Graphene based plasmonic terahertz amplitude modulator operating above 100 MHz

Jessop, David S. and Kindness, Stephen J. and Xiao, Lei and Braeuninger-Weimer, Philipp and Lin, Hungyen and Ren, Yuan and Ren, C.X. and Hofmann, Stephan and Zeitler, J. Axel and Beere, Harvey E. and Ritchie, D. A. and Degl'innocenti, Riccardo (2016) Graphene based plasmonic terahertz amplitude modulator operating above 100 MHz. Applied Physics Letters, 108 (17). ISSN 0003-6951

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The terahertz (THz) region of the electromagnetic spectrum holds great potential in many fields of study, from spectroscopy to biomedical imaging, remote gas sensing, and high speed communication. To fully exploit this potential, fast optoelectronic devices such as amplitude and phase modulators must be developed. In this work, we present a room temperature external THz amplitude modulator based on plasmonic bow-tie antenna arrays with graphene. By applying a modulating bias to a back gate electrode, the conductivity of graphene is changed, which modifies the reflection characteristics of the incoming THz radiation. The broadband response of the device was characterized by using THz time-domain spectroscopy, and the modulation characteristics such as the modulation depth and cut-off frequency were investigated with a 2.0 THz single frequency emission quantum cascade laser. An optical modulation cut-off frequency of 105 6 15 MHz is reported. The results agree well with a lumped element circuit model developed to describe the device.

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Journal Article
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Applied Physics Letters
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C 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (
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27 Apr 2016 08:14
Last Modified:
17 Sep 2023 01:50