Resonant plasmon nanofocusing by closed tapered gaps.
basic_science · Level V
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- Record sourced from PubMed, PMID 20028028.
- Also identified by DOI 10.1021/nl903563e.
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Abstract
We study radiation nanofocusing by closed tapered gaps, i.e. metal V-grooves, under normal illumination, and discover that the local field inside a groove can be resonantly enhanced due to interference of counter-propagating gap plasmons. Considering V-grooves milled in gold, we analyze this phenomenon theoretically, deriving an analytic expression for the resonance condition and predicting more than 550-fold intensity enhancements at resonance, and observe it experimentally with two-photon photoluminescence microscopy, demonstrating more than 100-fold intensity enhancements.
Medical subject headings
- Biosensing Techniques
- Nanotechnology