椭圆截面金纳米管近场增强特性的研究

丛超; 吴大建; 刘晓峻

doi:10.7498/aps.61.047802

摘要

本文基于时域有限差分方法(finite difference time domain, FDTD)研究了入射光波长、入射光偏振方向、纳米管几何形状、管壁厚度及内核和包埋介质的变化对椭圆截面金纳米管近场分布特征的影响. 研究发现, 入射光波长为纳米管等离激元共振波长时, 纳米管近场增强最大; 入射光偏振方向与椭圆长轴夹角的增加会导致管内的场强迅速增大; 椭圆管半短轴变大可以调节纳米管场强分布从两端高、中间低变化为均匀分布; 内核和包埋介质介电常数的增大均会使得纳米管内部及周围场强逐渐减弱.

关键词:

Abstract

The local electric field components of the elliptical gold nanotube are calculated based on the finite difference time domain (FDTD) method. It is find that when the wavelength of the incident light is just at a resonant wavelength, the local field enhancement of the gold nanotube reaches a maximum. The increase of the semiminor axis of the ellipse makes the distribution of the local field change from a distribution that is high in both sides and low in the middle part of the nanotube into a distribution that is uniform around the tube. With the increase of the angle between the incident polarization and the semimajor axis, the local electric field components increase rapidly. The increases of the dielectric constants for both the core and the embedding medium cause the local field around the nanotube to decrease.

Keywords:

作者及机构信息

1.
南京大学物理学院, 南京 210093

基金项目: 国家自然科学基金(批准号: 11104319, 11074124, 10904052), 江苏省自然科学基金(批准号: BF2011592)和江苏高校优势学科建设工程资助的课题.

Authors and contacts

1.
School of Physics, Nanjing University, Nanjing 210093, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11104319, 11074124, 10904052), the Natural Science Foundation of Jiangsu Province (Grant No. BK2011542), and PAPD.

参考文献

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[27]	Wu D J, Liu X J, Li B 2011 J. Appl. Phys. 109 083540
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[31]	Oldenburg S J, Hale G D, Radloff C, Halas N J 1999 Appl. Phys. Lett. 75 1063
[32]	Prodan E, Radloof C, Halas N J, Nordlander P 2003 Science 302 419
[33]	Zhu J 2007 Appl. Phys. A 88 673

施引文献

[1]	Krenn J R, Dereux A, Weeber J C, Bourillot E, Lacroute Y, Goudonnet J P 1999 Phys. Rev. Lett. 82 2590
[2]	Maier S A, Brongersma M L, Kik P G, Meltzer S, Requicha A A G, Atwater H A 2001 Adv. Mater. 13 1501
[3]	Quinten M, Leitner A, Krenn J R, Aussenegg F R 1998 Opt. Lett. 23 1331
[4]	Maier S A, Kik P G, Atwater H A, Meltzer S, Harel E, Koel B E, Requicha A A G 2003 Nat. Mater. 2 229
[5]	Zhang H X, Gu Y, Gong Q H 2008 Chin. Phys. B 17 2567
[6]	Kundu J, Le F, Nordlander P, Halas N J 2008 Chem. Phys. Lett. 452 115
[7]	Neuendorf R, Quinten M, Kreibig U 1996 J. Chem. Phys. 104 6348
[8]	Bohren C F, Huffman D R 1983 Absorption and scattering of light by small particles (New York: Wiley)
[9]	Westcott S L, Jackson J B, Radloff C, Halas N J 2002 Phys. Rev. B 66 155431
[10]	Wu D J, Xu X D, Liu X J 2008 J. Chem. Phys. 129 074711
[11]	Prodan E, Radloof C, Halas N J, Nordlander P 2003 Science 302 419
[12]	Prodan E, Nordlander P, Halas N J 2003 Nano Lett. 3 1411
[13]	Schelm S, Smith G B 2005 J. Phys. Chem. B 109 1689
[14]	Prodan E, Nordlander P 2004 J. Chem. Phys. 120 5444
[15]	Westcott S L, Jackson J B, Radloff C, Halas N J 2002 Phys. Rev. B 66 155431
[16]	Averitt R D, Westcott S L, Halas N J 1999 J. Opt. Soc. Am. B 16 1824
[17]	Averitt R D, Sarkar D, Halas N J 1997 Phys. Rev. Lett. 78 4217
[18]	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]
[19]	Wu D J, Liu X J 2010 Appl. Phys. Lett. 97, 061904
[20]	Wu D J, Liu X J 2010 Appl. Phys. Lett. 96, 151912
[21]	Zhu J, Bai S W, Zhao J W, Li J J 2009 Appl. Phys. A 97 431
[22]	Leveque G, Martin O J F 2006 Opt. Express 14 9971
[23]	Limmer S J, Chou T P, Cao G Z 2003 J. Phys. Chem. B 107 13313
[24]	Mock J J, Oldenburg S J, Smith D R, Schultz D A, Schultz S 2002 Nano Lett. 2 465
[25]	Hendren W R, Murphy A, Evans P, Connor D, Wurtz G A, Zayats A V, Atkinson R, Pollard R J 2008 J. Phys.: Condens. Matter 20 362203
[26]	Cong C, Wu D J, Liu X J 2011 Acta Phys. Sin. 60 046102 (in Chinese) [丛超, 吴大建, 刘晓峻 2011 物理学报 60 046102]
[27]	Wu D J, Liu X J, Li B 2011 J. Appl. Phys. 109 083540
[28]	Mock J J, Hill R T, Degiron A, Zauscher S, Chilkoti A, Smith D R 2008 Nano Lett. 8 2245
[29]	Wei H, Hao F, Huang Y Z, Wang W Z, Nordlander P, Xu H X 2008 Nano Lett. 8 2497
[30]	Brewer S H, Anthireya S J, Lappi S E, Drapcho D L, Franzen S 2002 Langmuir 18 4460
[31]	Oldenburg S J, Hale G D, Radloff C, Halas N J 1999 Appl. Phys. Lett. 75 1063
[32]	Prodan E, Radloof C, Halas N J, Nordlander P 2003 Science 302 419
[33]	Zhu J 2007 Appl. Phys. A 88 673

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