Au/VO_2结构可调控红外吸收器
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摘要
设计了一种基于Au/VO_2结构的可调控红外吸收器,由谐振贴片、介质夹层和金属背板3层结构组成。利用VO_2的温控相变特性,将部分田字形Au贴片结构替换为VO_2,通过改变环境温度对吸收器的吸收峰值、位置和带宽进行调控。由于VO_2具有温控相变特性,吸收器会在不同温度下表现出不同的吸波效果。当温度高于相变温度时,吸收器在远红外大气窗口形成一个吸收率为99.68%的吸收峰;当温度低于相变温度时,吸收器在中、远红外大气窗口分别形成吸收率为89.29%和99.83%的吸收峰。利用表面电流和磁场分布对吸收器的吸波机理进行分析,发现反向平行分布的表面电流激发出磁偶极子,进而产生强烈的磁谐振,达到吸波效果。最后分析了电磁波的极化方式和入射角度以及介质材料属性对吸波效果的影响,发现此吸收器具有较好的极化稳定性和大角度吸收性,并且吸收峰随着介电常数的增大向长波方向漂移。
An infrared absorber based on Au/VO_2 structure is designed in this paper.This tunable metamaterial absorber consists of three individual layers of resonating patch,sandwich dielectric layer,and metallic background.Using the temperature-controlled phase change characteristics of VO_2,some of the Tian-shaped Au structure is replaced by VO_2,and the absorption peak,position and bandwidth of the absorber can be controlled by changing the ambient temperature.Because of the thermo-control phase transformation property of the VO_2,the absorber is characteristic of different absorption effects at different temperatures.When the temperature is higher than the phase transition temperature,the absorber can form an absorption peak of 99.68%in the far infrared atmospheric window;when the temperature is lower than the phase transition temperature,the absorber can form two absorption peaks with absorption rates of89.29%and 99.83%respectively in the middle and far infrared atmospheric windows.This paper analyzes the absorption mechanism of the absorber based on the surface current distribution and the surface magnetic field.From the mentioned above the paper finds that the anti-parallel distribution of surface current excites a magnetic dipole,which generates a strong magnetic resonance,achieving the effect of absorption.In the end,this paper researches the effect of electromagnetic wave polarization mode,incident angle and media material properties on the absorption properties of the absorber.The results show that the absorption is insensitive to polarization mode and incident angle.What's more,The absorption peak shifts its way in long wavelength direction with the increase of the dielectric constant.
An infrared absorber based on Au/VO_2 structure is designed in this paper.This tunable metamaterial absorber consists of three individual layers of resonating patch,sandwich dielectric layer,and metallic background.Using the temperature-controlled phase change characteristics of VO_2,some of the Tian-shaped Au structure is replaced by VO_2,and the absorption peak,position and bandwidth of the absorber can be controlled by changing the ambient temperature.Because of the thermo-control phase transformation property of the VO_2,the absorber is characteristic of different absorption effects at different temperatures.When the temperature is higher than the phase transition temperature,the absorber can form an absorption peak of 99.68%in the far infrared atmospheric window;when the temperature is lower than the phase transition temperature,the absorber can form two absorption peaks with absorption rates of89.29%and 99.83%respectively in the middle and far infrared atmospheric windows.This paper analyzes the absorption mechanism of the absorber based on the surface current distribution and the surface magnetic field.From the mentioned above the paper finds that the anti-parallel distribution of surface current excites a magnetic dipole,which generates a strong magnetic resonance,achieving the effect of absorption.In the end,this paper researches the effect of electromagnetic wave polarization mode,incident angle and media material properties on the absorption properties of the absorber.The results show that the absorption is insensitive to polarization mode and incident angle.What's more,The absorption peak shifts its way in long wavelength direction with the increase of the dielectric constant.
引文
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[2] SCHURING D,MOCK J J,JUSTICE B J,et al.Metamaterial Electromagnetic Cloak at Microwave Frequencies[J].Science,2006,314(5801):977-980.
[3] LIU Z,LEE H,XIONG Y,et al.Far-Field Optical Hyperlens Magnifying Sub-Diffraction-Limited Objects[J].Science,2007,315(5819):1686-1686.
[4] LANDY N I,SAJUYIGBE S,MOCK J J,et al.Perfect Metamaterial Absorber[J].Physical Review Letters,2008,100(20):207402.
[5]孙丹丹,陈智,文岐业,等.二氧化钒薄膜低温制备及其太赫兹调制特性研究[J].物理学报,2013,62(1):393-398.SUN D D,CHEN Z,WEN Q Y,et al.VO2Low Temperature Deposition and Terahertz Transmission Modulation[J].Acta Phys Sin,2013,62(1):393-398.(in Chinese)
[6] DICKEN M J,AYDIN K,PRYCE I M,et al.Frequency Tunable Near-infrared Metamaterials Based on VO2Phase Transition[J].Optics Express,2009,17(20):18330-18339.
[7] KOCER H,BUTUN S,BANAR B,et al.Thermal Tuning of Infrared Resonant Absorbers Based on Hybrid Gold-VO2 Nanostructures[J].Applied Physics Letters,2015,106(16):7181-7188.
[8] 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):.
[9]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.WU Z Y,LI Y,CHEN P Z,et al.Design of Tunable Infrared Absorber Based on Au/VO2Nanostructures[J].Journal of Infrared Millim Waves,2016,35(6):694-700.(in Chinese)
[10]YANG J,QU S,MA H,et al.Dual-Band Tunable Infrared Metamaterial Absorber with VO2 Conformal Resonators[J].Optics Communications,2017,402:518-522.
[11]CHOI H S,AHN J S,JUNG J H,et al.Mid-Infrared Properties of a VO2 Film Near the Metal-Insulator Transition[J].Physical Review B Condensed Matter,1996,54(7):4621.
[12]NAOREM R,DAYAL G,RAMAKRISHNA S A,et al.Thermally Switchable Metamaterial Absorber with a VO2 Ground Plane[J].Optics Communications,2015,346:154-157.