Abstract-Dual-band tunable perfect metamaterial absorber in the THz range

Gang Yao, Furi Ling, Jin Yue, Chunya Luo, Jie Ji, and Jianquan Yao

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-2-1518

In this paper, a dual-band perfect absorber, composed of a periodically patterned elliptical nanodisk graphene structure and a metal ground plane spaced by a thin SiO2 dielectric layer, is proposed and investigated. Numerical results reveal that the absorption spectrum of the graphene-based structure displays two perfect absorption peaks in the terahertz band, corresponding to the absorption value of 99% at 35𝜇𝑚 and 97%at 59𝜇𝑚, respectively. And the resonance frequency of the absorber can be tunned by controlling the Fermi level of graphene layer. Further more, it is insensitive to the polarization and remains very high over a wide angular range of incidence around ±600. Compared with the previous graphene dual-band perfect absorption, our absorber only has one shape which can greatly simplify the manufacturing process.

© 2016 Optical Society of America

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Abstract-Terahertz active imaging radar: preprocessing and experiment results

Gang Yao and Yiming Pi,

EURASIP Journal on Wireless Communications and Networking 2014, 2014:10  doi:10.1186/1687-1499-2014-10

http://jwcn.eurasipjournals.com/content/2014/1/10/abstract

A terahertz (THz) radar provides the possibility of higher precision imaging due to the wider bandwidth. A summary of a THz imaging radar system is presented with emphasis on THz radar component design, system design, and detective imaging. In this article, we introduce a linear frequency-modulated continuous wave (LFMCW) radar system with a 4.8-GHz bandwidth and theoretical resolution of 3.125 cm. The heterodyne RF receiver structure is applied to the system to reduce the sampling rate. A non-linear correction method is applied to compensate the range backscatter signal. With the presented LFMCW radar system, high-resolution images (3.5 cm ? 3.5 cm) are achieved using the ISAR imaging technique. The experiments performed on the real LFMCW radar data have shown the capability of high-resolution imaging.