期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 115, 期 4, 页码 1187-1192出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-013-8158-5
关键词
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资金
- National Natural Science Foundation of China [11074069, 61176116]
- Hunan Provincial Natural Science Foundation of China [12JJ3009]
- Graduate Science and Technology Innovation Program of Hunan Province [521298927]
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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