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The Coherence Effect of Surface Plasmons on Optical Transmission in Silver Subwavelength Hole Arrays

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We study the optical transmission through a silver film with subwavelength hole arrays, which is sandwiched by super-thin SiO2 layers. Based on finite-difference time-domain method, optical transmission and dispersion relation of surface plasmons are obtained. It is shown that surface plasmons are coherent in the top layer of the sandwich, which affects optical transmission in this subwavelength system. As a result, transmission modes can be tuned by changing the thickness of top layer. Resonant modes are also demonstrated by the electric field distribution. Besides, anti-resonances induced by Fano interference are also observed in this system. These properties may provide a peculiar approach to manipulate the propagation of electromagnetic wave in subwavelength microstructures.
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Document Type: Research Article

Publication date: February 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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