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Open AccessArticle

Ultra-Broadband Absorption from 750.0 nm to 5351.6 nm in a Novel Grating Based on SiO2-Fe-Sandwich Substrate

1
College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China
2
Bureau of Meteorology of Guangdong Province, Guangzhou 510530, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(12), 1892; https://doi.org/10.3390/ma12121892
Received: 16 April 2019 / Revised: 27 May 2019 / Accepted: 5 June 2019 / Published: 12 June 2019
In this paper, we design a three-part-period grating based on alternating Fe/SiO 2 sandwich structure, which can achieve an ultra-broadband absorption from 750.0 nm to 5351.6 nm. In particular, the absorbing efficiency can reach to more than 95% within 2158.8 nm, which is due to the well impedance matching of Fe with the free space, as well as due to the excitation of localized surface plasmon resonance and surface propagation plasmon resonance in the proposed structure. Furthermore, multiple period gratings are also discussed to broaden the absorption band. These results are very promising for applications in high-performance photovoltaics, nonlinear optics devices and protective equipment for laser weapons. View Full-Text
Keywords: filling factor; grating; surface plasmon; ultra-broadband absorption filling factor; grating; surface plasmon; ultra-broadband absorption
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MDPI and ACS Style

Wu, Z.; Liu, H.; Yang, H.; Liu, J.; Liu, P. Ultra-Broadband Absorption from 750.0 nm to 5351.6 nm in a Novel Grating Based on SiO2-Fe-Sandwich Substrate. Materials 2019, 12, 1892.

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