Fano-like resonance characteristics of asymmetric Fe2O3@Au core/shell nanorice dimer

doi:10.1088/1674-1056/23/8/087303

Abstract A geometrical configuration of Fe₂O₃/Au core-shell nanorice dimer is proposed and its multipolar plasmon Fano-like resonance characteristics are theoretically investigated by generalizing the plasmon hybridization model of individual nanorice to the bright and dark modes of the nanorice dimer. Under the irradiation of polarization light, the extinction spectra of the nanorice dimer are numerically simulated by using the finite element method (FEM). Our studies show that the Fano-like resonance of the nanorice dimer results in an asymmetric line shape of the Fano dip in the extinction spectrum which can be controlled by varying the structure parameters of the nanorice dimer. Meanwhile, there is a giant field enhancement at the gap between the two nanorices on account of the plasmonic coupling in the nanorice dimer. The aforementioned two characteristics of the nanorice dimer are useful for plasmon-induced transparency and localized surface plasmon resonance sensors.

Keywords: localized surface plasmon resonance field enhancement nanorice plasmon hybridization

Received: 29 November 2013
Revised: 16 February 2014
Accepted manuscript online:

PACS:	73.22.Lp	(Collective excitations)
	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

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 International Collaboration Program of the Natural Science Foundation of Ningbo (Grant Nos. 2010D10018 and 2012A610107), K. C. Wong Education Foundation and the K. C. Wong Magna Foundation of Ningbo University, China.

Corresponding Authors: Zhou Jun
E-mail: zhoujun@nbu.edu.cn

Cite this article:

Wang Bin-Bing (王彬兵), Zhou Jun (周骏), Zhang Hao-Peng (张昊鹏), Chen Jin-Ping (陈金平) Fano-like resonance characteristics of asymmetric Fe₂O₃@Au core/shell nanorice dimer 2014 Chin. Phys. B 23 087303

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Fano-like resonance characteristics of asymmetric Fe2O3@Au core/shell nanorice dimer

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Fano-like resonance characteristics of asymmetric Fe₂O₃@Au core/shell nanorice dimer