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4 May 2007 Directive emission from a single subwavelength aperture in a periodically corrugated silver film
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Abstract
We present here an algorithm to evaluate the field in the near zone produced by a finite-size electromagnetic source in a periodic structure, referred to as the array scanning method (ASM) - FDTD method. Using a frequency-dependent silver permittivity model, obtained from measurement at optical and infrared frequencies, we implemented the corresponding modeling equations in the ASM-FDTD algorithm using the Z-transform technique. The developed algorithm is applied to the study of the enhanced radiation of a magnetic line source in a corrugated silver film, and the results indicate that the enhancement is due to the excitation of a leaky mode. We also show that other waves may be excited by the source depending on its location, and how this affects the radiation pattern.
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Filippo Capolino, Rui Qiang, David R. Jackson, and Ji Chen "Directive emission from a single subwavelength aperture in a periodically corrugated silver film", Proc. SPIE 6581, Metamaterials II, 65810E (4 May 2007); https://doi.org/10.1117/12.725948
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