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Nanomaterials 2018, 8(3), 175; https://doi.org/10.3390/nano8030175

Plasmonic Absorption Enhancement in Elliptical Graphene Arrays

1
School of Science, Southwest University of Science and Technology, Mianyang 621010, China
2
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China
3
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
4
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
5
College of Physics and Electronics, Central South University, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Received: 2 February 2018 / Revised: 15 March 2018 / Accepted: 15 March 2018 / Published: 19 March 2018
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Abstract

In this paper, we come up with a wavelength tunable absorber which is made up of periodically elliptical graphene arrays in the far-infrared and terahertz regions. Through simulation, we find that we can increase the length of long axis of the ellipse, raise the incidence angles of TM- and TE-polarization (TM- and TE-polarization indicate the direction of the incident electric field along the direction of the x and the y axis, respectively.) within certain limits, and increase the chemical potential of graphene, so as to enhance the absorption of light in the elliptical graphene arrays. We also compare the absorption spectra of the original structure and the complementary structure, and find that the absorption of the original structure is higher than that of the complementary structure. In the end, we study the changes in the absorption rate of the double layer structure of the elliptical array with the increase in the thickness of SiO2. The elliptical array structure can be applied to tunable spectral detectors, filters and sensors at far-infrared and terahertz wavelengths. View Full-Text
Keywords: graphene surface plasmon; metamaterials; absorption enhancement; FDTD method graphene surface plasmon; metamaterials; absorption enhancement; FDTD method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, J.; Zeng, Y.; Xu, X.; Chen, X.; Zhou, Z.; Shi, P.; Yi, Z.; Ye, X.; Xiao, S.; Yi, Y. Plasmonic Absorption Enhancement in Elliptical Graphene Arrays. Nanomaterials 2018, 8, 175.

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