Abstract
We investigate the fluorescence properties of colloidal quantum dots coupled to gold nanowire antennas. By varying the wire length, the plasmon modes of the nanoantennas are successively tuned through the emission band of the quantum dots. We observe a pronounced fluorescence enhancement both for short and long nanoantennas. These findings can be attributed to the coupling of the quantum dots to the bright dipole plasmon mode and the dark quadrupol plasmon mode, respectively. This interpretation is supported by numerical calculations of the far-field scattering spectra and the radiation rates.
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Acknowledgements
S.L. acknowledges financial support through DFG TRR 185 and by the German Federal Ministry of Education and Research through the funding program Photonics Research Germany (Project 13N14150). K.B. acknowledges financial support by the German Federal Ministry of Education and Research through the funding program Photonics Research Germany (Project 13N14149).
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Peter, M., Werra, J.F.M., Friesen, C. et al. Fluorescence enhancement by a dark plasmon mode. Appl. Phys. B 124, 83 (2018). https://doi.org/10.1007/s00340-018-6953-6
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DOI: https://doi.org/10.1007/s00340-018-6953-6