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ultra-broadband linear polarization conversion via diode-like asymmetric transmission with composite metamaterial for terahertz waves
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نویسنده
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cheng yongzhi ,gong rongzhou ,wu lin
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منبع
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plasmonics - 2017 - دوره : 12 - شماره : 4 - صفحه:1113 -1120
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چکیده
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In this paper, a tri-layer metamaterial composed of a split-disk structure array sandwiched with two layers of twisted sub-wavelength metal grating is proposed and investigated numerically in terahertz region. the numerical results exhibit that linear polarization conversion via diode-like asymmetric transmission for terahertz waves within ultra-broadband frequency range is achieved due to fabry-perot-like resonance. in our design, the conversion polarization transmission coefficient for normal incidence is greater than 90 % in the range of 0.23–1.17 thz, equivalent to 134.3 % relative bandwidth. the physical mechanism of the broadband linear polarization conversion effect is further illustrated by simulated electrical field distributions.
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کلیدواژه
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split-disk structure ,composite metamaterial ,polarization conversion ,asymmetric transmission
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آدرس
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wuhan university of science and technology, school of information science and engineering, china. huazhong university of science and technology, school of optical and electronic information, china, huazhong university of science and technology, school of optical and electronic information, china, nanyang technological university, school of electrical and electronic engineering, singapore
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Authors
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