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Tunable multiple plasmon resonances and local field enhancement of nanocrescent/nanoring structure |
Wang Bin-Bing (王彬兵)a, Zhou Jun (周骏)a, Chen Dong (陈栋)a, Fang Yun-Tuan (方云团)b, Chen Ming-Yang (陈明阳)c |
a Institute of Photonics, Faculty of Science, Ningbo University, Ningbo 315211, China; b School of Computer Science and Telecommunication Engineering, Jiangsu University, Zhenjiang 212013, China; c School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
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Abstract According to the plasmon hybridization theory, the plasmon resonance characteristics of the gold nanocrescent/nanoring (NCNR) structure are systematically investigated by the finite element method. It is found that the extinction spectra of NCNR structure exhibit multiple plasmon resonance peaks, which could be attributed to the result of the plasmon couplings between the multipolar plasmon modes of nanocrescent and the dipolar, quadrupolar, hexapolar, octupolar, decapolar plasmon modes of nanoring. By changing the geometric parameters, the intense and separate multiple plasmon resonance peaks are obtained and can be tuned in a wide wavelength range. It is further found that the plasmon coupling induces giant multipole electric field enhancements around the tips of the nanocrescent. The tunable and intense multiple plasmon resonances of NCNR structure may provide effective applications in multiplex biological sensing.
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Received: 20 January 2015
Revised: 02 March 2015
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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52.35.Mw
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(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
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87.85.fk
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(Biosensors)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61275153 and 61320106014), the Natural Science Foundation of Zhejiang Province, China (Grant No. LY12A04002), the Natural Science Foundation of Ningbo City, China (Grant Nos. 2010D10018 and 2012A610107), and the K. C. Wong Magna Foundation of Ningbo University, China. |
Corresponding Authors:
Zhou Jun
E-mail: zhoujun@nbu.edu.cn
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Cite this article:
Wang Bin-Bing (王彬兵), Zhou Jun (周骏), Chen Dong (陈栋), Fang Yun-Tuan (方云团), Chen Ming-Yang (陈明阳) Tunable multiple plasmon resonances and local field enhancement of nanocrescent/nanoring structure 2015 Chin. Phys. B 24 087301
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