Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
Volume 27, Issue 7, Pages 1555-1560Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAA.27.001555
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Funding
- Natural Science Foundation of China (NSFC) [10804057]
- Ministry of Education of China [708021]
- Program for New Century Excellent Talents in University [NCET-08-0289]
- 973 Project [2007CB307001]
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We propose systematic investigations of the electromagnetic enhancement by a single nano-groove in gold substrate. The impacts of the groove parameters and of the illumination conditions on the enhanced intensity are explored using a fully vectorial numerical method. The obtained data can be well predicted and explained by a simple Fabry-Perot model. By virtue of the semi-analytical model, we identify two main factors that enable giant electric-field enhancement in very narrow grooves: the Fabry-Perot resonance and the large wave impedance of the fundamental mode in the groove. (C) 2010 Optical Society of America
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