期刊
OPTICS EXPRESS
卷 18, 期 13, 页码 14079-14086出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.014079
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Theoretical demonstration of efficient coupling and power concentration of radially-polarized light on a conical tip of plasmonic needle is presented. The metallic needle is grown at the center of radial plasmonic grating, engraved in a metal surface. The electromagnetic field distribution was evaluated by Finite Elements and Finite-Difference-Time-Domain methods. The results show that the field on the tip of the needle is significantly enhanced compared to the field impinging on the grating. The power enhancement exhibited a resonant behavior as a function of needle length and reached values of similar to 10(4). Test samples for few types of characterization schemes were fabricated. (C) 2010 Optical Society of America
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