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

Kindness, Stephen and Almond, Nikita and Wei, Binbin and Wallis, Robert and Michailow, Wladislaw and Kamboj, Varun S. and Braeuninger-Weimer, Philipp and Hofmann, Stephan and Beere, Harvey E. and Ritchie, D. A. and Degl'Innocenti, Riccardo (2018) Active Control of Electromagnetically Induced Transparency in a Terahertz Metamaterial Array with Graphene for Continuous Resonance Frequency Tuning. Advanced Optical Materials, 6 (21). ISSN 2195-1071

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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.

Item Type:
Journal Article
Journal or Publication Title:
Advanced Optical Materials
Additional Information:
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.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
127521
Deposited By:
Deposited On:
14 Sep 2018 14:10
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Sep 2020 04:25