中国物理B ›› 2020, Vol. 29 ›› Issue (4): 45202-045202.doi: 10.1088/1674-1056/ab75d1

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Tunability of Fano resonance in cylindrical core-shell nanorods

Ben-Li Wang(王本立)   

  1. College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China
  • 收稿日期:2019-12-17 修回日期:2020-01-22 出版日期:2020-04-05 发布日期:2020-04-05
  • 通讯作者: Ben-Li Wang E-mail:wangbenli@mail.buct.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11647021).

Tunability of Fano resonance in cylindrical core-shell nanorods

Ben-Li Wang(王本立)   

  1. College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2019-12-17 Revised:2020-01-22 Online:2020-04-05 Published:2020-04-05
  • Contact: Ben-Li Wang E-mail:wangbenli@mail.buct.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11647021).

摘要: The optical properties of cylindrical core-shell nanorods (CCSNs) are theoretically investigated in this paper. The results show that Fano resonance can be generated in CCSNs, and the wavelength and the intensity at Fano dip can be tuned respectively by adjusting the field coupling of cavity mode inside and near field on gold surface. The high tuning sensitivity which is about 400 nm per refractive-index unit can be obtained, and an easy-to-realize tunable parameter is also proposed. A two-oscillator model is also introduced to describe the generation of Fano resonance in CCSNs, and the results from this model are in good agreement with theoretical results. The CCSNs investigated in this work may have promising applications in optical devices.

关键词: Fano resonance, tunability, local surface plasmon resonance, optical devices

Abstract: The optical properties of cylindrical core-shell nanorods (CCSNs) are theoretically investigated in this paper. The results show that Fano resonance can be generated in CCSNs, and the wavelength and the intensity at Fano dip can be tuned respectively by adjusting the field coupling of cavity mode inside and near field on gold surface. The high tuning sensitivity which is about 400 nm per refractive-index unit can be obtained, and an easy-to-realize tunable parameter is also proposed. A two-oscillator model is also introduced to describe the generation of Fano resonance in CCSNs, and the results from this model are in good agreement with theoretical results. The CCSNs investigated in this work may have promising applications in optical devices.

Key words: Fano resonance, tunability, local surface plasmon resonance, optical devices

中图分类号:  (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))

  • 52.35.Mw
41.20.Jb (Electromagnetic wave propagation; radiowave propagation) 52.25.Tx (Emission, absorption, and scattering of particles)