Nonlinear dynamics control of GaAs nanomechanical resonator using laser.

To control, manipulate and read-out nanomechanical resonators is of great significance for many applications. In this work, we start by constructing a nonlinear dynamical model that is deduced from the fundamental beam, photon-electron interaction and energy band theories, with the aim to describe a complicated cavity-less optomechanical coupling process. Based on the established model, the manipulation on resonator's response including soften and hardening effect due to laser injection is firstly revealed. Taking the form of the laser parametric driving, the controlling on resonator's dynamics, in particular the nonlinear regime, is comprehensively investigated. It is found that both the laser power and frequency can be used for direct manipulating the NEMS resonator's dynamics, such as amplitude amplification, periodicity changing and periodic-chaotic state conversion. Bifurcation diagrams are given subsequently manifesting a deterministic dynamics evolving route. Finally, the controlling on chaotic states of the nanomechanical resonator using laser parametric driving is specially studied. The Max lyapunov Exponents together with time series calculation shows that at a few frequency points of the injecting laser the chaotic states can be controlled. The work not only provides the guidance for using laser to control nanoscale resonators, but also sheds light in exploring novel applications based on nonlinear NEMS resonators.