Simultaneous low extinction and high local field enhancement in Ag nanocubes

doi:10.1088/1674-1056/20/3/037303

中国物理B ›› 2011, Vol. 20 ›› Issue (3): 37303-037303.doi: 10.1088/1674-1056/20/3/037303

Simultaneous low extinction and high local field enhancement in Ag nanocubes

周飞¹, 李志远¹, 刘晔²

(1)Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Anhui Provincial Key Lab of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

收稿日期:2010-10-13 修回日期:2010-11-12 出版日期:2011-03-15 发布日期:2011-03-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60736041 and 10874238), and the National Key Basic Research Special Foundation of China (Grant No. 2007CB613205).

Simultaneous low extinction and high local field enhancement in Ag nanocubes

Zhou Fei(周飞)^a), Liu Ye(刘晔)^a)b), and Li Zhi-Yuan(李志远)^a)†

^a Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; ^b Anhui Provincial Key Lab of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

Received:2010-10-13 Revised:2010-11-12 Online:2011-03-15 Published:2011-03-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60736041 and 10874238), and the National Key Basic Research Special Foundation of China (Grant No. 2007CB613205).

摘要/Abstract

摘要： We theoretically investigate surface plasmon resonance properties in Au and Ag cubic nanoparticles and find a novel plasmonic mode that exhibits simultaneous low extinction and high local field enhancement properties. We analyse this mode from different aspects by looking at the distribution patterns of local field intensity, energy flux, absorption and charge density. We find that in the mode the polarized charge is highly densified in a very limited volume around the corner of the nanocube and results in very strong local field enhancement. Perturbations of the incident energy flux and light absorption are also strongly localized in this small volume of the corner region, leading to both low absorption and low scattering cross section. As a result, the extinction is low for the mode. Metal nanoparticles involving such peculiar modes may be useful for constructing nonlinear compound materials with low linear absorption and high nonlinearity.

关键词: surface plasmon resonance, low extinction, local field enhancement

Abstract: We theoretically investigate surface plasmon resonance properties in Au and Ag cubic nanoparticles and find a novel plasmonic mode that exhibits simultaneous low extinction and high local field enhancement properties. We analyse this mode from different aspects by looking at the distribution patterns of local field intensity, energy flux, absorption and charge density. We find that in the mode the polarized charge is highly densified in a very limited volume around the corner of the nanocube and results in very strong local field enhancement. Perturbations of the incident energy flux and light absorption are also strongly localized in this small volume of the corner region, leading to both low absorption and low scattering cross section. As a result, the extinction is low for the mode. Metal nanoparticles involving such peculiar modes may be useful for constructing nonlinear compound materials with low linear absorption and high nonlinearity.

Key words: surface plasmon resonance, low extinction, local field enhancement

中图分类号: (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

73.20.Mf

78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters)

周飞, 刘晔, 李志远. Simultaneous low extinction and high local field enhancement in Ag nanocubes[J]. 中国物理B, 2011, 20(3): 37303-037303.

Zhou Fei(周飞), Liu Ye(刘晔), and Li Zhi-Yuan(李志远). Simultaneous low extinction and high local field enhancement in Ag nanocubes[J]. Chin. Phys. B, 2011, 20(3): 37303-037303.

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Simultaneous low extinction and high local field enhancement in Ag nanocubes

Simultaneous low extinction and high local field enhancement in Ag nanocubes

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