金纳米环双体尺寸和耦合效应对表面等离子体共振特性的影响

孙中华; 王红艳; 王辉; 张志东; 张中月

doi:10.7498/aps.61.125202

摘要

采用离散偶极子近似方法系统地研究了金纳米环双体的消光光谱及其电场分布. 计算结果表明, 金纳米环双体在耦合作用下的共振消光峰对应着不同振动模式, 改变金纳米环双体的排列方式、间距和尺寸大小, 其表面等离子体共振消光峰发生红移或蓝移. 因此可以通过对金纳米环双体结构参数和排列方式的设定, 调节其表面等离子体共振消光峰的位置. 电场分布表明, 水平排列的金纳米环双体较单个金纳米环产生更强的局部表面增强电场. 适当的小间距, 较大的内外半径的金纳米环水平阵列更适合做表面增强拉曼散射的衬底, 在生物分子检测等领域具有潜在的应用.

关键词:

Abstract

The extinction spectra and the electric field distribution of the surface plasmon coupling of gold nanoring dimer in horizontal and vertical arrangements are calculated by the discrete dipole approximation method. It is found that the peaks of extinction spectra and electric field distribution of the surface plasmon coupling are sensitive to the size and the separation gap between gold nanorings. It is demonstrated that the peaks of extinction spectra will be red-shifted or blue-shifted due to the different structure parameters of gold nanorings. Because of the effect of the polarization charge coupling between adjacent gold nanoring, the local electric field distribution is found to be stronger for the gold nanoring dimer and trimer in horizontal arrangement than for the single gold nanoring. The horizontal gold nanoring trimer has stronger enhancement of local electric field than the dimer. It shows that the greater separation gap has the weaker local electric field distribution for the gold nanoring dimer and trimer in horizontal arrangement. Therefore the gold nanoring horizontal array is predicted to be an ideal surface enhanced Raman scattering substrate and is expected to have potential applications in biological and chemical detections.

Keywords:

作者及机构信息

1.
西南交通大学物理科学与技术学院, 成都 610031;

2.
西南大学物理科学与技术学院, 重庆 400715

基金项目: 国家自然科学基金(批准号: 10974161, 11174237, 11004160), 中央高校基本科研业务费专项基金(批准号: SWJTU09CX079, 2010ZT06, XDJK2009C078)和优秀学生资助项目(批准号: 2010XS45)资助的课题.

Authors and contacts

1.
School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China;

2.
School of Physical Science and Technology, Southwest University, Chongqing 400715, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 10974161, 11174237 and 11004160), the Fundamental Research Funds for the Central Universities (Grant Nos. SWJTU09CX079, 2010ZT06 and XDJK2009C078), and the Outstanding Student aid Programs (Grant No. 2010XS45).

参考文献

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[15]	Zhao L L, Kelly K L, Schatz G C 2003 J. Phys. Chem. B 107 7343
[16]	Teo S L, Lin V K, Marty R, Large N, Llado E A, Arbouet A, Girard C, Aizpurua J, Tripathy S, Mlayah A 2010 Opt. Express 18 22271
[17]	Banaee M G, Crozier K B. 2010 Opt. Lett. 35 760
[18]	Purcell E M, Pennypacker C R 1973 Astrophys. J. 186 705
[19]	Draine B T, Flatau P J 2008 J. Opt. Soc. Am. A 25 2693
[20]	Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
[21]	Jain P K, Huang W, El-Sayed M A 2007 Nano Lett. 7 2080
[22]	Rechberger W, Hohenau A, Leitner A, Krenn J R, Lamprecht B, Aussenegg F R 2003 Opt. Commun. 220 137
[23]	Jain P K, El-Sayed M A 2010 Chem. Phys. Lett. 487 153
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[25]	Prodan E, Radloff C, Halas N J, Nordlander P 2003 Science 302 419
[26]	Aizpurua J, Hanarp P, Sutherland D S, Käll M, Bryant G W, Abajo F J G D 2003 Phys. Rev. Lett. 90 5

施引文献

[1]	Liz-Marzán LM 2006 Langmuir 22 32
[2]	Tian Z Q, Ren B, Wu D Y 2002 J. Phys. Chem. B 106 9463
[3]	Campion A, Kambhampati P 1998 Chem. Soc. Rev. 27 241
[4]	Zhang Z Y, Zhao Y P 2007 J. Appl. Phys. 102 113308
[5]	Mo D, Liu J, Duan J L, Yao H J, Hou M D, Sun Y M, Chen Y F, Xue Z H, Zhang L 2009 Acta Phys. Sin. 58 2599 (in Chinese) [莫丹, 刘杰, 段敬来, 姚会军, 侯明东, 孙友梅, 陈艳峰, 薛智浩, 张苓 2009 58 2599]
[6]	Wu D J, Xu X D, Liu X J 2008 Solid State Commun. 146 7
[7]	Li X L, Zhang Z D, Wang H Y, Xiong Z H, Zhang Z Y 2011 Acta Phys. Sin. 60 047807 (in Chinese) [李雪莲, 张志东, 王红艳, 熊祖洪, 张中月 2011 60 047807]
[8]	Zhao S, Yin J B, Zhao X P 2010 Acta Phys. Sin. 59 3302 (in Chinese) [赵晟, 尹剑波, 赵晓鹏 2010 59 3302]
[9]	Barbillon G, Bijeon J L, Plain J, Royer P 2009 Thin Solid Films. 517 2997
[10]	Li S, Zhong M L, Zhang L J, Xiong Z H, Zhang Z Y 2011 Acta Phys. Sin. 60 087806 (in Chinese) [李山, 钟明亮, 张礼杰, 熊祖洪, 张中月 2011 60 087806]
[11]	Zhang Z Y, Xiong Z H 2010 Scientia Sinica Phys Mech & Astron 40 330 (in Chinese) [张中月, 熊祖洪 2010 中国科学: 物理学力学天文学 40 330]
[12]	Sun Z H, Wang H Y, Zhang Z D, Zhang Z Y, Y 2011 Acta Phys. Sin. 60 047808 (in Chinese) [孙中华, 王红艳, 张志东, 张中月 2011 60 047808]
[13]	Liu Y J, Zhang Z Y, Zhao Y P 2008 Appl. Phys. Lett. 93 173106
[14]	Su K H, Wei Q H, Zhang X, Mock J J, Smith D R, Schultz S 2003 Nano Lett. 3 1087
[15]	Zhao L L, Kelly K L, Schatz G C 2003 J. Phys. Chem. B 107 7343
[16]	Teo S L, Lin V K, Marty R, Large N, Llado E A, Arbouet A, Girard C, Aizpurua J, Tripathy S, Mlayah A 2010 Opt. Express 18 22271
[17]	Banaee M G, Crozier K B. 2010 Opt. Lett. 35 760
[18]	Purcell E M, Pennypacker C R 1973 Astrophys. J. 186 705
[19]	Draine B T, Flatau P J 2008 J. Opt. Soc. Am. A 25 2693
[20]	Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
[21]	Jain P K, Huang W, El-Sayed M A 2007 Nano Lett. 7 2080
[22]	Rechberger W, Hohenau A, Leitner A, Krenn J R, Lamprecht B, Aussenegg F R 2003 Opt. Commun. 220 137
[23]	Jain P K, El-Sayed M A 2010 Chem. Phys. Lett. 487 153
[24]	Gunnarsson L, Rindzevicius T, Prikulis J, Kasemo B, Käll M, Zou S L, Schatz G C 2005 J. Phys. Chem. B 109 1079
[25]	Prodan E, Radloff C, Halas N J, Nordlander P 2003 Science 302 419
[26]	Aizpurua J, Hanarp P, Sutherland D S, Käll M, Bryant G W, Abajo F J G D 2003 Phys. Rev. Lett. 90 5

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