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Metamaterials4, which are artificially structured material, consists of subwavelength metallic resonators within or onto a dielectric or semiconducting substrate. Research and applications5,6 show that they already exhibit attractive electromagnetic properties, which are not available in naturally materials. Therefore, they can be used to enhance the optoelectronic response ability so as to efficiently manipulate, control, and detect electromagnetic radiation by particularly designed metamaterial micro-nano-structure. In addition, by scaling their size, we can scale their response from radio frequency to optical wavelength region, which means we can design metamaterials detector operated at desired frequency in a very wide frequency range, for example from UV-IR-Microwave-RF, but in THz region is our key topic content in this paper.
As demonstrated that metamaterials can be used to remarkably response incident THz radiation with both electric and magnetic resonant mode7, metamaterials micro-nano-structures are potential for future THz detection. By constructing metamaterials detectors for relatively wide THz wave, we can realize THz sensing and further imaging. In this paper, we design and simulate an electrically resonant terahertz metamaterial sensing unit. This kind of metamaterial micro-nano-structure can present an obvious response at 0.78 THz with a strong electrical resonant at the split-ring resonator（SRR） gap, and thus provides a possibility to obtain the electrical signal so as to achieve THz sensing. By analyzing the simulation results, we summarize the feasibility of terahertz detection, and come out a layout of terahertz detector by scaling the size of metamaterial detector unit, we can obtain unit detector architecture that also resonant at other frequencies and finally lead to realize multispectral imaging.
VLSI implementation of multiple large template-based image matching for automatic target recognition
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