CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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 |
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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.
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Received: 10 August 2012
Revised: 08 November 2012
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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78.68.+m
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(Optical properties of surfaces)
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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Fund: 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). |
Corresponding Authors:
Li Hong-Jian
E-mail: lihj398@yahoo.com.cn
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Cite this article:
Wu Cai-Ni (吴彩妮), Li Hong-Jian (李宏建), Peng Xiao (彭校), Cao Guang-Tao (曹广涛), Liu Zhi-Min (刘志敏) Effects of a bar on optical transmission through Z-shaped metallic slit arrays 2013 Chin. Phys. B 22 057301
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