Journal of the Optical Society of Korea

  • 제15권2호
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  • Pages.196-201
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  • 2011
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  • 1226-4776(pISSN)
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  • 2093-6885(eISSN)
한국광학회 (Optical Society of Korea)
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Near-field Characterization on Light Emanated from Subwavelength Plasmonic Double Slit of Finite Length

  • Kim, Ki-Young (Department of Physics, National Cheng Kung University) ;
  • Goncharenko, Anatoliy V. (Department of Physics, National Cheng Kung University) ;
  • Hong, Jian-Shiung (Institute of Electro-Optical Science and Engineering, National Cheng Kung University) ;
  • Chen, Kuan-Ren (Department of Physics, National Cheng Kung University)
  • 투고 : 2011.02.15
  • 심사 : 2011.05.27
  • 발행 : 2011.06.25
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초록

Near-field properties of light emanated from a subwavelength double slit of finite length in a thin metal film, which is essential for understanding fundamental physical mechanisms for near-field optical beam manipulations and various potential nanophotonic device applications, is investigated by using a three-dimensional finite-difference time-domain method. Near-field intensity distribution along the propagation direction of light after passing through the slit has been obtained from the phase relation of transverse electric and magnetic fields and the wave impedance. It is found that the near field of emerged light from the both slits is evanescent, that is consistent with conventional surface plasmon localization near the metal surface. Due to the finite of the slit, the amplitude of this evanescent field does not monotonically approach to than of the infinite slit as the slit length increases, i.e. the near-field of the longer slit along the center line can be weaker than that of the shorter one.

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피인용 문헌

  1. Beam focusing from double subwavelength metallic slits filled with nonlinear material surrounded by dielectric surface gratings vol.10, pp.4, 2012, https://doi.org/10.1016/j.photonics.2012.05.002
  2. Polarization dependent transmission through a sub-wavelength hexagonal aperture surrounded by segmented polygonal grooves vol.21, pp.26, 2013, https://doi.org/10.1364/OE.21.032668
  3. Beam focusing from double subwavelength slits surrounded by Ag/SiO 2 /Ag tri-layer gratings vol.381, 2016, https://doi.org/10.1016/j.optcom.2016.06.062
  4. Complex Mechanism of Enhanced Optical Transmission Through a Composite Coaxial/Circular Aperture vol.7, pp.3, 2012, https://doi.org/10.1007/s11468-011-9323-3