多谐振U形缝隙纳米天线设计及吸收特性
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摘要
太阳能收集是解决无线传感器网络能量受限的有效手段。针对传统采用光伏电池收集太阳能的方法易受环境与光照时间限制、吸收波段窄等问题,提出了一种耦合对称U形缝隙的多谐振纳米天线阵列用于太阳能收集。该天线的单元结构是在银介质基板上刻蚀4个对称的U形缝隙,U形缝隙附近产生的表面等离激元相互耦合,使其在宽波段内产生多个谐振点,从而提高宽波段的平均吸收率。利用时域有限差分方法分析了多谐振U形缝隙纳米天线阵列的吸收特性。仿真结果表明,天线阵列在400~870nm,960~1 100nm两个波段内吸收率较高,并出现多个吸收峰,吸收峰值最大可以达到99%。
Solar collection is an effective mean to solve the problem that network energy of wireless sensor is limited.A multi-resonant nano-antenna array of coupling and symmetric U-shaped slots was proposed for solar collection,aiming at problems such as that solar collection of traditional photovoltaic battery was easily limited by environment and illumination time as well as problem of narrow absorption bands.4 symmetric U-shaped slots were etched in silver dielectric substrate to obtain this antenna unit structure,and then the mutual coupling of surface plasmons produced in the vicinity of Ushaped slots to generate many resonance points in broadband,thus increasing average absorptivity of broadband.Absorption feature of nano-antenna array of multi-resonant U-shaped slots was analyzed through finite difference time domain method.Simulation result indicates that absorptivity of antenna array is higher in two bands of 400~870nm and 960~1 100 nm,and there are many absorption peaks.Absorption value can reach 99% maximally.
Solar collection is an effective mean to solve the problem that network energy of wireless sensor is limited.A multi-resonant nano-antenna array of coupling and symmetric U-shaped slots was proposed for solar collection,aiming at problems such as that solar collection of traditional photovoltaic battery was easily limited by environment and illumination time as well as problem of narrow absorption bands.4 symmetric U-shaped slots were etched in silver dielectric substrate to obtain this antenna unit structure,and then the mutual coupling of surface plasmons produced in the vicinity of Ushaped slots to generate many resonance points in broadband,thus increasing average absorptivity of broadband.Absorption feature of nano-antenna array of multi-resonant U-shaped slots was analyzed through finite difference time domain method.Simulation result indicates that absorptivity of antenna array is higher in two bands of 400~870nm and 960~1 100 nm,and there are many absorption peaks.Absorption value can reach 99% maximally.
引文
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[2]BARNES W L,DEREUX A,EBBESEN T W.Surface plasmon subwavelength optics[J].Nature,2003,424(6950):824.
[3]梁秋群.金属纳米结构表面等离激元杂化和吸收特性的研究[D].北京:中国科学院大学,2015.LIANG Q Q.Study on plasmon hybridization and optical absorption properties of metallic nanostructures[D].Beijing:University of Chinese Academy of Sciences,2015.(in Chinese)
[4]黄强,王敏,李昂,等.对称型长程表面等离子体共振分析系统[J].光学精密工程,2014,22(1):44-49.HUANG Q,WANG M,LI A,et al..Symmetrical long range surface plasmon resonance sensing system[J].Opt.Precision Eng.,2014,22(1):44-49.(in Chinese)
[5]EIZNER E,AVAYU O,DITCOVSKI R,et al..Aluminum nanoantenna complexes for strong coupling between excitons and localized surface plasmons[J].Nano Letters,2015,15(9):6215-21.
[6]熊尚,罗雪丰,韩立.纯金膜表面等离子增强的旋光效应[J].光学精密工程,2012,20(7):1525-1531.XIONG SH,LUO X F,HAN L.Plasmon enhanced magneto-optical effect on surface of pure gold film[J].Opt.Precision Eng.,2012,20(7):1525-1531.(in Chinese)
[7]王冰,金杰,侯梓叶.双蝶形金属纳米光天线的远场特性研究[J].激光与光电子学进展,2015(2):183-188.WANG B,JIN J.HOU Z Y.Far field characteristics of butterfly shaped metal nano optical antenna[J].Laser&Optoelectronics Progress,2015(2):183-188.(in Chinese)
[8]李宏光.银纳米圆盘光天线的远场方向性研究[J].光子学报,2012,41(8):977-981.LI H G.Far-field characteristics of silver nanodisk optical antenna[J].Guangzi Xuebao/acta Photonica Sinica,2012,41(8):977-981.(in Chinese)
[9]El-TOUKHY Y M,HUSSEIN M,HAMEED M F,et al..Optimized tapered dipole nanoantenna as efficient energy harvester[J].Optics Express,2016,24(14):A1107-A1122.
[10]PATEL S K,ARGYROPOULOS C.Plasmonic nanoantennas:enhancing light-matter interactions at the nanoscale[J].EPJ Appl.Metamat,,2015,21(4):1-15.
[11]杨盈莹,张永亮,赵震声,等.双金属纳米天线在少周期激光中的宽带超快电磁响应[J].物理学报,2012,61(1):14207-014207.YANG Y Y,ZHANG Y L,ZHAO ZH SH,et al..Broad-bandwidth and ultrafast electromagnetic response of coupled bimetal nanoantennas in few-cycle laser applications[J].Acta Physica Sinica,2012,61(1):014207.(in Chinese)
[12]郝爱文,程龙,李新,等.等臂L形银纳米天线的表面等离子特性研究[J].电子科技,2014,27(1):74-77.HAO A W,CHENG L,LI X,et al..Plasma surface characteristics investigation of the Lshaped silver nano-antenna with equal arms[J].Electronic Science and Technology,2014,27(1):74-77.(in Chinese)
[13]ZARRABI F B.Sub wavelength plasmonic nanoantenna with H and U shape for enhancement of multi resonance[J].Optik-International Journal for Light and Electron Optics,2016,127(10):4490-4494.
[14]ZHANG J,ZHANG W,ZHU X,et al..Resonant slot nanoantennas for surface plasmon radiation in optical frequency range[J].Applied Physics Letters,2012,100(24):241115.
[15]YANG J,ZHOU S,HU C,et al..Broadband spin-controlled surface plasmon polariton launching and radiation via L-shaped optical slot nanoantennas[J].Laser&Photonics Review,2014,8(4):590-595.
[16]黎永前,郭勇君,苏磊,等.矩形块微纳结构材料在红外波段的偏振光吸收[J].光学精密工程,2014,22(11):2998-3003.LI Y Q,GUO Y J,SU L,et al..Polarization-dependent absorption of rectangular-block metamaterials in infrared region[J].Opt.Precision Eng.,2014,22(11):2998-3003.(in Chinese)
[17]HU D,QI C,XIAO Y H E,et al..Power combining technology in three-way terahertz photoconductive antenna[J].Chinese Journal of Luminescence,2014,35(12):1500-1505.
[18]IIUZ Z,BOAG A.Wideband dual-vivaldi nano-antenna with high radiation efficiency over the infrared frequency band[J].Optics Letters,2011,36(15):2773-2775.
[19]VANDENBOSCH G A E,MA Z.Upper bounds for the solar energy harvesting efficiency of nanoantennas[J].Nano Energy,2012,1(3):494-502.
[20]ONO M,KURAMOCHI E,ZHANG G,et al..Nano wire-nanoantenna coupled system fabricated by nanomanipulation[J].Optics Express,2016,24(8):8647-8659.
[21]王珩.光学纳米天线设计及吸收增强特性研究[D].哈尔滨工业大学,2013.WANG H.Design of optical nanoantennas and Their Optical Absorption Enhancement Properties[D].Harbin Institute of Technology,2013.(in Chinese)
[22]邓燕.入射光偏振对金纳米棒状颗粒光学性质的影响[J].量子电子学报,2010,27(6):732-736.DENG Y.Influence of polarization of light on optical properties of single gold nanorod[J].Chinese Journal of Quantum Electronics,2010,27(6):732-736.(in Chinese)