›› 2014, Vol. 23 ›› Issue (8): 87303-087303.doi: 10.1088/1674-1056/23/8/087303

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

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

王彬兵, 周骏, 张昊鹏, 陈金平   

  1. Institute of Photonics, Faculty of Science, Ningbo University, Ningbo 315211, China
  • 收稿日期:2013-11-29 修回日期:2014-02-16 出版日期:2014-08-15 发布日期:2014-08-15
  • 基金资助:
    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.

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

Wang Bin-Bing (王彬兵), Zhou Jun (周骏), Zhang Hao-Peng (张昊鹏), Chen Jin-Ping (陈金平)   

  1. Institute of Photonics, Faculty of Science, Ningbo University, Ningbo 315211, China
  • Received:2013-11-29 Revised:2014-02-16 Online:2014-08-15 Published:2014-08-15
  • Contact: Zhou Jun E-mail:zhoujun@nbu.edu.cn
  • Supported by:
    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.

摘要: 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.

关键词: localized surface plasmon resonance, field enhancement, nanorice, plasmon hybridization

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.

Key words: localized surface plasmon resonance, field enhancement, nanorice, plasmon hybridization

中图分类号:  (Collective excitations)

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