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Tunable and Multichannel Terahertz Perfect Absorber Due to Tamm Plasmons with Topological Insulators |
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| Authors: | Wu Jipeng Liang Yanzhao Guo Jun Jiang Leyong Dai Xiaoyu Xiang Yuanjiang |
| Institution: | 1.College of Traffic Engineering, Hunan University of Technology, Zhuzhou, 412007, China ;2.International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China ;3.Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China ;4.School of Physics and Electronics, Hunan Normal University, Changsha, 410081, China ; |
| Abstract: | In this paper, Tamm plasmons with topological insulators in a composite structure consisting of Bi2Se3, spacer layer, and one-dimensional photonic crystal (1DPC) have been demonstrated theoretically. The perfect absorption has been realized in the terahertz regime because of the optical Tamm states (OTSs) excited at the interface between Bi2Se3 and 1DPC. The perfect absorption can be realized for both TE and TM waves, and it is noted that the perfect absorption can be obtained at any incident angle by simultaneously changing the wavelength of incident light for TE-polarizations. Moreover, the perfect absorption can be realized at different wavelengths with the change of the chemical potential and the thickness of Bi2Se3. The thickness and the dielectric constant of the spacer layer will also play a vital role in the performance of the perfect absorber. Especially, the multichannel perfect absorption phenomenon can be achieved by choosing the appropriate thickness of the spacer layer. This tunable and multichannel terahertz perfect absorber has great application potential in the solar energy, photodetection, and THz biosensor. |
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