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Effect of finite metallic grating size on Rayleigh anomaly-surface plasmon polariton resonances

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Abstract
  • Rayleigh anomalies (RAs) and surface plasmon polaritons (SPPs) on subwavelength metallic gratings play pivotal roles in many interesting phenomena such as extraordinary optical transmission. In this work, we present a theoretical analysis of the effect of finite metallic grating size on RA-SPP resonances based on the combination of rigorous coupled wave analysis and finite aperture diffraction. One-dimensional arrays of gold subwavelength gratings with different device sizes were fabricated and the optical transmission spectra were measured. As the grating size shrinks, the broadening of the RA-SPP resonances is predicted by the theoretical model. For the first order RA-SPP resonances, the results from this model are in good agreement with the spectra measured from the fabricated plasmonic gratings.
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  • Ren, F., Kim, K. Y., Chong, X., & Wang, A. X. (2015). Effect of finite metallic grating size on Rayleigh anomaly-surface plasmon polariton resonances. Optics Express, 23(22), 28868-28873. doi:10.1364/OE.23.028868
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  • 23
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  • 22
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  • This research is supported by the National Science Foundation Directorate for Engineering under grant No. 1342318 and National Institutes of Health under contract No. 9R42ES024023.
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