一种基于耦合共振的太赫兹双频超材料吸收器设计
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摘要
以两个相耦合的非对称十字金属条带结构作为基元,设计了一种新型双频带太赫兹超材料吸收器。该吸收器由周期性排列的基元、金属接地板以及介质层组成。通过基元之间的耦合,可利用单一基元实现太赫兹波段的双频带吸收特性。仿真结果表明,设计的超材料吸收器在具有基频共振所形成的吸收峰外,还具有耦合共振所形成的耦合吸收峰。通过调节耦合强度、介质层厚度和金属条带的对称性,可以在保持磁共振模式的耦合共振峰频率基本稳定的同时,对基频共振峰频率进行调控,以满足不同的吸收要求。此外,该超材料吸收器也展现出对气体折射率变化的敏感性,灵敏度可达2.5 THz/RIU,使这种吸收器在气体传感方面具有巨大的潜力。
In this paper,a new type of dual-band terahertz metamaterial absorber was designed.The unit cell of this absorber was consisted of two coupled asymmetrical metallic cross strips and a dielectric layer on top of a metallic ground plane.The dual-band absorption effect was realized by the the coupling between the unit cells.The dual-band absorption effect was confirmed by the simulation results.The absorption peak frequency of the fundamental mode resonance can be further adjusted by modifying the distance between the unit cell,the thickness of dielectric layer and the symmetry of the cross stripe,according to the simulated results.Moreover,this metamaterial absorber demonstrates high sensitivity to the change of refractive index of the gas,which makes it promising for gas sensing applications.
In this paper,a new type of dual-band terahertz metamaterial absorber was designed.The unit cell of this absorber was consisted of two coupled asymmetrical metallic cross strips and a dielectric layer on top of a metallic ground plane.The dual-band absorption effect was realized by the the coupling between the unit cells.The dual-band absorption effect was confirmed by the simulation results.The absorption peak frequency of the fundamental mode resonance can be further adjusted by modifying the distance between the unit cell,the thickness of dielectric layer and the symmetry of the cross stripe,according to the simulated results.Moreover,this metamaterial absorber demonstrates high sensitivity to the change of refractive index of the gas,which makes it promising for gas sensing applications.
引文
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[35]Huang L,Chowdhury D R,Ramani S,et al.Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorbers[J].Applied Physics Letters,2012,101(10):101102.
[2]Smith D R,Pendry J B,Wiltshire M C.Metamaterials and negative refractive index [J].Science,2004,305(5685):788-792.
[3]Shalaev V M.Optical negative-index metamaterials [J].Nature Photonics,2007,1(1):41-48.
[4]Pendry J B.Negative refraction makes a perfect lens [J].Physical Review Letters,2000,85(18):3966.
[5]Fang N,Lee H,Sun C,et al.Sub-diffraction-limited optical imaging with a silver superlens [J].Science,2005,308(5721):534-537.
[6]Taubner T,Korobkin D,Urzhumov Y,et al.Near-field microscopy through a SiCsuperlens [J].Science,2006,313(5793):1595.
[7]Schurig D,Mock J J,Justice B J,et al.Metamaterial electromagnetic cloak at microwave frequencies [J].Science,2006,314(5801):977-980.
[8]Ergin T,Stenger N,Brenner P,et al.Three-dimensional invisibility cloak at optical wavelengths [J].Science,2010,328(5976):337-339.
[9]Landy N I,Sajuyigbe S,Mock J,et al.Perfect metamaterial absorber [J].Physical Review Letters,2008,100(20):207402.
[10]Liu N,Mesch M,Weiss T,et al.Infrared perfect absorber and its application as plasmonic sensor [J].Nano Letters,2010,10(7):2342-2348.
[11]Li Z,Butun S,Aydin K.Ultranarrow band absorbers based on surface lattice resonances in nanostructured metal surfaces [J].ACS Nano,2014,8(8):8242-8248.
[12]Shchegolkov D Y,Azad A,O'hara J,et al.Perfect subwavelength fishnetlike metamaterial-based film terahertz absorbers [J].Physical Review B,2010,82(20):205117.
[13]Chen K,Dao T D,Ishii S,et al.Infrared aluminum metamaterial perfect absorbers for plasmon-enhanced infrared spectroscopy [J].Advanced Functional Materials,2015,25(42):6637-6643.
[14]Jepsen P U,Cooke D G,Koch M.Terahertz spectroscopy and imaging-Modern techniques and applications [J].Laser & Photonics Reviews,2011,5(1):124-166.
[15]Fekete L,Němec H,Kadlec F,et al.Ultrafast carrier dynamics in microcrystalline silicon probed by time-resolved terahertz spectroscopy [J].Physical Review B,2009,79(11):115306.
[16]Aydin K,Ferry V E,Briggs R M,et al.Broadband polarization-independent resonant light absorption using ultrathin plasmonic super absorbers [J].Nature Communications,2011,2:1528.
[17]Hao J,Wang J,Liu X,et al.High performance optical absorber based on a plasmonic metamaterial [J].Applied Physics Letters,2010,96(25):251104.
[18]Tao H,Bingham C M,Strikwer A C,et al.Highly flexible wide angle of incidence terahertz metamaterial absorber:design,fabrication,and characterization [J].Physical Review B,2008,78(24):241103.
[19]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.
[20]Ma Y,Chen Q,Grant J,et al.A terahertz polarization insensitive dual band metamaterial absorber [J].Optics Letters,2011,36(6):945-947.
[21]Cui Y X,Xu J,Hung F,et al.A thin film broadband absorber based on multi-sized nanoantennas [J].Applied Physics Letters,2011,99(25):253101.
[22]Shen X P,Yang Y,Zang Y Z,et al.Triple-band terahertz metamaterial absorber:design,experiment,and physical interpretation [J].Applied Physics Letters,2012,101(15):154102.
[23]Wang G Z,Wang B X.Five-band terahertz metamaterial absorber based on a four-gap comb resonator [J].Journal of Lightwave Technology,2015,33(24):5151-5156.
[24]Huang C,Yang H,Yu S,et al.Triple-band polarization-insensitive wide-angle ultra-thin planar spiral metamaterial absorber [J].Journal of Applied Physics,2013,113(21):213516.
[25]Liu X,Tyler T,Starr T,et al.Taming the blackbody with infrared metamaterials as selective thermal emitters [J].Physical Review Letters,2011,107(4):045901.
[26]Dayal G,Ramakrishna S A.Design of multi-band metamaterial perfect absorbers with stacked metal-dielectric disks [J].Journal of Optics,2013,15(5):055106.
[27]Wang B X,Wang G Z,Sang T.Simple design of novel triple-band terahertz metamaterial absorber for sensing application [J].Journal of Physics D:Applied Physics,2016,49(16):165307.
[28]Wang B X,Zhai X,Wang G Z,et al.A novel dual-band terahertz metamaterial absorber for a sensor application [J].Journal of Applied Physics,2015,117(1):014504.
[29]Huang L,Chowdhury D R,Ramani S,et al.Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorbers[J].Applied Physics Letters,2012,101(10):101102.
[30]Grant J,Ma Y,Saha S,et al.Polarization insensitive terahertz metamaterial absorber [J].Optics Letters,2011,36(8):1524-1526.
[31]Zhang S,Fan W,Panoiu N,et al.Experimental demonstration of near-infrared negative-index metamaterials [J].Physical Review Letters,2005,95(13):137404.
[32]Shalaev V M.Negative index of refraction in optical metamaterials [J].Optics Letters,2005,30(24):3356-3358.
[33]Sievenpiper D,Zhang L,Broas R F,et al.High-impedance electromagnetic surfaces with a forbidden frequency band [J].IEEE Transactions on Microwave Theory and Techniques,1999,47(11):2059-2074.
[34]Chen H T.Interference theory of metamaterial perfect absorbers[J].Optics Express,2012,20(7):7165.
[35]Huang L,Chowdhury D R,Ramani S,et al.Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorbers[J].Applied Physics Letters,2012,101(10):101102.