柔性可弯曲人工超构材料太赫兹波超吸收研究
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摘要
近年来,由亚波长人工微结构单元组成的超构材料,因其具有自然材料所不具备的奇特物理性质,吸引了人们的广泛关注.其中最有趣的应用之一就是利用亚波长人工微结构增强对电磁波的吸收.设计并实现了一种人工超构材料柔性可弯曲的高性能太赫兹吸收器.为了实现最优的结构设计,分别对器件的结构周期、金属条宽度、介质层厚度和材料光学性质等关键结构及材料参数进行了系统优化.实验结果显示在频率3 THz附近器件峰值吸收率高达99%,与数值模拟结果相吻合.
In recent years,Metamaterials,artificial electromagnetic materials that are constructed by subwavelength units,have demonstrated unusual abilities to manipulate electromagnetic waves and promised many potential applications. One of the most intriguing applications of metamaterials is to function as high performance absorbing medium. In this work,a newtype of plasmonic flexible metasurfacebased super-absorber for Terahertz waves is designed,fabricated and characterized. Dependences of absorption on the optical properties of component materials and geometric parameters are optimized by full-wave numerical simulations,and then confirmed by experiments. Experimental results showthat an absorption peak value of 99% is obtained at the frequency of 3 THz,which are in good agreement with numerical simulations.
In recent years,Metamaterials,artificial electromagnetic materials that are constructed by subwavelength units,have demonstrated unusual abilities to manipulate electromagnetic waves and promised many potential applications. One of the most intriguing applications of metamaterials is to function as high performance absorbing medium. In this work,a newtype of plasmonic flexible metasurfacebased super-absorber for Terahertz waves is designed,fabricated and characterized. Dependences of absorption on the optical properties of component materials and geometric parameters are optimized by full-wave numerical simulations,and then confirmed by experiments. Experimental results showthat an absorption peak value of 99% is obtained at the frequency of 3 THz,which are in good agreement with numerical simulations.
引文
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[6]Smye S W,Chamberlain J M,Fitzgerald A J,et al. The interaction between Terahertz radiation and biological tissue[J]. Physics in Medicine and Biology,2001,46(9):R101-R112.
[7]Siegel P H. Terahertz technology in biology and medicine[J]. Ieee Transactions on Microwave Theory and Techniques,2004,52(10):2438-2447.
[8]CAO Jun-Cheng,Research progress of terahertz sources and detectors[J]. Journal of Functional Materials and Devices(曹俊诚.太赫兹辐射源与探测器研究进展.功能材料与器件学报),2003(02):111-117.
[9]ZHAO Guo-Zhong. Progress on terahertz science and technology[J]. Foreign Electronic Measurement Technology(赵国忠.太赫兹科学技术研究的新进展.国外电子测量技术),2014,33(02):1-6.
[10]Ye Yu-Quan,Jin Yi,He Sai-lin. Omnidirectional,polarization-insensitive and broadband thin absorber in the terahertz regime[J]. Journal of the Optical Society of America B-Optical Physics,2010,27(3):498-504.
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[12]Pendry J B,Holden A J,Stewart W J,et al. Extremely low frequency plasmons in metallic mesostructures[J].Physical Review Letters,1996,76(25):4773-4776.
[13]Smith D R,Padilla W J,Vier D C,et al. Composite medium with simultaneously negative permeability and permittivity[J]. Physical Review Letters,2000,84(18):4184-4187.
[14]Smith D R,Pendry J B,Wiltshire M C K. Metamaterials and negative refractive index[J]. Science,2004,305(5685):788-792.
[15]Schedin F,Geim A K,Morozov S V,et al. Detection of individual gas molecules adsorbed on graphene[J]. Nature Materials,2007,6(9):652-655.
[16]Szabo Z,Park G-H,Hedge R,et al. A Unique Extraction of Metamaterial Parameters Based on Kramers-Kronig Relationship[J]. Ieee Transactions on Microwave Theory and Techniques,2010,58(10):2646-2653.
[17]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.
[18]Liu X,Starr T,Starr A F,et al. Infrared Spatial and Frequency Selective Metamaterial with Near-Unity Absorbance[J]. Physical Review Letters,2010,104(20):207403.
[19]Hao J,Zhou L,Qiu M. Nearly total absorption of light and heat generation by plasmonic metamaterials[J]. Physical Review B,2011,83(16).
[20]Xu X,Peng B,Li D,et al. Flexible Visible-Infrared Metamaterials and Their Applications in Highly Sensitive Chemical and Biological Sensing[J]. Nano Letters,2011,11(8):3232-3238.
[21]Singh R,Cao W,Al-Naib I,et al. Ultrasensitive terahertz sensing with high-Q Fano resonances in metasurfaces[J].Applied Physics Letters,2014,105(17):5.
[22]Zhu J,Ma Z,Sun W,et al. Ultra-broadband terahertz metamaterial absorber[J]. Applied Physics Letters,2014,105(2):021102.
[23]LIU Yi,PENG Xiao-yu,WANG Zuo-bin,et al. Terahertz-wave Absorber Based on Metamaterial[J]. Infrared Technology(刘毅,彭晓昱,王作斌等,基于超材料的太赫兹波吸波材料.红外技术),2015,37(09):756-763.
[24]Neese B,Chu B,Lu S-G,et al. Large electrocaloric effect in ferroelectric polymers near room temperature[J]. Science,2008,321(5890):821-823.
[25]Lang S B,Muensit S. Review of some lesser-known applications of piezoelectric and pyroelectric polymers[J]. Applied Physics a-Materials Science&Processing,2006,85(2):125-134.
[26]Bai M,Poulsen M,Sorokin A V,et al. Infrared spectroscopic ellipsometry study of vinylidene fluoride(70%)-trifluoroethylene(30%)copolymer Langmuir-Blodgett films[J]. Journal of Applied Physics,2003,94(1):195-200.