Ultrafast modulation of a THz metamaterial/graphene array integrated device Article Swipe

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Abdullah M. Zaman , Yuichi Saito , Yuezhen Lu , Farhan Nur Kholid , Nikita W. Almond , Oliver J. Burton , Jack Alexander-Webber , Stephan Hofmann , Thomas A. Mitchell , J. Griffiths , Harvey E. Beere , D. A. Ritchie , R. V. Mikhaylovskiy , Riccardo Degl’Innocenti ·

YOU? · · 2022 · Open Access · · DOI: https://doi.org/10.1063/5.0104780

We report on the ultrafast modulation of a graphene loaded artificial metasurface realized on a SiO2/Si substrate by near-IR laser pump, detected via terahertz probe at the resonant frequency of ∼0.8 THz. The results have been acquired by setting the Fermi energy of graphene at the Dirac point via electrostatic gating and illuminating the sample with 40 fs pump pulses at different fluences, ranging from 0.9 to 0.018 mJ/cm2. The sub-ps conductivity rising time was attributed to the combined effect of the ultrafast generation of hot carriers in graphene and electron–hole generation in silicon. In correspondence of the resonance, it was possible to clearly distinguish a partial recovery time of ∼2 ps mainly due to carrier-phonon relaxation in graphene, superimposed to the > 1 ns recovery time of silicon. The resonant metasurface yielded ∼6 dB modulation depth in E-field amplitude at 0.8 THz for the range of fluences considered. These measurements set an upper limit for the reconfiguration speed achievable by graphene-based terahertz devices. At the same time, this work represents a great progress toward the realization of an ultrafast THz optoelectronic platform for a plethora of applications, ranging from the investigation of the ultrastrong light-matter regime to the next generation wireless communications.

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Graphene Terahertz radiation Ultrashort pulse Optoelectronics Materials science Amplitude modulation Photonics Fermi energy Laser Metamaterial Silicon Optics Physics Electron Nanotechnology Frequency modulation Radio frequency Computer science Quantum mechanics Telecommunications

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Type: article
Language: en
Landing Page: https://doi.org/10.1063/5.0104780
PDF: https://aip.scitation.org/doi/pdf/10.1063/5.0104780
OA Status: hybrid
Cited By: 10
References: 43
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DOI: https://doi.org/10.1063/5.0104780

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Title: Ultrafast modulation of a THz metamaterial/graphene array integrated device

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Publication year: 2022

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Publication date: 2022-08-29

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Authors: Abdullah M. Zaman, Yuichi Saito, Yuezhen Lu, Farhan Nur Kholid, Nikita W. Almond, Oliver J. Burton, Jack Alexander-Webber, Stephan Hofmann, Thomas A. Mitchell, J. Griffiths, Harvey E. Beere, D. A. Ritchie, R. V. Mikhaylovskiy, Riccardo Degl’Innocenti

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Concepts: Graphene, Terahertz radiation, Ultrashort pulse, Optoelectronics, Materials science, Amplitude modulation, Photonics, Fermi energy, Laser, Metamaterial, Silicon, Optics, Physics, Electron, Nanotechnology, Frequency modulation, Radio frequency, Computer science, Quantum mechanics, Telecommunications

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Cited by: 10

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