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Near-field Moiré effect mediated by surface plasmon polariton excitation

By Zhaowei Liu, Stéphane Durant, Hyesog Lee, Yi Xiong, Yuri Pikus, Cheng Sun and Xiang Zhang


We have demonstrated a surface plasmon polariton mediated optical Moiré effect by inserting a silver slab between two subwavelength gratings. Enhancement of the evanescent fields by the surface plasmon excitations on the silver slab leads to a remarkable contrast improvement in the Moiré fringes from two subwavelength gratings. Numerical calculations, which agree very well with the experimental observation of evanescent-wave Moiré fringes, elucidate the crucial role of the surface plasmon polaritons. The near-field Moiré effect has potential applications to extend the existing Moiré techniques to subwavelength characterizatio

Year: 2006
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