全介质超周期光栅太赫兹波段宽带完美反射器设计
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摘要
提出一种超周期全介质光栅结构,该类结构在单个周期内具有多个不同宽度亚单元光栅条,基于优化超周期单元结构的占空比、高度以及光栅条宽度等几何参数,实现太赫兹波段(1.2-2.0 THz)宽带完美反射特性。利用S-参数反演算法,有效提取亚波长超周期全介质光栅结构的等效参数,包括等效折射率、等效介电常数、等效磁导率以及等效阻抗。分析超周期光栅结构等效参数,结合完美反射条件,证实该类光栅结构的宽带完美反射特性。基于矢量全波计算方法,数值模拟超周期光栅结构的电磁场分布,揭示其宽带太赫兹波完美反射Mie氏谐振特性和电磁耦合特性。
In this paper,we propose a ultra-period all-dielectric grating metamaterial structure.This structure has multiple sub-cell structure in a single big period.By optimizing the structure parameters of the super-period grating structure,such as the duty cycle,height and the width of the grating strip,the broadband perfect reflection is achieved with the bandwidth of 1.2-2.0 THz.Through the S-parameter inversion algorithm,the equivalent parameters of the sub-wavelength superperiodic all-dielectric grating structure are extracted,including equivalent refractive index,equivalent permittivity,equivalent magnetic permeability and equivalent impedance.By analyzing the equivalent parameters and combining the perfect reflection conditions,the perfect reflection characteristics of the super-period grating structure proposed in this paper are confirmed.Based on the full-wave vector numerical simulation method,the electromagnetic field distribution characteristics of the super-period grating structure are calculated,and the Mie resonance characteristics and electromagnetic coupling characteristics of the broadband terahertz perfect reflection super-period grating structure are analyzed.
In this paper,we propose a ultra-period all-dielectric grating metamaterial structure.This structure has multiple sub-cell structure in a single big period.By optimizing the structure parameters of the super-period grating structure,such as the duty cycle,height and the width of the grating strip,the broadband perfect reflection is achieved with the bandwidth of 1.2-2.0 THz.Through the S-parameter inversion algorithm,the equivalent parameters of the sub-wavelength superperiodic all-dielectric grating structure are extracted,including equivalent refractive index,equivalent permittivity,equivalent magnetic permeability and equivalent impedance.By analyzing the equivalent parameters and combining the perfect reflection conditions,the perfect reflection characteristics of the super-period grating structure proposed in this paper are confirmed.Based on the full-wave vector numerical simulation method,the electromagnetic field distribution characteristics of the super-period grating structure are calculated,and the Mie resonance characteristics and electromagnetic coupling characteristics of the broadband terahertz perfect reflection super-period grating structure are analyzed.
引文
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[20] Smith D,Schultz S,Marko P,et al.Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients[J].Physical Review B,2002,65(19):195104.
[2] Pham P,Zhang W,Quach N,et al.Broadband impedance match to two-dimensional materials in the terahertz domain[J].Nature Communications,2017,8:1-8.
[3] Curry E,Fabbri S,Maxson J,et al.Meter-scale terahertz-driven acceleration of a relativistic beam[J].Physical Review Letters,2018,120(9):094801.
[4] Zhou D,Hou L,Yuan Y,et al.Bifocal dual reflector system for active terahertz imaging[J].Applied Optics,2018,57(12):3224-3230.
[5] YU Yao,CAI Jin-hua,SUN Jian-dong,et al.Fabrication and characterization of a wide-bandgap and high-terahertz distributed-Bragg-reflector micro cavities[J].Optics Communications,2018,426:84-88.
[6] SUN Kai,Christoph A Riedel,Alessandro Urbani,et al.VO2 thermo-chromic metamaterial-based smart optical solar reflector[J].ACS Photonics,2018,5(6):2280-2286.
[7] HUANG Ya-li,XU Hai-xia,LU Yan-xin,et al.All-dielectric metasurface for achieving perfect reflection at visible wavelengths[J].Journal of Physical Chemistry C,2018,122(5):2990-2996.
[8] Chow E,Lin S Y,Johnson S G,et al.Three-dimensional control of light in a two-dimensional photonic crystalslab[J].Nature,2000,407:983-986.
[9] Yang L,Tian J,Giddens H,et al.Magnetically tunable graphene-based reflector under linear polarized incidence at room temperature[J].Applied Physics Letters,2018,112(15):151103.
[10] Pendry J B,Schurig D,Smith D R.Controlling electromagnetic fields[J].Science,2016,312:1780-1782.
[11] Amin M,Siddiqui O,Farhat M,et al.A perfect fresnel acoustic reflector implemented by a Fano-resonant metascreen[J].Journal of Applied Physics,2018,123:144502.
[12] Gu J,Singh R,Liu X,et al.Active control of electromagnetically induced transparency analogue in terahertz metamaterials[J].Nature Communications,2012,3:1151.
[13] Smith D R,Pendry J B,Wiltshire M C.Metamaterials and negative refractive index[J].Science,2004,305(5685):788-792.
[14] Moitra P,Slovick B A,Li W,et al.Large-scale all-dielectric metamaterial perfect reflectors[J].ACS Photonics,2015,2(6):692-698.
[15] Liu Z,Liu X,Ang W Y,et al.High-index dielectric meta-materials for near-perfect broadband reflectors[J].Journal of Physics D:Applied Physics,2016,49(19):195101.
[16] Slovick B,Yu Z G,Berding M,et al.Perfect dielectric-metamaterial reflector[J].Physical Review B,2013,88(16):165116.
[17] Moitra P,Slovick B A,Yu Z,et al.Experimental demonstration of a broadband all-dielectric metamaterial perfect reflector[J].Applied Physics Letters,2014,104(17):171102.
[18] Wheeler M,Aitchison J S,Mojahedi M.Three-dimensional array of dielectric spheres with an isotropic negative permeability at infrared frequencies[J].Physical Review B,2005,72(19):193103.
[19] Kazuyuki Yamae,Hiroshi Fukshima,Kozo Fujimoto.Omnidirectional reflector with total internal reflective interface for light extraction enhancement of solid-state light source[J].Phys.Status Solidi A,2018,1700775.
[20] Smith D,Schultz S,Marko P,et al.Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients[J].Physical Review B,2002,65(19):195104.
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