Journal
NANO LETTERS
Volume 15, Issue 2, Pages 1025-1030Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5038819
Keywords
Lithium niobate; nanorings; second harmonic generation; ion beam enhanced etching; plasmonics
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Funding
- German Federal Ministry of Education and Research [PhoNa 03IF2101A, OpMiSen 16SV5577]
- German Research Foundation [PE 1524/5-2]
- Carl Zeiss Stiftung
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Plasmonic nanorings provide the unique advantage of a pronounced plasmonic field enhancement inside their core. If filled with a polarizable medium, it may significantly enhance its optical effects. Here, we demonstrate this proposition by filling gold nanorings with lithium niobate. The generated second harmonic signal is compared to the signal originating from an unpatterned lithium niobate surface. Measurements and simulation confirm an enhancement of about 20. Applications requiring nanoscopic localized light sources like fluorescence spectroscopy or quantum communication will benefit from our findings.
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