Enhanced Photon Extraction from a Nanowire Quantum Dot Using a Bottom-Up Photonic Shell

Abstract

Semiconductor nanowires offer the possibility to grow high-quality quantum-dot heterostructures, and, in particular, CdSe quantum dots inserted in ZnSe nanowires have demonstrated the ability to emit single photons up to room temperature. In this paper, we demonstrate a bottom-up approach to fabricate a photonic fiberlike structure around such nanowire quantum dots by depositing an oxide shell using atomic-layer deposition. Simulations suggest that the intensity collected in our NA = 0.6 microscope objective can be increased by a factor 7 with respect to the bare nanowire case. Combining microphotoluminescence, decay time measurements, and numerical simulations, we obtain a fourfold increase in the collected photoluminescence from the quantum dot. We show that this improvement is due to an increase of the quantum-dot emission rate and a redirection of the emitted light. Our ex situ fabrication technique allows a precise and reproducible fabrication on a large scale. Its improved extraction efficiency is compared to state-of-the-art top-down devices.

References in corpus (11)

• Triggered single photons from a quantum dot
• Entangled Photon Pairs from Semiconductor Quantum Dots
• Review: Semiconductor Quantum Light Sources
• Bright single-photon sources in bottom-up tailored nanowires
• Experimental realization of highly-efficient broadband coupling of single quantum dots to a photonic crystal waveguide
• The photonic trumpet: An efficient, broadband interface between a solid-state quantum emitter and a Gaussian beam
• Polarization properties of excitonic qu-bits in single self-assembled quantum dots
• Dark exciton optical spectroscopy of a semiconducting quantum dot embedded in a nanowire
• Strain in crystalline core-shell nanowires
• Open geometry Fourier modal method: Modeling nanophotonic structures in infinite domains
• Light-hole Exciton in Nanowire Quantum Dot

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• Brightness and purity of a room-temperature single-photon source in the blue-green range