Geometrical tradeoffs in graphene-based deeply-scaled electrically reconfigurable metasurfaces

Scientific Reports
Sara Arezoomandan, Berardi Sensale-Rodriguez

Abstract

In this work we study the terahertz light propagation through deeply-scaled graphene-based reconfigurable metasurfaces, i.e. metasurfaces with unit-cell dimensions much smaller than the terahertz wavelength. These metasurfaces are analyzed as phase modulators for constructing reconfigurable phase gradients along an optical interface for the purpose of beam shaping. Two types of deeply-scaled metacell geometries are analyzed and compared, which consist of: (i) multi split ring resonators, and (ii) multi spiral resonators. Two figures of merit, related to: (a) the loss and (b) the degree of reconfigurability achievable by such metamaterials -when applied in beam shaping applications-, are introduced and discussed. Simulations of these two types of deep-subwavelength geometries, when changing the metal coverage-fraction, show that there is an optimal coverage-fraction that gives the best tradeoff in terms of loss versus degree of reconfigurability. For both types of geometries the best tradeoff occurs when the area covered by the metallic region is around 40% of the metacell total area. From this point of view, reconfigurable deeply-scaled metamaterials can indeed provide a superior performance for beam shaping applications when c...Continue Reading

References

Dec 1, 2006·Nature·Hou-Tong ChenRichard D Averitt
Sep 6, 2011·Nature Nanotechnology·Long JuFeng Wang
Feb 16, 2012·Nano Letters·Ming LiuXiang Zhang
Apr 19, 2012·Nature Communications·Berardi Sensale-RodriguezHuili Grace Xing
Oct 2, 2012·Nature Materials·Seung Hoon LeeBumki Min
Dec 25, 2012·Optics Express·Rusen YanHuili Grace Xing

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Citations

May 20, 2016·Scientific Reports·Muhammad Tayyab NoumanJae-Hyung Jang

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