Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Poster Session - Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 83.7: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/EG

Spatially-resolved hyper spectral single quantum dot strong coupling — •Benedikt Schurr, Daniel Friedrich, Heiko Gross, and Bert Hecht — NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Germany

Strong coupling single emitters and plasmonic nano resonators at ambient conditions opens new prospects for applications of quantum technologies. In the past decade multiple types of photonic cavities and emitters were investigated. [1] However only recently it became possible to directly tune the coupling strength by means of scanning probe technology. [2]

Here, we report a qualitative hyperspectral analysis of strong coupling between single colloidal CdSe quantum dots and plasmonic nanoresonators fabricated at a scanning probe tip. When using precise helium ion beam milling to achieve sub 10 nm light localization, we observe an increased Rabi splitting of up to 160 meV. The larger splitting in combination with high-resolution scanning allows us to record spatially resolved maps of the coupling strength between the emitter and the plasmonic resonator mode.

[1] O. Bitton et al., Nanophotonics 8 (4), 559-575 (2019)

[2] H. Gross et al., Sci. Adv. 4, eaar4906 (2018)