Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep08901
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Funding
- National Program o Key Basic Research Project of China (973 Program) [2014CB339806]
- Major National Development Project of Scientific Instrument and Equipment [2011YQ150021, 2012YQ14000504]
- National Natural Science Foundation of China [61138001, 61205094, 61307126, 61377111]
- Key Scientific and Technological Project of Science and Technology Commission of Shanghai Municipality [2014XD140300, 12JC1407100]
- Scientific Research Innovation Project of Shanghai Municipal Education Commission [14YZ093]
- New Century Excellent Talents Project from Ministry of Education [NCET-12-1052]
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Metamaterials, artificial electromagnetic media consisting of periodical subwavelength metal-based micro-structures, were widely suggested for the absorption of terahertz (THz) waves. However, they have been suffered from the absorption of THz waves just in the single-frequency owing to its resonance features. Here, in this paper, we propose a simple periodical structure, composed of two 90 degree crossed dumbbell-shaped doped-silicon grating arrays, to demonstrate broadband THz wave absorption. Our theoretical and experimental results illustrate that THz waves can be efficiently absorbed more than 95% ranging from 0.92 THz to 2.4 THz. Such an ultra-wideband polarization-independent THz absorber is realized mainly based on the mechanisms of the anti-reflection effect together with the [+/- 1, 0]-order and [0, +/- 1]-order grating diffractions. The application of our investigation can be extend to THz couplers, filters, imaging, and so on.
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