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Subject: search.filters.subject.530Subject: search.filters.subject.620Start date: 2020Author: search.filters.author.Giessen, HaraldInstitute: search.filters.UBSInstitut.Institut für Technische Optik

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    Positional accuracy of 3D printed quantum emitter fiber couplers
    (2024) Weber, Ksenia; Thiele, Simon; Hentschel, Mario; Herkommer, Alois; Giessen, Harald
    Precise positioning of optical elements plays a key role in the performance of optical systems. While additive manufacturing techniques such as 3D printing enable the creation of entire complex micro‐objectives in one step, thus rendering lens alignment unnecessary, certain applications require precise positional alignment of the printing process with respect to the substrate. For example, in order to efficiently couple quantum emitters to single‐mode fibers, which is a crucial step in the development of real world quantum networks, precise alignment between the emitter, the coupling optics, and the single‐mode fiber is of utmost importance. In this work, the positioning accuracy of a Photonics Professional GT (Nanoscribe GmbH) 3D printing machine is evaluated by using the integrated piezo stage to align to gold markers that is manufactured via e‐beam lithography. By running a statistical analysis of 38 printing cycles, a mean positional error of only 80 nm is determined. Additionally, an entire system is 3D printed that can couple quantum emitters to optical single‐mode fibers. Examining the focal spot of the 3D printed micro‐optics, a positional accuracy of ≈ 1 µm in all three dimensions is found, as well as excellent quality of the focal spot.
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    Collecting telecom photons from circular Bragg gratings using optical fibers and 3D printed micro‐lenses
    (2025) Tran, Nam; Ruchka, Pavel; Jakovljevic, Sara; Breiholz, Benjamin; Gierß, Peter; Vijayan, Ponraj; Jimenez, Carlos Eduardo; Herkommer, Alois; Jetter, Michael; Portalupi, Simone Luca; Giessen, Harald; Michler, Peter
    Deterministic sources of quantum light are becoming increasingly relevant in the development of quantum communication, particularly in deployed fiber networks. Therefore, efficient fiber‐coupled sources at telecom wavelength are highly sought after. With this goal in mind, the fiber coupling performance of quantum dots is systematically investigated in optical resonators under three experimental configurations. For the first time coupling efficiency and sensitivity are quantified to spatial displacement for single‐mode fibers with 3D printed optics on their tip, and benchmark their behavior over a commercial cleaved‐cut fiber and a standard optical setup. The reduction of the required optical elements when operating with a lensed or a bare fiber allows for an increased end‐to‐end efficiency over a standard setup. For the perspective of realizing a mechanically stable fiber‐coupled source, the spatial tolerance is precisely quantified to fiber‐cavity misalignment, observing less than 50%$50 \,\%$count rate drop for several micrometers displacement. In the spirit of precise quantification and reproducibility, the experiments are performed on multiple photonic resonators. These results will play a key role in the future development of fiber‐coupled sources of quantum light.