W/VO_2周期性纳米盘阵列可调中红外宽频吸收器
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摘要
为了实现对3～5μm中红外光的完美吸收,仿真设计了一种基于W/VO2周期性纳米盘阵列的可调中红外宽频吸收器,利用时域有限差分法模拟计算了结构参数对吸收器性能的影响.在最佳结构参数条件下,吸收器表现出偏振无关和广角吸收的特性,在3.1～3.6μm范围内吸收率达99%以上,峰值吸收率为99.99%.低温时入射光的磁场被束缚在各单元VO2介质层的中心并得到完美吸收;高温时VO2发生相变表现为金属相,抑制吸收,高低温的吸收率差值可达78.8%.该吸收器有效弥补了传统吸收器吸收频带窄、吸收率不可调的缺陷,对中红外光电器件的应用有参考价值.
In order to realize the perfect absorption of 3～5μm mid-infrared wave,a tunable mid-infrared broadband absorber based on W/VO2 periodic nanodisk array is designed in this paper.The effects of structural parameters on the absorption performance are calculated by the Finite-Difference TimeDomain.With the optimal structural parameters,the absorber is polarization-independent and exhibits wide-angle absorption.The absorptivity is over 99% in the range of 3.1～3.6μm,and the maximum absorptivity is 99.99%.At low temperature,the absorber presents a perfect absorption because the magnetic field is trapped in the center of each cell's VO2 dielectric layer.While at high temperature,the VO2 film is converted to metallic phase in which the absorber displays a strong reflection.The absorption difference between high and low temperature is up to 78.8%.The absorber effectively compensates for the shortcomings of the traditional absorber with a narrow absorption band and inability to regulate the absorptivity.The result of this study is of valuable reference to the application of mid-infrared optoelectronic devices.
In order to realize the perfect absorption of 3～5μm mid-infrared wave,a tunable mid-infrared broadband absorber based on W/VO2 periodic nanodisk array is designed in this paper.The effects of structural parameters on the absorption performance are calculated by the Finite-Difference TimeDomain.With the optimal structural parameters,the absorber is polarization-independent and exhibits wide-angle absorption.The absorptivity is over 99% in the range of 3.1～3.6μm,and the maximum absorptivity is 99.99%.At low temperature,the absorber presents a perfect absorption because the magnetic field is trapped in the center of each cell's VO2 dielectric layer.While at high temperature,the VO2 film is converted to metallic phase in which the absorber displays a strong reflection.The absorption difference between high and low temperature is up to 78.8%.The absorber effectively compensates for the shortcomings of the traditional absorber with a narrow absorption band and inability to regulate the absorptivity.The result of this study is of valuable reference to the application of mid-infrared optoelectronic devices.
引文
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[3] LEONHARDT U.Optical conformal mapping[J].Science,2006,312(5781):1777-1780.
[4] ERGIN T,STENGER N,BRENNER P,et al.Three-dimensional invisibility cloak at optical wavelengths[J].Science,2010,328(5976):337-339.
[5] ZHAO Ya-juan,ZHOU Bi-cheng,ZHANG Han,et al.Broadband tunable filter based on square loop metamaterial[J].Acta Photonica Sinica,2018,47(7):0723003.赵亚娟,周必成,张晗,等.方环结构的宽频可调超材料滤波器[J].光子学报,2018,47(7):0723003.
[6] ZHANG Hao,TONG Yuan-wei.Tunable pass-band filter based on one dimensional split ring resonant structure[J].Acta Photonica Sinica,2018,47(7):0723002.张浩,童元伟.基于一维金属开口谐振环的可调带通滤波器[J].光子学报,2018,47(7):0723002.
[7] ZHANG X,LIU Z.Superlenses to overcome the diffraction limit[J].Nature Materials,2008,7(6):435-441.
[8] PAN L,PARK Y,XIONG Y,et al.Maskless plasmonic lithography at 22nm resolution[J].Scientific Reports,2011,1(11):116-120.
[9] LANDY N I,SAJUYIGBE S,MOCK J J,et al.Perfect metamaterial absorber[J].Physical Review Letter,2008,100(20):207402.
[10] WEI Dong,ZHANG Gui-zhong,DING Xin,et al.Analysis of optical properties of metal-dielectric microplate array infrared absorber[J].Acta Photonica Sinica,2017,46(8):0823005.魏东,张贵忠,丁欣,等.金属-电介质微盘阵列红外吸收器的光学特性分析[J].光子学报,2017,46(8):0823005.
[11] FENG R,DING W,LIU L,et al.Dual-band infrared perfect absorber based on asymmetric T-shaped plasmonic array[J].Optics Express,2014,22(S2):A335.
[12] 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):207402.
[13] CHAO G U,SHAOBO Q U,PEI Z B,et al.Planar metamaterial absorber based on lumped elements[J].Chinese Physics Letters,2010,27(11):117802-117804.
[14] ZHU J,MA Z,SUN W,et al.Ultra-broadband terahertz metamaterial absorber[J].Applied Physics Letters,2014,105(2):4773-79.
[15] WANG H,WANG L.Perfect selective metamaterial solar absorbers[J].Optics Express,2013,21(22):A1078-A1093.
[16] POPURI S R,ARTEMENKO A,DECOURT R,et al.Presence of peierls pairing and absence of insulator-to-metal transition in VO2(A):a structure-property relationship study[J].Physical Chemistry Chemical Physics,2017,19(9):6601-6609.
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[18] KOCER H,BUTUN S,BANAR B,et al.Thermal tuning of infrared resonant absorbers based on hybrid gold-VO2nanostructures[J].Applied Physics Letters,2015,106(16):7181-7188.
[19] WU Zheng-yi,LI Yi,CHEN Pei-zu,et al.Design of tunable infrared absorber based on Au/VO2nanostructures[J].Journal of Infrared&Millimeter Waves,2016,35(6):694-700.伍征义,李毅,陈培祖,等.基于Au/VO2纳米结构的可调控红外吸收器设计[J].红外与毫米波学报,2016,35(6):694-700.
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[23] SCHMID F,KHATTAK C P,FELT D M,et al.Current status of very large sapphire crystal growth for optical applications[C].SPIE,1999,3705:70-76.
[24] WANG Hai-fang,LI Yi,YU Xiao-jing,et al.Study on temperature dependence of infrared optical properties of vanadium dioxide thin film[J].Acta Optica Sinica,2010,30(5):1522-1526.王海方,李毅,俞晓静,等.二氧化钒薄膜的变温红外光学特性研究[J].光学学报,2010,30(5):1522-1526.
[25] LIU M Z,YI L I,ZHANG J,et al.Design and fabrication of a tunable infrared metamaterial absorber based on VO2films[J].Journal of Physics D Applied Physics,2017,50(38):385104.