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Analyzing bowtie structures with sharp tips by a vertical mode expansion method
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DOI：10.1364/OE.26.032346.png)
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Bowtie structures of metallic nanoparticles are very effective in producing strong local fields needed in many applications. Existing numerical studies on bowtie structures are limited to those with rounded tips. Due to the field singularities at sharp edges and corners, accurate numerical solutions for bowtie structures with mathematically sharp tips are difficult to obtain. Based on an improved vertical mode expansion method (VMEM) that incorporates boundary integral equation techniques for domains with corners, we analyze bowtie structures with truly sharp tips. Numerical results are presented to reveal the effects of a few key factors including the distance between the tips, the apex angle and the substrate. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keyword:
SCATTERING
HOLE
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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