中国物理B ›› 2013, Vol. 22 ›› Issue (5): 57301-057301.doi: 10.1088/1674-1056/22/5/057301

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

Effects of a bar on optical transmission through Z-shaped metallic slit arrays

吴彩妮a, 李宏建a b, 彭校a, 曹广涛b, 刘志敏a   

  1. a College of Physics and Electronics, Central South University, Changsha 410083, China;
    b College of Materials Science and Engineering, Central South University, Changsha 410083, China
  • 收稿日期:2012-08-10 修回日期:2012-11-08 出版日期:2013-04-01 发布日期:2013-04-01
  • 基金资助:
    Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20100162110068) and the National Natural Science Foundations of China (Grant Nos. 61275174 and 11164007).

Effects of a bar on optical transmission through Z-shaped metallic slit arrays

Wu Cai-Ni (吴彩妮)a, Li Hong-Jian (李宏建)a b, Peng Xiao (彭校)a, Cao Guang-Tao (曹广涛)b, Liu Zhi-Min (刘志敏)a   

  1. a College of Physics and Electronics, Central South University, Changsha 410083, China;
    b College of Materials Science and Engineering, Central South University, Changsha 410083, China
  • Received:2012-08-10 Revised:2012-11-08 Online:2013-04-01 Published:2013-04-01
  • Contact: Li Hong-Jian E-mail:lihj398@yahoo.com.cn
  • Supported by:
    Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20100162110068) and the National Natural Science Foundations of China (Grant Nos. 61275174 and 11164007).

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摘要： We investigate the effects of a bar on optical transmission through Z-shaped metallic slit arrays by using finite-difference time domain (FDTD) method. A new hybrid Fabry-Perot (FP) surface plasmon polariton (SPP) mode emerges when changing the geometric parameters of the bar, and this mode can be viewed as a coupling between FP mode and SPP mode. In addition, an obvious dip appears in a featured area when the bar deviates from the central line, and a small displacement of the bar leads to tremendous change of the dip. These behaviors can be attributed to the phase resonance. In short, the structure is very sensitive to the metal bar. Furthermore, it combines photonic device miniaturization with sensitivity, which is useful for making optical switch.

关键词: surface plasmon resonance, transmission, Z-shaped metallic slit arrays

Abstract: We investigate the effects of a bar on optical transmission through Z-shaped metallic slit arrays by using finite-difference time domain (FDTD) method. A new hybrid Fabry-Perot (FP) surface plasmon polariton (SPP) mode emerges when changing the geometric parameters of the bar, and this mode can be viewed as a coupling between FP mode and SPP mode. In addition, an obvious dip appears in a featured area when the bar deviates from the central line, and a small displacement of the bar leads to tremendous change of the dip. These behaviors can be attributed to the phase resonance. In short, the structure is very sensitive to the metal bar. Furthermore, it combines photonic device miniaturization with sensitivity, which is useful for making optical switch.

Key words: surface plasmon resonance, transmission, Z-shaped metallic slit arrays

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
78.68.+m (Optical properties of surfaces) 75.70.-i (Magnetic properties of thin films, surfaces, and interfaces)