Enhanced optical transmission of non-coaxial double-layer gold nano-slit with slanted sidewall arrays |
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| Authors: | Xin Zhou Hongjian Li Zhimin Liu Suxia Xie Haiqing Xu Xiao Peng |
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| Institution: | 1. College of Physics Science and Technology, Central South University, Changsha 410083, PR China;2. College of Materials Science and Engineering, Central South University, Changsha 410083, PR China;3. School of Sciences, Hunan University of Technology, Zhuzhou 412008, PR China;1. Department of Physics, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China;3. Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China;1. Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA;2. Department of Physics, University of Peradeniya, Peradeniya, Sri Lanka;3. Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany;1. Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA;2. Helmholtz-Zentrum Berlin fur Materialien und Energie, D-14109 Berlin, Germany;1. Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), F-14000 Caen, France;2. Missouri University of Science and Technology, Rolla, MO 65409, USA;3. Institute for Nuclear Research, Hungarian Academy of Sciences (ATOMKI), P.O. Box 51, H-4026 Debrecen, Hungary |
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| Abstract: | We present the numerical investigation of the optical transmission through the non-coaxial double-layer gold nano-slit with slanted sidewall arrays by using the finite-difference time-domain (FDTD) method. It is found that there mainly exist three resonant peaks in the transmission spectra and the transmission behaviors are strongly dependent on the lateral displacement, the slit widths, the layer separation and the thickness of the film. Based on the field distribution, we show that the two short wavelength transmission peaks are characterized as the surface plasmon resonance, while the long wavelength transmission peak is characterized as the localized waveguide resonance. |
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