NDLI: Tunable THz perfect absorber with two absorption peaks based on graphene microribbons

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Tunable THz perfect absorber with two absorption peaks based on graphene microribbons

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The Journal of Engineering

Tunable THz perfect absorber with two absorption peaks based on graphene microribbons

Content Provider	IET Digital Library
Author	Gu, Mingyue Xiao, Binggang Xiao, Sanshui
Abstract	Perfect absorption is characterised by the complete suppression of incident and reflected electromagnetic wave, and complete dissipation of the incident energy. A tunable perfect terahertz (THz) absorber with two absorption peaks based on graphene is presented. The proposed structure consists of graphene microribbons sandwiched between aluminium oxide strips and polymethyl methacrylate slab on a silicon dioxide (SiO2) layer which is covered by periodic gold (Au) ribbons, and the SiO2 layer is supported by the Au substrate. The influence of the structural parameters on the absorption performance was analysed too. Especially, graphene can be used to design tunable THz devices due to its tunability of sheet conductivity which could be controlled by applying a bias voltage or chemical doping. A single-band perfect absorption can be achieved when the chemical potential is set to 0.1 eV. Interestingly, when the chemical potential changed to 0.6 eV, a dual-band absorption spectrum is obtained with absorption efficiency of the two peaks more than 90%. These results imply that the characteristics of graphene-based surface plasmon could be used to design novel THz devices in future.
Starting Page	631
Ending Page	635
Page Count	5
Volume Number	13
e-ISSN	17500443
Issue Number	Issue 5, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/mnl/13/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/mnl.2017.0742
Journal	Micro & Nano Letters
Publisher Date	2018-05-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Absorption Peaks Aluminium Compound Aluminium Oxide Strips Au-Al2O3-C-SiO2 Bias Voltage Chemical Doping Doping Dual-band Absorption Spectrum Electrical Conductivity Electromagnetic Wave Absorption Electromagnetic Wave Propagation Gold Graphene Graphene Microribbons Graphene-based Surface Plasmon Characteristic Incident Electromagnetic Wave Suppression Incident Energy Dissipation Microwave Circuit And Device Microwave MetaMaterial Perfect Absorption Periodic Gold Ribbons Polymer Polymethyl Methacrylate Slab Reflected Electromagnetic Wave Suppression Sheet Conductivity Tunability Silicon Dioxide Layer Single-band Perfect Absorption SiO2 Slabs Surface Plasmon Resonance Terahertz Wave Device Tunable Perfect Terahertz Absorber Tunable THz Device Tunable THz Perfect Absorber
Content Type	Text
Resource Type	Article

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