Absorption enhancement and total absorption in a graphene-waveguide hybrid structure
TLDR
In this article, the authors proposed a graphene/planar waveguide hybrid structure, and demonstrated total absorption in the visible wavelength range by means of attenuated total reflectance, and achieved broadband absorption enhancement in near-IR range by cascading multiple graphene-waveguide hybrid structures.Abstract:
We propose a graphene/planar waveguide hybrid structure, and demonstrate total absorption in the visible wavelength range by means of attenuated total reflectance. The excitation of planar waveguide mode, which has strong near field enhancement and increased light interaction length with graphene, plays a vital role in total absorption. We analyze the origin and physical insight of total absorption theoretically by using an approximated reflectance, and show how to design such hybrid structure numerically. Utilizing the tunability of doped graphene, we discuss the possible application in optical modulators. We also achieve broadband absorption enhancement in near-IR range by cascading multiple graphene-waveguide hybrid structures. We believe our results will be useful not only for potential applications in optical devices, but also for studying other two-dimension materials.read more
Citations
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Investigation of multiband plasmonic metamaterial perfect absorbers based on graphene ribbons by the phase-coupled method
TL;DR: In this paper, a phase-coupled method was developed to realize multispectral near-unity absorbers based on spatially separated graphene ribbon arrays with mid-infrared plasmonic resonances.
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Tunable ultra-wideband terahertz absorber based on graphene disks and ribbons
Sadegh Biabanifard,Mohammad Biabanifard,Somayyeh Asgari,Shahrouz Asadi,Mustapha C. E. Yagoub +4 more
TL;DR: In this paper, a novel ultra-wideband terahertz absorber by using periodic arrays of graphene disks and ribbons is proposed and analyzed using analytical expressions for the input impedance of the proposed structure.
Journal ArticleDOI
Multi-channel perfect absorber based on a one-dimensional topological photonic crystal heterostructure with graphene.
TL;DR: It is found that a huge absorption enhancement appears because of the excitation of topological edge mode, while the graphene is sandwiched between two 1D PhCs, and the single peak perfect absorption can be maintained more than 97% with the incident angle varying from 0° to 50°.
Journal ArticleDOI
Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials.
Bo Liu,Chaojun Tang,Jing Chen,Jing Chen,Jing Chen,Ningyan Xie,Huang Tang,Zhu Xiaoqin,Gun-Sik Park +8 more
TL;DR: This work numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials.
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Monolayer-graphene-based broadband and wide-angle perfect absorption structures in the near infrared.
TL;DR: Broadband optical absorption structures in the near infrared by coupling monolayer-graphene with periodical metal structures are proposed and demonstrated numerically and show angular-insensitive absorption for oblique incidence in a large angular range.
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