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Subject: search.filters.subject.530Subject: search.filters.subject.620Start date: 2020Author: search.filters.author.Hentschel, MarioInstitute: search.filters.UBSInstitut.Fakultätsübergreifend / Sonstige Einrichtung

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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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    ItemOpen Access
    Terahertz magnetic response of plasmonic metasurface resonators : origin and orientation dependence
    (2024) Tesi, Lorenzo; Hrtoň, Martin; Bloos, Dominik; Hentschel, Mario; Šikola, Tomáš; Slageren, Joris van
    The increasing miniaturization of everyday devices necessitates advancements in surface-sensitive techniques to access phenomena more effectively. Magnetic resonance methods, such as nuclear or electron paramagnetic resonance, play a crucial role due to their unique analytical capabilities. Recently, the development of a novel plasmonic metasurface resonator aimed at boosting the THz electron magnetic response in 2D materials resulted in a significant magnetic field enhancement, confirmed by both numerical simulations and experimental data. Yet, the mechanisms driving this resonance were not explored in detail. In this study, we elucidate these mechanisms using two semi-analytical models: one addressing the resonant behaviour and the other examining the orientation-dependent response, considering the anisotropy of the antennas and experimental framework. Our findings contribute to advancing magnetic spectroscopic techniques, broadening their applicability to 2D systems.