Stress-controlled frequency tuning and parametric amplification of the vibrations of coupled nanomembranes

TL;DR

This paper demonstrates noninvasive, stress-controlled tuning of nanomembrane vibrations and shows enhanced parametric amplification of thermal fluctuations using piezoelectric actuation, achieving significant amplification factors.

Contribution

It introduces a method for tuning nanomembrane resonance frequencies via piezoelectric stress control and demonstrates enhanced parametric amplification of thermal vibrations.

Findings

Achieved up to 20 dB amplification of thermal fluctuations

Demonstrated noninvasive frequency tuning of nanomembranes

Enhanced parametric amplification using piezoelectric actuation

Abstract

Noninvasive tuning of the mechanical resonance frequencies of suspended parallel nanomembranes in various monolithic arrays is achieved by piezoelectric control of their tensile stress. Parametric amplification of their thermal fluctuations is shown to be enhanced by the piezoelectric actuation and amplification factors of up to 20 dB in the sub-parametric oscillation threshold regime are observed.