Tunable plasmon lensing in graphene-based structure exhibiting negative refraction.

Abstract:

:We propose a novel method to achieve tunable plasmon focusing in graphene/photonic-crystal hybrid structure exhibiting all-angle negative refraction at terahertz frequencies. A two-dimensional photonic crystal composed of a square lattice of dielectric rods is constructed on the substrate of a graphene sheet to provide the hyperbolic dispersion relations of the graphene plasmon, giving rise to the all-angle plasmonic negative refraction. Plasmon lensing induced from the negative refraction is observed. We show that the ultracompact graphene-based system can produce sub-diffraction-limited images with the resolution significant smaller than the wavelength of the incident terahertz wave. Moreover, by adjusting the Fermi energy of the graphene, the imaging performance of the proposed system can remain almost invariant for different frequencies. Our results may find applications in diverse fields such as subwavelength spatial light manipulation, biological imaging, and so forth.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhong S,Lu Y,Li C,Xu H,Shi F,Chen Y

doi

10.1038/srep41788

subject

Has Abstract

pub_date

2017-02-02 00:00:00

pages

41788

issn

2045-2322

pii

srep41788

journal_volume

7

pub_type

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