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broadband terahertz absorption in graphene-embedded photonic crystals
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نویسنده
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fan yuancheng ,tu luqi ,zhang fuli ,fu quanhong ,zhang zhengren ,wei zeyong ,li hongqiang
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منبع
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plasmonics - 2018 - دوره : 13 - شماره : 4 - صفحه:1153 -1158
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چکیده
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The absorption in graphene is rather low at terahertz frequencies. here, we present a graphene-embedded photonic crystal structure to realize broadband terahertz absorption in graphene. the approach provides absorption enhancement in the whole terahertz regime (from 0.1 to 10 thz). it is shown that the average absorption in the graphene-embedded photonic crystal can be enhanced in the multiple propagating bands of the photonic crystals. the absorption efficiency can be further improved by optimizing the characteristic frequency, optical thickness ratio in a unit cell, and the angle of incidence on the photonic crystals. a maximum broadband absorption factor of 28.8% was achieved for fixed alternative dielectric materials. the graphene-embedded photonic crystal is promising for terahertz functional devices with broadband response.
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کلیدواژه
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graphene ,photonic crystals ,terahertz absorption ,surface conductivity
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آدرس
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ministry of education and department of applied physics, northwestern polytechnical university, school of science, key laboratory of space applied physics and chemistry, china, ministry of education and department of applied physics, northwestern polytechnical university, school of science, key laboratory of space applied physics and chemistry, china, ministry of education and department of applied physics, northwestern polytechnical university, school of science, key laboratory of space applied physics and chemistry, china, ministry of education and department of applied physics, northwestern polytechnical university, school of science, key laboratory of space applied physics and chemistry, china, chongqing jiaotong university, school of materials science and engineering, china, tongji university, key laboratory of advanced micro-structure materials (moe) and department of physics, china. institute of dongguan-tongji university, china, tongji university, key laboratory of advanced micro-structure materials (moe) and department of physics, china. institute of dongguan-tongji university, china
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Authors
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