金纳米球壳对的局域表面等离激元共振特性分析

邹伟博; 周骏; 金理; 张昊鹏

doi:10.7498/aps.61.097805

摘要

应用有限元方法, 研究金纳米球壳对的几何结构参数及物理参量对其表面等离激元共振的散射及消光光谱的影响, 并根据等离激元杂化理论进行了理论分析. 结果表明, 随着金壳厚度的增加, 金纳米球壳对的散射及消光共振峰先发生蓝移而后红移, 而随着金纳米球壳间隙的减小, 或者随着金纳米球壳的内核尺寸或内核介质折射率的增大, 散射及消光共振峰均发生红移; 随着金壳厚度或内核尺寸减小, 或者随着内核介质折射率增大, 金纳米球壳对的散射与消光共振强度减弱, 而随着金壳间隙的减小, 金纳米球壳对的散射共振强度先增强后减弱, 而消光共振强度逐渐增强, 数值模拟与理论分析一致.

关键词:

Abstract

The characteristics of scatting and extinction spectra of gold nanoshell pairs, dependent on the its geometry and physical parameters, are investigated by the Finite Element Method based on the plasmon hybridization theory. The numerical results indicate that the resonante peaks in the scattering spectra and the extinction spectra emerge from blue-shift to red-shift with the increases of the thickness of gold nanoshells, whereas they present the red-shift with the decrease of the interparticle separation or with the increases of the size and the refractive index of inner core of gold nanoshells. In the same time, for the case of decreasing the inner core size and the shell thickness or increasing the refractive index of inner core, the intensity of the scattering resonance and the extinction resonance decrease. And, with the decrease of the interparticle separation, the intensity of the scattering resonance of gold nanoshell pairs trends to first increase and then decrease, while the intensity of the extinction resonance increases gradually. All the above is in agreement with the analysis of the plasmon hybridization theory.

Keywords:

作者及机构信息

1.
宁波大学理学院物理系, 宁波 315211

基金项目: 国家自然科学基金(批准号: 60977048), 宁波市国际科技合作计划(批准号: 2010D10018), 浙江省重中之重学科开放基金(批准号: xkzl1012, xkzl1208), 浙江省研究生创新科研项目(YK2009046) 和宁波大学王宽成幸福基金资助的课题.

Authors and contacts

1.
Institute of Optics and Optoelectronics, Ningbo University, Ningbo 315211, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 60977048), the International Collaboration Program of Ningbo (Grant No. 2010D10018), the Project of Key Subject of Zhejiang (Grant Nos. xkzl1012, xkzl1208), the graduate innovative research project of Zhejiang (Grant No. YK2009046), and the K. C. Wong Magna Foundation of Ningbo University, China.

参考文献

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施引文献

[1]	Kelly K L, Coronado E, Zhao L L, Schatz G C 2003 J. Phys. Chem. B 107 668
[2]	Link S, El-Sayed M A 1999 J. Phys. Chem. B 103 8410
[3]	Jain P K, El-Sayed M A 2007 Phys. Chem. C Lett. 111 17451
[4]	Cao M, Wang M, Gu N 2009 J. Phys. Chem. C 113 1217
[5]	Talley C E, Jackson J B, Oubre C, Grady N K, Hollars C W, Lane S M, Huser T R, Nordlander P, Halas N J 2005 Nano. Lett. 5 1569
[6]	Zhang H X, Gu Y, Gong Q H 2008 Chin. Phys. B 17 2567
[7]	Zhou J, Zhang X Y, Yonzon C R, Haes A J, Van Duyne R P 2006 Nanomedicine 1 219
[8]	Larsson E M, Alegret J, Kall M, Sutherland D S 2007 Nano. Lett. 7 1256
[9]	Haes A J, Hall W P, Chang L, Klein W L, Van Duyen R P 2004 Nano. Lett 4 1029
[10]	Zhou S, Honma HSI, Komiyama H 1994 Phys. Rev. B 50 12052
[11]	Nehi C L, Grady N K, Goodrich G P, Tam F, Halas N J, Hafner J H 2004 Nano. Lett. 4 2355
[12]	Prodan E, Radloff C, Halas N J, Nordlander P 2003 Science 302 419
[13]	Wu D J, Liu X J 2008 Acta Phys. Sin. 57 5138 (in Chinese) [吴大建, 刘晓峻 2008 物理学报 57 5138]
[14]	Brandl D W, Oubre C, Nordlander P 2005 J. Chem. Phys. 123 024701
[15]	Lassiter J B, Aizpurua J, Hernandez L I, Brandl D W, Romero I, Lal S, Hafner J H, Nordlander P, Halas N J 2008 Nano Lett. 8 1212
[16]	Khoury C G, Norton S J, Vo-Dinh T 2009 ACS Nano 3 2776
[17]	Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
[18]	Prodan E, Nordlander P 2004 J. Chem. Phys. 120 5444
[19]	Wu D J, Liu X J 2009 Appl. Phys. B 97 193
[20]	Nordlander P, Oubre C 2004 Nano. Lett. 4 899
[21]	Knight M W, Halas N J 2008 New J. Phys. 10 105006
[22]	Stratton J 1941 Electromagnetic Theory (New York: McGraw-Hill)
[23]	Grady N K, Halas N J, Nordlander P 2004 Chem. Phys. Lett. 399 167
[24]	Zuloaga J, Prodan E, Nordlander P 2009 Nano. Lett. 9 887
[25]	Prodan E, Lee A, Nordlander P 2002 Chem. Phys. Lett. 360 325

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