Narrowband perfect terahertz absorber based on polar-dielectrics metasurface  

作　　者：Meng-Meng Zhao Shu-Fang Fu † Sheng Zhou Yu-Ling Song Qiang Zhang Yong-Qi Yin Yu-Tian Zhao Hong Liang Xuan-Zhang Wang 赵萌萌;付淑芳;周胜;宋玉玲;张强;尹永琦);赵玉田;梁红;王选章(Key Laboratory for Photonic and Electronic Bandgap Materials(Ministry of Education),School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,China;Department of Electrical Engineering,University of California,Riverside,California 92521,USA;School of Technology,Harbin Normal University,Harbin 150086,China)

机构地区：[1]Key Laboratory for Photonic and Electronic Bandgap Materials(Ministry of Education),School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,China [2]Department of Electrical Engineering,University of California,Riverside,California 92521,USA [3]School of Technology,Harbin Normal University,Harbin 150086,China

出　　处：《Chinese Physics B》2020年第5期297-302,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11204056);Harbin Normal University Master’s Innovation Project(Grant Nos.HSDSSCX2018-77 and HSDSSCX2018-79);Key Laboratory of Engineering Dielectrics and Its Application(Harbin University of Science and Technology);Ministry of Education,China(Grant No.KF20171110);Natural Science Foundation of Heilongjiang Province,China(Grant No.LH2019A028).

摘　　要：We theoretically propose a narrowband perfect absorber metasurface(PAMS) based on surface phonon polaritons in the terahertz range. The PAMS has unit cell consisting of a silver biarc on the top, a thin polar-dielectric in the middle and a silver layer at the bottom. The phonon polaritons are excited at the interface between the silver biarc and the polar dielectric, and enhance the absorption of the PAMS. The absorption peak is at 36.813 μm and the full width half maximum(FWHM) is nearly 36 nm, independent of the polarization and incidence angle. The electric fields are located at the split of the biarc silver layer and the quality factor Q is 1150. The FWHM decreases with the decreasing split width. When the thickness of the bottom layer is larger than 50 nm, the narrow band and high absorption are insensitive to the thickness of those layers. The designed absorber may have useful applications in terahertz spectra such as energy harvesting, thermal emitter, and sensing.

关 键 词：metasurface narrowband perfect absorber TERAHERTZ polar-dielectrics 

分 类 号：TB34[一般工业技术—材料科学与工程] O441.4[理学—电磁学]