Seminar: Frederik Schröder

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

Frederik Schröder, AG Quantum Communication Systems, Institute for Solid State Physics, Technische Universität Berlin, Berlin, Germany
AbstractSemiconductor quantum dots embedded in engineered microcavities are considered key building blocks for photonic quantum technologies [1]. The direct fiber-coupling of respective devices would thereby offer many advantages for practical applications [2]. Here, I present a method for the direct and permanent coupling of electrically operated quantum-dot micropillar-cavities to single-mode fibers [3]. The fiber-coupling technique is based on a robust four-step process fully carried out at room temperature, which allows for the deterministic coupling of a selected target device. Using the cavity mode electroluminescence as feedback parameter, precise fiberto- pillar alignment is maintained during the whole process. Permanent coupling is achieved in the last process step using UV curing of optical adhesive. The results are an important step towards the realization of plug-and-play electrically-driven single-photon sources.
[1] T. Heindel et al., Appl. Phys. Lett. 96, 011107 (2010)
[2] T. Kupko et al., arXiv.2105.03473 (2021)
[3] L. Rickert et al., arXiv.2102.12836 (2021)