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 language | English |
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Pages (from-to) | 4988-4991 |
Number of pages | 4 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 8 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2008 |
Keywords
- Diffraction
- Nano
- Photonics
- Polarization
- Slit