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arXiv · 2102.12836

Fiber-pigtailing quantum-dot cavity-enhanced light emitting diodes

Lucas Rickert·Frederik Schröder·Timm Gao·Christian Schneider·S. Höfling·T. Heindel
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Abstract

We report on a process for the fiber-coupling of electrically driven cavity-enhanced quantum dot light emitting devices. The developed technique allows for the direct and permanent coupling of p-i-n-doped quantum dot micropillar cavities to single-mode optical fibers. The coupling process, fully carried out at room temperature, involves a spatial scanning technique, where the fiber facet is positioned relative to a device with a diameter of 2 $μ$m using the fiber-coupled electroluminescence of the cavity emission as a feedback parameter. Subsequent gluing and UV curing enables a rigid and permanent coupling between micropillar and fiber core. Comparing our experimental results with finite element method simulations indicates a cavity-to-fiber mode-coupling efficiency of ~46%. Furthermore, we demonstrate pulsed current injection at a repetition rate exceeding 200 MHz as well as low-temperature operation down to 77 K of the fiber-coupled micropillar device. The technique presented in this work is an important step in the quest for efficient and practical quantum light sources for applications in quantum information.

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Lucas Rickert, Frederik Schröder, Timm Gao, Christian Schneider, S. Höfling, T. Heindel. 2021-09-22. Fiber-pigtailing quantum-dot cavity-enhanced light emitting diodes. https://doi.org/10.1063/5.0063697

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