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Optical transmission through an interface between subwavelength slits
Authors:Li-li Tian  Huai-Yu Wang  Yun-Song Zhou
Institution:1. Center for Theoretical Physics, Department of Physics, Capital Normal University, China;2. Department of Physics, Tsinghua University, China
Abstract:This paper studies optical transmission through an interface between two slits with different widths in a sheet composed of an ideal conductor. Such a structure is of potential use in fabricating optical diode and may be the simplest one compared to other designs. Our calculations show that there is a critical wavelength. When the light wavelength is below the critical wavelength, the transmissivity is unidirectional. The expression of the stable transmissivity as a function of the ratio of the widths of the two slits was obtained analytically. Particularly, at the critical wavelength, the transmissivities are zero. This phenomenon has great potential for application in the manufacture of wavelength blockers.
Keywords:Photodiodes(230  5170)  Waveguides(230  7400)  Surface plasmons(240  6680)  Metal optics(260  3910)  Guided waves(310  279)
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