Tunable Plasmonic Perfect Absorber Based on a Multilayer Graphene Strip-Grating Structure

Abstract A near-perfect absorber for the visible regime based on metal-dielectric-metal subwavelength grating structure with the refractory metals is designed and demonstrated numerically. The absorber presents an average absorption over 98.4% in the visible regime at normal incidence. Angle-relative analysis shows that the proposed structure has good angle-tolerance. The high average absorption (86.6%) in the visible region can be maintained with the incident angles up to 60°. Through the analysis of the magnetic field, the physical origin is verified that this excellent absorption performance mainly stems from the cooperative effect of surface plasmonic resonances and the intrinsic broadband spectral responses by the refractory metals. In addition, the dependence of the absorption spectrum of the proposed absorber on the structural parameters is analyzed. This work provides an idea for the design of high-performance absorbers and has potential applications in advanced light energy capture and integration systems.

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Wide-angle infrared plasmonic perfect absorber based on graphene-silica grating

Optica Applicata ◽

10.37190/oa210107 ◽

2021 ◽

Vol 51 (1) ◽

Author(s):

Fang Chen

Keyword(s):

Chemical Potential ◽

Dual Band ◽

Infrared Range ◽

Perfect Absorber ◽

Spectral Position ◽

Wide Angle ◽

Perfect Absorption ◽

Layer Graphene ◽

Wide Range ◽

Graphene Strip

In this paper, wide-angle infrared perfect absorption has been demonstrated by using a double-layer graphene strip grating coupled with a silicon dioxide grating. Numerical simulation of the finite-difference time-domain method indicates that the perfect absorption can be achieved due to the effective impedance matching, and all the incident electromagnetic energy is confined in the Al2O3 layer between the silver substrate and the graphene strip grating. Dual-band perfect absorption is achieved with the change of strip width or chemical potential of the bi-layer graphene strip grating. It is found that the spectral position of the absorption peak can be tuned by the chemical potential or the width of the graphene strip, and additionally by the size of the proposed absorber. Moreover, the proposed perfect absorber shows excellent absorption stability for a wide range of the incident angle up to ±65°. The proposed absorber may find potential application in tunable double band perfect absorbers in the mid-infrared range.

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Diffraction of the H-polarized plane wave by a finite layered graphene strip grating

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078718001290 ◽

2018 ◽

Vol 11 (4) ◽

pp. 326-333 ◽

Cited By ~ 12

Author(s):

Mstislav E. Kaliberda ◽

Leonid M. Lytvynenko ◽

Sergey A. Pogarsky ◽

Mariia P. Roiuk

Keyword(s):

Electromagnetic Wave ◽

Plane Wave ◽

Plane Electromagnetic Wave ◽

Single Layer ◽

Multilayer Graphene ◽

Operator Form ◽

Scattering Operators ◽

Diffraction Patterns ◽

Graphene Strip ◽

Absorption Characteristics

AbstractThe scattering of the H-polarized plane electromagnetic wave by a finite multilayer graphene strip grating is considered. The properties of the whole structure are obtained from the set of integral equations, which are written in the operator form. The scattering operators of a single layer are used and supposed to be known. Scattering and absorption characteristics as well as diffraction patterns are presented.

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