Regensburg 2022 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Focus Session: Nonlinear Dynamics of Nanomechanic Oscillators

DY 12.5: Vortrag

Montag, 5. September 2022, 17:00–17:15, H20

Sideband and noise squeezing effects in nonlinear mechanical membrane resonators — •Mengqi Fu¹, Fan Yang¹, Yuxuan Jiang², and Elke Scheer¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — ²Anhui University, Hefei, China

The nonlinearity of a mechanical system has been shown to squeeze the noise by redistributing it in two conjugates of the observables under certain conditions and therefore provides a way to break the sensing limit of mechanical systems. In this work, we develop a novel method to characterize the noise squeezing of a nonlinear mechanical system by the frequency response of the low-frequency modulation based on a suspended silicon nitride (Si-N) membrane (∼ 500 nm thickness) structure [1]. We first demonstrate an antiresonance effect between the “quasi modes” of the nonlinear mechanical system in the sideband spectra through low-frequency two-tone probing measurements. Then a direct connection between the antiresonance frequency and the noise squeezing factor of the system can be established to characterize the noise squeezing factor in a simple and robust method.

[1] F. Yang et at., Phys. Rev. Lett., 127, 184301 (2021).