurface that is an order of magnitude greater than that generated at a plain gold-graphene edge and such an enhancement in the photovoltage sustains over the entire visible spectrum. We also observed a relatively constant photoresponse with respect to polarization angles of incident light, as a result of the combination of two orthogonally oriented concentric hexagonal fractal geometries in one metasurface.
    Original languageEnglish
    JournalNano Letters
    Volume17
    Issue number1
    Pages (from-to)57–62
    Number of pages6
    ISSN1530-6984
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Photodetector
    • fractal metasurface
    • graphene
    • plasmonics

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