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Open AccessArticle

Dual-Band Perfect Metamaterial Absorber Based on an Asymmetric H-Shaped Structure for Terahertz Waves

1
Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
2
School of Physical Science and Information Engineering, Liaocheng University, Liaocheng 252059, China
3
Department of Applied Physics, Huzhou University, Huzhou 313000, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(11), 2193; https://doi.org/10.3390/ma11112193
Received: 1 October 2018 / Revised: 26 October 2018 / Accepted: 2 November 2018 / Published: 6 November 2018
(This article belongs to the Section Advanced Nanomaterials)
We designed an ultra-thin dual-band metamaterial absorber by adjusting the side strips’ length of an H-shaped unit cell in the opposite direction to break the structural symmetry. The dual absorption peaks approximately 99.95% and 99.91% near the central resonance frequency of 4.72 THz and 5.0 THz were obtained, respectively. Meanwhile, a plasmon-induced transmission (PIT) like reflection window appears between the two absorption frequencies. In addition to theoretical explanations qualitatively, a multi-reflection interference theory is also investigated to prove the simulation results quantitatively. This work provides a way to obtain perfect dual-band absorption through an asymmetric metamaterial structure, and it may achieve potential applications in a variety of fields including filters, sensors, and some other functional metamaterial devices. View Full-Text
Keywords: metamaterial absorber; H-shaped structure; asymmetry; multi-reflection interference metamaterial absorber; H-shaped structure; asymmetry; multi-reflection interference
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MDPI and ACS Style

Lu, T.; Zhang, D.; Qiu, P.; Lian, J.; Jing, M.; Yu, B.; Wen, J.; Zhuang, S. Dual-Band Perfect Metamaterial Absorber Based on an Asymmetric H-Shaped Structure for Terahertz Waves. Materials 2018, 11, 2193.

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