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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 |
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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.
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Received: 13 October 2010
Revised: 12 November 2010
Accepted manuscript online:
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PACS:
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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| Fund: 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). |
Cite this article:
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 2011 Chin. Phys. B 20 037303
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