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Tunable and dual-broadband giant enhancement of second-harmonic and third-harmonic generation in an optimized graphene-insulator-graphene metasurface

You, JW; Panoiu, NC; (2020) Tunable and dual-broadband giant enhancement of second-harmonic and third-harmonic generation in an optimized graphene-insulator-graphene metasurface. Physical Review B , 102 (12) , Article 121403(R). 10.1103/physrevb.102.121403. Green open access

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Abstract

We demonstrate a scheme to dramatically enhance both the second- and third-harmonic generation (SHG, THG) in a graphene-insulator-graphene metasurface. The key underlying feature of our approach is the existence of a double-resonance phenomenon, namely, the metasurface is designed to possess fundamental plasmon resonances at both the fundamental frequency and the higher harmonic. This dual resonant field enhancement, combined with a favorable spatial overlap of the optical near fields, lead to the increase of the THG and SHG by ∼ 10 9 and ∼ 10 6 , respectively. We also demonstrate that by tuning the Fermi energy of the graphene gratings the dual-resonance property can be locked in over a remarkably broad spectral range of ∼ 20 THz , which is more than three orders of magnitude larger than the spectral tunability achievable in metal-based plasmonic systems. Importantly, the enhanced nonlinear frequency generation process can be readily switched in the same system between the second and third harmonic. This type of graphene metasurface could open up new avenues towards the development of novel ultracompact and multifrequency active photonic nanodevices.

Type: Article
Title: Tunable and dual-broadband giant enhancement of second-harmonic and third-harmonic generation in an optimized graphene-insulator-graphene metasurface
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/physrevb.102.121403
Publisher version: https://doi.org/10.1103/physrevb.102.121403
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Nanoantennas, Nanophotonics, Nonlinear optics, Plasmonics, Surface plasmons, Graphene, Insulators
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/10110083
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