Emission redistribution from a quantum dot-bowtie nanoantenna

Abstract

We present a combined experimental and simulation study of a single self-assembled InGaAs quantum dot coupled to a nearby ($\sim 25nm$) plasmonic antenna. Micro-photoluminescence spectroscopy shows a $\sim 2.4\times$ increase of intensity, which is attributed to spatial far-field redistribution of the emission from the quantum dot-antenna system. Power-dependent studies show similar saturation powers of $2.5\mu W$ for both coupled and uncoupled quantum dot emission in polarization-resolved measurements. Moreover, time-resolved spectroscopy reveals the absence of Purcell-enhancement of the quantum dot coupled to the antenna as compared to an uncoupled dot, yielding comparable exciton lifetimes of $\tau \sim 0.5ns$. This observation is supported by numerical simulations, suggesting only minor Purcell-effects of $<2\times$ for emitter-antenna separations $>25nm$. The observed increased emission from a coupled quantum dot-plasmonic antenna system is found to be in good qualitative agreement with numerical simulations and will lead to a better understanding of light-matter-coupling in such novel semiconductor-plasmonic hybrid systems

References in corpus (8)

• Photonic quantum technologies
• Manipulation of the Spontaneous Emission Dynamics of Quantum Dots in 2D Photonic Crystals
• Recent advances in exciton based quantum information processing in quantum dot nanostructures
• Surface plasmon resonance spectroscopy of single bowtie nano-antennas using a differential reflectivity method
• Optical properties and interparticle coupling of plasmonic bowtie nanoantennas on a semiconducting substrate
• Unraveling the mesoscopic character of quantum dots in nanophotonics
• Imaging surface plasmon polaritons using proximal self-assembled InGaAs quantum dots
• Towards on-chip generation, routing and detection of non-classical light

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