Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Nano-Optics (Single Quantum Emitters and Plasmonics)

Q 54.5: Talk

Thursday, March 8, 2018, 11:30–11:45, K 0.023

Plasmonic enhancement at a liquid-solid interface — •Yazgan Tuna and Vahid Sandoghdar — Max-Planck-Institute for the Science of Light

Trapping and manipulation of small objects have been of great interest for a range of applications. Here we report on electrostatic trapping of charged nanoparticles between the aperture of a nanopipette and a glass substrate without the need for external potentials [1]. We employ our technique to the manipulation of a plasmonic nanoantenna in an aqueous solution in order to scan a trapped gold nanosphere in the near field of a single colloidal quantum dot embedded under the substrate surface. We demonstrate about 8-fold fluorescence enhancement over a lateral full width at half-maximum of about 45 nm [2]. We analyze our results with the outcome of numerical electromagnetic simulations under consideration of the electrostatic free energy in the trap. Our approach could find applications in a number of experiments, where plasmonic effects are employed at liquid-solid interfaces.

[1] Kim, J. T. et al. Nat. Commun. 5, 3380 (2014). [2] Y. Tuna et al. ACS Nano. 11, 7674 (2017).