2026-04-13T02:35:57Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/4358262024-10-31T03:06:16Zcom_2072_98col_2072_378192

00925njm 22002777a 4500 dc Navarro Urrios, Daniel author Capuj, Nestor Eduardo author Colombano Sosa, Martin author García Fernández, Pedro David author Sledzinska, Marianna author Alzina, Francesc author Griol, Amadeu author Martínez, Alejandro author Sotomayor Torres, Clivia M. author 2017 Altres ajuts: Beatriu de Pinos postdoctoral fellowship (BP-DGR 2015) Optical nonlinearities, such as thermo-optic mechanisms and free-carrier dispersion, are often considered unwelcome effects in silicon-based resonators and, more specifically, optomechanical cavities, since they affect, for instance, the relative detuning between an optical resonance and the excitation laser. Here, we exploit these nonlinearities and their intercoupling with the mechanical degrees of freedom of a silicon optomechanical nanobeam to unveil a rich set of fundamentally different complex dynamics. By smoothly changing the parameters of the excitation laser we demonstrate accurate control to activate two- A nd four-dimensional limit cycles, a period-doubling route and a six-dimensional chaos. In addition, by scanning the laser parameters in opposite senses we demonstrate bistability and hysteresis between two- A nd four-dimensional limit cycles, between different coherent mechanical states and between four-dimensional limit cycles and chaos. Our findings open new routes towards exploiting silicon-based optomechanical photonic crystals as a versatile building block to be used in neurocomputational networks and for chaos-based applications. Nonlinear phenomena Optomechanics Photonic crystals Nonlinear dynamics and chaos in an optomechanical beam