Journal
NANO LETTERS
Volume 17, Issue 2, Pages 1219-1225Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b05026
Keywords
Gallium phosphide; dielectric nanoantennas; second harmonic generation; fluorescence enhancement; Purcell effect
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Funding
- EPSRC Reactive Plasmonics Programme [EP/M013812/1]
- ONR Global
- Leverhulme Trust
- Royal Society [UF150542]
- Lee-Lucas Chair in Physics
- Marie Sklodowska-Curie actions Early Stage Researcher programme
- Marie Sklodowska-Curie actions Rsearcher Fellow programme
- Engineering and Physical Sciences Research Council [EP/M013812/1] Funding Source: researchfish
- EPSRC [EP/M013812/1] Funding Source: UKRI
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We present all-dielectric gallium phosphide (GaP) nanoantennas as an efficient nanophotonic platform for surface-enhanced second harmonic generation (SHG) and fluorescence (SEF), showing negligible losses in the visible range. Employing single GaP nanodisks, we observe an increase of more than 3 orders of magnitude in the SHG conversion signal in comparison with the bulk. This constitutes an SHG efficiency as large as 0.0002%, which is to the best of our knowledge the highest yet achieved value for a single nano object in the optical region. Furthermore, we show that GaP dimers with 35 nm gap can enhance up to 3600 times the fluorescence emission of dyes located in the gap of the nanoantenna. This is accomplished by a fluorescence lifetime reduction of at least 22 times, accompanied by a high-intensity field confinement in the gap region. These results open new avenues for low-loss nanophotonics in the optical regime.
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