Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: Nanomechanical systems (joint session HL/TT)
TT 32.1: Talk
Tuesday, March 10, 2026, 10:00–10:15, POT/0051
Mechanical characterization of freely-suspended crystalline YIG nanodevices — •Jonny Qiu1,2, Matthias Grammer4,5, Sebastian Sailler6, Sebastian T. B. Goennenwein6, Michaela Lammel6, Hans Huebl3,4,5, and Eva Weig1,2,3 — 1TUM School of Computation, Information and Technology, Garching, Germany — 2Zentrum für Quantum Engineering, Garching, Germany — 3Munich Center for Quantum Science and Technology, Munich, Germany — 4TUM School of Natural Sciences, Garching, Germany — 5Walther-Meißner-Institut, BAdW, Garching, Germany — 6University of Konstanz, Department of Physics, Konstanz, Germany
Efficient quantum transduction, the reciprocal conversion of quantum signals from one energy level to another, is an ongoing challenge in quantum network applications. Engelhardt et al. [1] proposed a microwave to optical converter (MWOC) that co-localizes microwave, magnetic and elastic excitations within a suspended optomechanical crystal (OMC) made of crystalline yttrium iron garnet (YIG).
In this talk, we report our progress towards realizing the MWOC and present freely-suspended YIG nanodevices. We fabricated YIG cantilevers and beams using an electron beam lithography process and a subsequent crystallization by annealing approach. Piezo-driven interferometric spectroscopy reveals the mechanical response modes of these devices, from which we extract Young's modulus and internal stress to design the OMC as a MWOC. We visualize and thus confirm the corresponding mode shapes via laser doppler vibrometry.
[1] F. Engelhardt, et al., Phys. Rev. Appl. 18, 044059 (2022).
Keywords: Nanomechanics; YIG; Optomechanical Crystals