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A simple design of ultra-broadband and polarization insensitive terahertz metamaterial absorber

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Abstract

Ultra-broadband metamaterial absorbers have attracted considerable attention due to their great prospect for practical applications. These absorbers are usually stacked by many (no. <20) different shaped or sized subunits in a unit cell, making it quite troublesome to be fabricated. Simple design for ultra-broadband absorber is urgently necessary. Herein, we propose a simple design of ultra-broadband and polarization insensitive terahertz metamaterial absorber based on a double-layered composite structure on a metallic board, and each layer consists of two sets of different sized square metallic plates. Greater than 90 % absorption is obtained across a frequency range of 0.85 THz with the central frequency around 1.60 THz. The relative absorption bandwidth of the device is greatly improved to 53.3 %, which is much larger than previous results. The mechanism of the ultra-broadband absorber is attributed to the overlapping of four closely resonance frequencies. The proposed metamaterial absorber has potential applications in detection, imaging and stealth technology.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11074069, 61176116), the Hunan Provincial Natural Science Foundation of China (Grant No. 12JJ3009), and the 2013 Graduate Science and Technology Innovation Program of Hunan Province (Grant No. 521298927).

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Authors and Affiliations

  1. School of physics and Microelectronic and Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Hunan University, Changsha, 410082, China

    Ben-Xin Wang, Ling-Ling Wang, Gui-Zhen Wang, Wei-Qing Huang, Xiao-Fei Li & Xiang Zhai

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  1. Ben-Xin Wang
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  2. Ling-Ling Wang
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  3. Gui-Zhen Wang
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  4. Wei-Qing Huang
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Correspondence to Ben-Xin Wang.

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Wang, BX., Wang, LL., Wang, GZ. et al. A simple design of ultra-broadband and polarization insensitive terahertz metamaterial absorber. Appl. Phys. A 115, 1187–1192 (2014). https://doi.org/10.1007/s00339-013-8158-5

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  • DOI: https://doi.org/10.1007/s00339-013-8158-5

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