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    Rights statement: This is the peer reviewed version of the following article: S. J. Kindness, N. W. Almond, B. Wei, R. Wallis, W. Michailow, V. S. Kamboj, P. Braeuninger‐Weimer, S. Hofmann, H. E. Beere, D. A. Ritchie, R. Degl'Innocenti, Advanced Optical Materials 2018, 6, 1800570. https://doi.org/10.1002/adom.201800570 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002./adom.201800570/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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Active Control of Electromagnetically Induced Transparency in a Terahertz Metamaterial Array with Graphene for Continuous Resonance Frequency Tuning

Research output: Contribution to journalJournal article

Published
  • Stephen Kindness
  • Nikita Almond
  • Binbin Wei
  • Robert Wallis
  • Wladislaw Michailow
  • Varun S. Kamboj
  • Philipp Braeuninger-Weimer
  • Stephan Hofmann
  • Harvey E. Beere
  • D. A. Ritchie
  • Riccardo Degl'Innocenti
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<mark>Journal publication date</mark>5/11/2018
<mark>Journal</mark>Advanced Optical Materials
Issue number21
Volume6
Publication statusPublished
Early online date26/08/18
Original languageEnglish

Abstract

Optoelectronic terahertz modulators, operated by actively tuning metamaterial, plasmonic resonator structures, have helped to unlock a myriad of terahertz applications, ranging from spectroscopy and imaging to communications. At the same time, due to the inherently versatile dispersion properties of metamaterials, they offer unique platforms for studying intriguing phenomena such as negative refractive index and slow light.
Active resonance frequency tuning of a metamaterial working in the terahertz regime is achieved by integrating metal-coupled resonator arrays with electrically tunable graphene. This metamaterial device exploits coupled plasmonic resonators to exhibit an electromagnetically induced transparency analog, resulting in the splitting of the resonance into coupled hybrid optical
modes. By variably dampening one of the resonators using graphene, the coupling condition is electrically modulated and continuous tuning of the metamaterial resonance frequency is achieved. This device, operating at room temperature, can readily be implemented as a fast, optoelectronic, tunable band pass/reject filter with a tuning range of ≈100 GHz operating at 1.5 THz.
The reconfigurable dispersion properties of this device can also be implemented for modulation of the group delay for slow light applications.

Bibliographic note

This is the peer reviewed version of the following article:S. J. Kindness, N. W. Almond, B. Wei, R. Wallis, W. Michailow, V. S. Kamboj, P. Braeuninger‐Weimer, S. Hofmann, H. E. Beere, D. A. Ritchie, R. Degl'Innocenti, Advanced Optical Materials 2018, 6, 1800570. https://doi.org/10.1002/adom.201800570 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002./adom.201800570/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.