Comparison of back and top gating schemes with tunable graphene fractal metasurfaces

Date
2016
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Source Title
ACS Photonics
Print ISSN
2330-4022
Electronic ISSN
Publisher
American Chemical Society
Volume
3
Issue
12
Pages
2303 - 2307
Language
English
Type
Article
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Abstract

In this work, fractal metasurfaces that consist of periodic gold squares on graphene are used to increase light-graphene interaction. We show by simulations and experiments that higher level fractal structures result in higher spectral tunability of resonance wavelength. This is explained by higher field localization for higher level fractal structures. Furthermore, spectral tunability of fractal metasurfaces integrated with graphene is investigated comparing two different schemes for electrostatic gating. Experiment results show that a top-gated device yields more spectral tunability (8% of resonance wavelength) while requiring much smaller gate voltages compared to the back-gated device. © 2016 American Chemical Society.

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Keywords
Fractal metasurfaces, Graphene, Plasmonics, Spectral tunability
Citation
Published Version (Please cite this version)