SKM 2021 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 4: Poster
DS 4.8: Poster
Dienstag, 28. September 2021, 10:00–13:00, P
Persistent response in ultra-strongly driven mechanical membrane resonators — •Fan Yang1, Felicitas Hellbach1, Felix Rochau1, Wolfgang Belzig1, Eva Weig1,2, Gianluca Rastelli3, and Elke Scheer1 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2Fakultät für Elektrotechnik und Informationstechnik, Technische Universität München, 80333 München, Germany — 3INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy
We study experimentally and theoretically the phenomenon of *persistent response* in ultrastrongly driven membrane resonators. The term persistent response denotes the development of a vibrating state with nearly constant amplitude over an extreme wide frequency range of more than 50% of the eigenfrequency. This phenomenon is unusual and is key to avoid breakdown, since it imposes a self-limitation of the maximum amplitude. We reveal the underlying mechanism by directly imaging the vibrational state using advanced optical interferometry. We argue that this state is related to the nonlinear interaction between higher-order flexural modes and higher-order overtones of the driven mode. Finally, we propose a stability diagram for the different vibrational states that the membrane can adopt.