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Q: Fachverband Quantenoptik und Photonik

Q 38: Nano-Optics (Single Quantum Emitters) II

Q 38.4: Vortrag

Mittwoch, 13. März 2019, 14:45–15:00, S SR 112 Maschb.

Towards ultrafast photodynamic in quantum emitters — •Assegid M. Flatae, Haritha Kambalathmana, Stefano Lagomarsino, Florian Sledz, Lukas Hunold, and Mario Agio — Laboratory of Nano-Optics and Cμ, University of Siegen, 57072 Siegen, Germany

Controlling photophysical processes of single emitters, for example, by strong modification of the radiative decay rate, may lead to unexplored capabilities in the generation of quantum states of light.

We develop techniques for the fabrication and optical characterization of photostable quantum emitters based on the silicon-vacancy (SiV) color center in diamond [1] and semiconductor quantum dots (QDs). The SiV color center is a promising single-photon source as most of the fluorescence signal is concentrated in a narrow zero-phonon line, whereas colloidal QDs provide a rich playground to explore the photophysics.

We use plasmonic nanocones [2] as optical antennas to enhance the radiative decay rate by orders of magnitudes. We explore the controlled coupling between a single quantum emitter with a single nanocone and achieved a reproducible enhancement of the radiative decay rate by two orders of magnitude. Our goal is to reach enhancements of more than three orders of magnitude, which would lead to ultrafast photodynamic and emission of nearly lifetime limited single photons at room temperature.

References: [1] S. Lagomarsino, et al. Diam. Relat. Mater. 84, 196 (2018). [2] A. M. Flatae, et al. Adv. Optical Mater. 5, 1700586 (2017).