Nonlinear motion and mechanical mixing in as-grown GaAs nanowires

TL;DR

This paper investigates nonlinear dynamics in GaAs nanowire cantilevers, demonstrating mechanical mixing and signal amplification near resonance, with potential applications in nanoscale sensing and signal processing.

Contribution

It introduces the observation of Duffing-type nonlinearity in GaAs nanowires and utilizes this to achieve mechanical mixing and significant signal amplification.

Findings

Nonlinear behavior described by the Duffing equation.

Mechanical mixing of two excitation frequencies demonstrated.

Signal amplification of up to 26 dB near resonance achieved.

Abstract

We report nonlinear behavior in the motion of driven nanowire cantilevers. The nonlinearity can be described by the Duffing equation and is used to demonstrate mechanical mixing of two distinct excitation frequencies. Furthermore, we demonstrate that the nonlinearity can be used to amplify a signal at a frequency close to the mechanical resonance of the nanowire oscillator. Up to 26 dB of amplitude gain are demonstrated in this way.