基于双复合结构层的宽带太赫兹超材料吸收体
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摘要
提出了一种基于双复合结构层(CSLs)的宽带太赫兹超材料吸收体,其中复合结构层I由4个不同的圆环金属结构组成,复合结构层II由4个不同的方形金属结构组成。采用时域有限差分法详细研究和讨论了吸收体的吸收谱线、磁场能量分布、表面电流分布,以及偏振角度和入射角度对吸收的影响。结果表明:该吸收体能够有效抑制高阶共振峰,特别是当太赫兹波正入射时,吸收率大于90%的吸收带宽可达0.722 THz,中心频率为2.041 THz。
A broadband terahertz metamaterial absorber is proposed based on the double composite structure layers(CSLs). The composite structure layer I and composite structure layer II comprise four different-sized gold rings and square plates, respectively. Further, the finite difference time domain(FDTD) method is employed to theoretically investigate and discuss the effects of absorption spectrum, magnetic field distribution, surface current distribution, polarization angle, and incident angle on absorption. The results show that the high-order resonance peaks can be effectively suppressed by this absorber. Furthermore, in case of normal incidence, the absorption bandwidth corresponding to absorptivity greater than 90% is 0.722 THz, and its central frequency is approximately 2.041 THz.
A broadband terahertz metamaterial absorber is proposed based on the double composite structure layers(CSLs). The composite structure layer I and composite structure layer II comprise four different-sized gold rings and square plates, respectively. Further, the finite difference time domain(FDTD) method is employed to theoretically investigate and discuss the effects of absorption spectrum, magnetic field distribution, surface current distribution, polarization angle, and incident angle on absorption. The results show that the high-order resonance peaks can be effectively suppressed by this absorber. Furthermore, in case of normal incidence, the absorption bandwidth corresponding to absorptivity greater than 90% is 0.722 THz, and its central frequency is approximately 2.041 THz.
引文
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[24] Wang B X,Wang L L,Wang G Z,et al.A simple design of ultra-broadband and polarization insensitive terahertz metamaterial absorber[J].Applied Physics A,2014,115(4):1187-1192.
[25] Li X W,Liu H J,Sun Q B,et al.Ultra-broadband and polarization-insensitive wide-angle terahertz metamaterial absorber[J].Photonics and Nanostructures-Fundamentals and Applications,2015,15:81-88.
[26] Ye Y Q,Jin Y,He S L.Omnidirectional,polarization-insensitive and broadband thin absorber in the terahertz regime[J].Journal of the Optical Society of America B,2010,27(3):498-504.
[2] O′Hara J,Grischkowsky D.Quasi-optic terahertz imaging[J].Optics Letters,2001,26(23):1918-1920.
[3] Stoik C D,Bohn M J,Blackshire J L.Nondestructive evaluation of aircraft composites using transmissive terahertz time domain spectroscopy[J].Optics Express,2008,16(21):17039-17051.
[4] Huang K C,Wang Z C.Terahertz terabit wireless communication[J].IEEE Microwave Magazine,2011,12(4):108-116.
[5] Wen Q Y,Zhang H W,Xie Y S,et al.Dual band terahertz metamaterial absorber:design,fabrication,and characterization[J].Applied Physics Letters,2009,95(24):241111.
[6] Wang J L,Zhang B Z,Duan J P,et al.Flexible dual-stopband terahertz metamaterial filter[J].Acta Optica Sinica,2017,37(10):1016001.王俊林,张斌珍,段俊萍,等.柔性双阻带太赫兹超材料滤波器[J].光学学报,2017,37(10):1016001.
[7] Tao H,Landy N I,Bingham C M,et al.A metamaterial absorber for the terahertz regime:design,fabrication and characterization[J].Optics Express,2008,16(10):7181-7188.
[8] Ye L F,Chen Y,Cai G X,et al.Broadband absorber with periodically sinusoidally-patterned graphene layer in terahertz range[J].Optics Express,2017,25(10):11223-11232.
[9] Zhang X,Li H Q,Wei Z Y,et al.Metamaterial for polarization-incident angle independent broadband perfect absorption in the terahertz range[J].Optical Materials Express,2017,7(9):3294-3302.
[10] Guo Y H,Yan L S,Pan W,et al.Ultra-broadband terahertz absorbers based on 4×4 cascaded metal-dielectric pairs[J].Plasmonics,2014,9(4):951-957.
[11] Gao H,Yan F P,Tan S Y,et al.Design of ultra-thin broadband terahertz metamaterial absorber based on patterned graphene[J].Chinese Journal of Lasers,2017,44(7):0703024.高红,延凤平,谭思宇,等.基于有图案石墨烯的超薄宽带太赫兹超材料吸收体的设计[J].中国激光,2017,44(7):0703024.
[12] Grant J,Ma Y,Saha S,et al.Polarization insensitive,broadband terahertz metamaterial absorber[J].Optics Letters,2011,36(17):3476-3478.
[13] Wang G D,Liu M H,Hu X W,et al.Broadband and ultra-thin terahertz metamaterial absorber based on multi-circular patches[J].The European Physical Journal B,2013,86(7):304.
[14] Chen X,Fan W H.Ultra-flexible polarization-insensitive multiband terahertz metamaterial absorber[J].Applied Optics,2015,54(9):2376-2382.
[15] Xu Z C,Gao R M,Ding C F,et al.Photoexcited broadband blueshift tunable perfect terahertz metamaterial absorber[J].Optical Materials,2015,42:148-151.
[16] Wen Y Z,Ma W,Bailey J,et al.Planar broadband and high absorption metamaterial using single nested resonator at terahertz frequencies[J].Optics Letters,2014,39(6):1589-1592.
[17] Amin M,Farhat M,Ba.An ultra-broadband multilayered graphene absorber[J].Optics Express,2013,21(24):29938-29948.
[18] Chen Q,Sun F H,Song S C.Subcell misalignment in vertically cascaded metamaterial absorbers[J].Optics Express,2013,21(13):15896-15903.
[19] He S L,Chen T.Broadband THz absorbers with graphene-based anisotropic metamaterial films[J].IEEE Transactions on Terahertz Science and Technology,2013,3(6):757-763.
[20] Zhu J F,Ma Z F,Sun W J,et al.Ultra-broadband terahertz metamaterial absorber[J].Applied Physics Letters,2014,105(2):021102.
[21] Peng Y,Zang X F,Zhu Y M,et al.Ultra-broadband terahertz perfect absorber by exciting multi-order diffractions in a double-layered grating structure[J].Optics Express,2015,23(3):2032-2039.
[22] Pu M B,Wang M,Hu C G,et al.Engineering heavily doped silicon for broadband absorber in the terahertz regime[J].Optics Express,2012,20(23):25513-25519.
[23] Yin S,Zhu J F,Xu W D,et al.High-performance terahertz wave absorbers made of silicon-based metamaterials[J].Applied Physics Letters,2015,107(7):073903.
[24] Wang B X,Wang L L,Wang G Z,et al.A simple design of ultra-broadband and polarization insensitive terahertz metamaterial absorber[J].Applied Physics A,2014,115(4):1187-1192.
[25] Li X W,Liu H J,Sun Q B,et al.Ultra-broadband and polarization-insensitive wide-angle terahertz metamaterial absorber[J].Photonics and Nanostructures-Fundamentals and Applications,2015,15:81-88.
[26] Ye Y Q,Jin Y,He S L.Omnidirectional,polarization-insensitive and broadband thin absorber in the terahertz regime[J].Journal of the Optical Society of America B,2010,27(3):498-504.