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All-optically Control of Light Propagation in Valley-Hall Topological Waveguides of Graphene Metasurfaces

Wang, Y; You, JW; Panoiu, NC; (2021) All-optically Control of Light Propagation in Valley-Hall Topological Waveguides of Graphene Metasurfaces. In: 2021 Fifteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). (pp. pp. 454-456). IEEE: New York, NY, USA. Green open access

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Abstract

We study the influence of graphene Kerr effect on valley-Hall topological modes of a graphene plasmonic crystal waveguide. Extra air holes are introduced to break the spatial-inversion symmetry of the plasmonic metasurface, which can be performed using e-beam lithography. As a result, a gapless Dirac cone and topologically protected edge modes form inside the nontrivial frequency bandgap. Taking advantage of the fact that graphene is a nonlinear optical material possessing an extremely large Kerr coefficient, we demonstrate that an all-optical switch can be implemented in this topological photonic system by controlling an optical signal propagating in the waveguide via a pump beam injected into the bulk modes of the metasurface. This work may lead to new graphene-based active topological photonic nanodevices.

Type: Proceedings paper
Title: All-optically Control of Light Propagation in Valley-Hall Topological Waveguides of Graphene Metasurfaces
Event: 15th International Congress on Artificial Materials for Novel Wave Phenomena - Metamaterials 2021
ISBN-13: 9781728150185
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/Metamaterials52332.2021.9577127
Publisher version: http://dx.doi.org/10.1109/Metamaterials52332.2021....
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Photonic band gap , Optical switches, Graphene, Metasurfaces, Plasmons, Optical pumping, Optical materials
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10139957
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