领结形中空表面等离子体波导的传输特性

贾智鑫; 段欣; 吕婷婷; 郭亚楠; 薛文瑞

doi:10.7498/aps.60.057301

摘要

设计了一种领结形中空表面等离子体波导.采用频域有限差分法,对这种波导所支持的基模的能流密度分布、有效折射率、传播长度和模式面积随几何结构参数和工作波长的依赖关系进行了分析.结果表明,沿纵向的能流主要分布在两个上下突起所形成的中间区域.通过调整几何参数及工作波长,可以调节模式的有效折射率、传播长度和模式面积.在工作波长确定的条件下,有效折射率随突起半径的增大呈减小趋势,而传播长度和模式面积则随着突起半径的增大呈增大趋势,四个角上的圆弧半径对波导的传输特性有微调作用,左右扇形区域的半径对波导的传输特性有较明显

关键词:

Abstract

A kind of surface plasmonic waveguide with a bowtie shaped air core was designed. The dependence of distribution of longitudinal energy flux density, effective index and propagation length of the fundamental mode supported by this waveguide on geometrical parameters and working wavelength were analyzed using the finite-difference frequency-domain (FDFD) method. Results show that the longitudinal energy flux density distributes mainly in the center region which is formed by the top and the bottom ridge. The effective index and propagation length of the fundamental mode can be adjusted by the geometric parameters as well as the working wavelength. At a given working wavelength, the effective index decreases as the radius of ridge increases, meanwhile propagation length and mode area of the fundamental mode increase as radius of ridge increases. The geometric parameter of radius of circles at four corner can affect the propagation properties slightly. The radius of sectors on both sides can effect propagation properties obviously. With given geometric parameters, relative to the case of λ=705.0 nm, in the case of larger λ, the area of field distribution is larger, and the size of the contact area of field and metallic surface is also larger, then the interaction of field and silver is weaker, and the effective index becomes smaller, so the propagation length becomes larger. The possibility of applying this kind of surface plasmonic waveguide to the field of sensors was discussed.

Keywords:

作者及机构信息

1.
山西大学物理电子工程学院,太原 030006

基金项目: 国家基础科学人才培养基金(批准号:J0730317)和山西省自然科学基金(批准号:2010011003-1)资助的课题.

Authors and contacts

1.
College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China

参考文献

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施引文献

[1]	Barnes W L , Dereux A, Ebbesen T W 2003 Nature 424 824
[2]	Ozbay E 2006 Science 311 189
[3]	Bozhevolnyi S I, Volkov V S, Devaux E, Laluet J Y, Ebbesen T W 2006 Nature 440 508
[4]	Maier S A 2006 IEEE J. Sel. Topics Quantum Electron. 12 1671
[5]	Economou E N 1969 Phys. Rev. 182 539
[6]	Berini P 1999 Opt. Lett. 24 1011
[7]	Jung J, Sondergaard T, Bozhevolnyi S I 2007 Phys. Rev. B 76 035434
[8]	Guo J, Adato R 2008 Opt. Express 16 1232
[9]	Tanaka K, Tanaka M 2003 Appl. Phys. Lett. 82 1158
[10]	Kusunoki F, Yotsuya T, Takahara J, Kobayashi T 2005 Appl. Phys. Lett. 86 211101
[11]	Gordon R, Brolo A G 2005 Opt. Express 13 1933
[12]	Zhang H X,Gu Y,Gong Q H 2008 Chin. Phys. B 17 2567
[13]	Pile D F P, Ogawa T, Gramotnev D K, Matsuzaki Y, Vernon K C, Yamaguchi K, Okamoto T, Haraguchi M, Fukui M 2005 Appl. Phys. Lett. 87 261114
[14]	Liu L, Han Z, He S, 2005 Opt. Express 13 6645
[15]	Xue W R, Guo Y N, Zhang W M 2009 Chin. Phys. B 18 2529
[16]	Pile D F P, Ogawa T, Gramotnev D K, Okamoto T, Haraguchi M, Fukui M, Matsuo S 2005 Appl. Phys. Lett. 87 061106
[17]	Boltasseva A, Volkov V S, Nielsen R B, Moreno E, Rodrigo S G, Bozhevolnyi S I 2008 Opt. Express 16 5252
[18]	Ogawa T, Pile D F P, Okamoto T, Haraguchi M, Fukui M, Gramotnev D K 2008 J. Appl. Phys. 104 033102
[19]	Lu J Q, Maradudin A A 1990 Phys. Rev. B 42 17 11159
[20]	Chen S L, Shakya J, Lipson M 2006,Opt. Lett. 31 14 2133
[21]	Pile D F P, Gramotnev D K 2004 Opt. Lett. 29 1069
[22]	Lee I, Jung J, Park J, Kim H, Lee B 2007 Opt. Express 15 16596
[23]	Xue W R, Guo Y N, Zhang J, Zhang W M 2009 J. Lightwave Technol 27 2634
[24]	Arbel D, Orenstein M 2008 Opt. Express 16 3114
[25]	Xue W R, Guo Y N, Li P, and Zhang W M 2008 Opt. Express 16 10710
[26]	Guo Y N, Xue W R, Yang R C, Zhang W M 2009 Opt. Express 17 11822
[27]	Guo Y N, Xue W R, Zhang W M 2009 Acta Phys. Sin. 58 4168 (in Chinese)[郭亚楠、薛文瑞、张文梅 2009 58 4168]
[28]	Xue W R, Guo Y N, Zhang W M 2010 Chin. Phys. B 19 017302
[29]	Holmgaard T, Bozhevolnyi S I 2007 Phys. Rev. B 75 245405
[30]	Krasavin A V, Zayats A V 2007 Appl. Phys. Lett. 90 211101
[31]	Steinberger B, Hohenau A, Ditlbacher H, Stepanov A L, Drezet A, Aussenegg F R, Leitner A, Krenn J R 2006 Appl. Phys. Lett. 88 094104
[32]	Quinten M, Leitner A, Krenn J R, Aussenegg F R 1998 Opt. Lett. 23 1331
[33]	Zhang H X, Gu Y, Gong Q H 2008 Chin. Phys. B 17 2567
[34]	Hao P, Wu Y H, Zhang P 2010 Acta Phys. Sin. 59 6532 (in Chinese) [郝鹏、吴一辉、张平 2010 59 6532]
[35]	Wu Y C, Gu Z 2008 Acta Phys. Sin. 57 2295 (in Chinese) [吴英才、顾铮 2008 理学报 57 2295]
[36]	Zhu Z M, Brown T G 2002 Opt. Express 10 853
[37]	Guo S P, Wu F, Albin S, Tai H, Rogowski R S 2004 Opt. Express 12 3341
[38]	Yu C P, Chang H C 2004 Opt. Express 12 6165
[39]	Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
[40]	Weber M J 2002 Handbook of optical materials(New York:CRC Press)p389
[41]	Homola J, Piliarik M 2006 Springer series on chemical sensors and biosensors (Berlin:Springer) 4 p45

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