Graphene Based Terahertz Phase Modulators

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    Electrical control of amplitude and phase of terahertz radiation (THz) is the key technological challenge for high resolution and noninvasive THz imaging. The lack of active materials and devices hinders the realization of these imaging systems. Here, we demonstrate an efficient terahertz phase and amplitude modulation using electrically tunable graphene devices. Our device structure consists of electrolyte-gated graphene placed at quarter wavelength distance from a reflecting metallic surface. In this geometry, graphene operates as a tunable impedance surface which yields electrically controlled reflection phase. Terahertz time domain reflection spectroscopy reveals the voltage controlled phase modulation of π and the reflection modulation of 50 dB. To show the promises of our approach, we demonstrate a multipixel phase modulator array which operates as a gradient impedance surface.

    Original languageEnglish
    Article number035018
    Journal2 D Materials
    Issue number3
    Early online date20 Apr 2018
    Publication statusPublished - 4 May 2018


    • terahertz phase
    • graphene
    • quarter wave surface
    • electrolyte gating
    • tunable surface impedance
    • gradient phase surface

    Research Beacons, Institutes and Platforms

    • National Graphene Institute


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