Graphene Based Terahertz Phase Modulators

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 an active materials and devices hinders the realization of these imaging systems. Here, we demonstrate an efficient terahertz phase a...

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Bibliographic Details
Published inarXiv.org
Main Authors Kakenov, Nurbek, M Said Ergoktas, Balci, Osman, Kocabas, Coskun
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 23.04.2018
Subjects
Amplitude modulation
Amplitudes
Graphene
Image resolution
Impedance
Modulators
Phase modulation
Physics - Materials Science
Reflection
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Summary: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 an 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 {\pi} 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1804.08279