Dresden 2020 – wissenschaftliches Programm
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DS 31.9: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P1A
Low-temperature characterization of ultra-strongly driven nanomembrane resonators — •Mengqi Fu, Fan Yang, and Elke Scheer — University of Konstanz, Konstanz, Germany
Ultra-strong nonlinear vibrations of nanoresonators with very high amplitude at room temperature recently have attracted broad interest[1,2]. However, the mechanism behind some of the observations (e.g. squeezing) cannot be derived from the existing theoretical models for strong nonlinearities and including thermal fluctuations.
To reduce the effects of thermal fluctuations of the environment and to elucidate other possible origins of these ultra-strong nonlinear effects, we developed a low-temperature (down to 4K) measurement system to detect flexural vibrations by using on-chip nanoelectrodes and the electromagnetic induction effect in a magnetic field. We characterize this novel detection scheme by studying the flexural vibrations of nanomembrane resonators from the linear to the ultra-strong nonlinear regime at variable temperature. The accuracy of the amplitude detection is 1 nm or better with high stability at all temperatures (4 K to 300 K). In addition, because the deflection signal is converted into high-frequency voltage signals rather than to the commonly used optical interference signal, the inductive scheme presented here is not subject to fundamental limitations imposed by the optical wavelength and is thus well-suited for measurements of the ultra-strong nonlinear regime with high deflection amplitudes.
References  F. Yang et al., Phys. Rev. Lett. 122, 154301 (2019).  J.S. Huber et al., [arXiv:1903.07601v2].