Fang Ling; Renshuai Huang; Qinglong Meng; Weili Li; Bin Zhang;
In general, the terahertz metamaterial filter
based on the complementary structure mainly has the fixed resonant frequency
and asymmetric resonant frequency edges. In this paper, a thermally control
terahertz narrow bandpass filter consisting of a periodic array of
complementary wires embedded with thermosensitive semiconductor indium
antimonide (InSb) has been proposed. Due to the structure of the filter is
relatively simple, it can be more easily fabricated by lithograph technology
compared with traditional terahertz metamaterial filter structure. Furthermore,
its performance has also been analyzed based on the effective medium theory and
the Drude model. The results show that the resonant frequency shifts from
1.16THz to 2.11THz with the increasing of the temperature from 160K to 360K,
and the blueshift of resonance frequency as large as 81% can be implemented.
Meanwhile, the reflectivity at the resonant frequency almost tends to be zero
and the transmissivity spectrum at the resonant frequency exhibits sharp and
symmetric edges. The filter can be applied to THz imaging system, and can
effectively improve the imaging quality as a result of well characteristics of
dynamic tuned filer and relatively simple structure.
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