Analysis of polarization dependence of a nano-slit using finite-difference-time-domain method

Baek Woon Lee, Young Gu Ju

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We analyzed the polarization dependent behavior of a nano-slit using a quasi-periodic finite-difference-time-domain (FDTD). In the simulation, the transmission decreases nearly to zero when the polarization is parallel to a slit, and the slit is narrower than a half wavelength. On the other hand, transmission of polarization perpendicular to the slit produces monotonic decrease with a decrease of the slit width. The polarization discrimination can be attributed to the different boundary conditions for two polarizations. According to a derived simple formula, the parallel polarization decays exponentially with the thickness of the slit when the width is smaller than a half wavelength. The exponential decay is verified by the simulation. In addition, the calculated transmission of aluminum nano-slit has a similar polarization behavior to that of a dielectric nano-slit.

Original languageEnglish
Pages (from-to)4988-4991
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume8
Issue number10
DOIs
StatePublished - Oct 2008

Keywords

  • Diffraction
  • Nano
  • Photonics
  • Polarization
  • Slit

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