Graphene nanoribbon based plasmonic Fresnel zone plate lenses
File(s)
Author(s)
Type
Journal Article
Abstract
A graphene-based metamaterial lens is theoretically proposed by combining plasmonic nanoribbons with Fresnel Zone Plate (FZP) architecture to realize wavelength-selective and tunable lensing. The plasmonic FZP lens shows higher focal intensity and efficiency compared to conventional FZP. As compared with normal graphene FZP, the lensing effect of the plasmonic FZP can be enhanced by 83 times. When compared with Au thin film based FZP lenses, the graphene plasmonic lenses can achieve comparable lensing effects, but with a thinner geometry and with an additional advantage of being wavelength selective and tuneable. The analyses of selectivity and tunability of the plasmonic lens show that the plasmonic lens functions as a filter with broadband incident light or as a switch which can be turned on and off via changing the Fermi levels. The diffraction between neighboring graphene nanoribbons and the effect of the substrate on the lensing effect is also discussed. The plasmonic effect of the nanoribbons only contributes to the focal intensity without affecting the diffraction properties of Fresnel zone plate lenses such as focal lengths. This plasmonic FZP lens is an ideal combination of near and far field optics. However, the complex interaction of diffractions within and between the FZP rings could lead to a significant change of the lensing effect, which opens the possibility of creating innovative graphene metamaterial devices. The findings in this work can be used for developing wavelength-selective electro-optical applications operating in the infrared and terahertz ranges.
Date Issued
2017-03-15
Date Acceptance
2017-03-03
Citation
RSC Advances: an international journal to further the chemical sciences, 2017, 7 (27), pp.16594-16601
ISSN
2046-2069
Publisher
Royal Society of Chemistry
Start Page
16594
End Page
16601
Journal / Book Title
RSC Advances: an international journal to further the chemical sciences
Volume
7
Issue
27
Copyright Statement
© The Royal Society of Chemistry 2017. This article is licensed under aCreative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/)
License URL
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000398673700039&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
CARBON NANOTUBE ARRAYS
INFRARED-SPECTROSCOPY
TERAHERTZ
METAMATERIALS
TECHNOLOGY
Publication Status
Published
Date Publish Online
2017-03-15