Microbubble PhoXonic resonators: Chaos transition and transfer

We report the activation of optomechanical chaotic oscillations in microbubble resonators (MBRs) through a blue-side excitation of its optical resonances. We confirm the sequence of quasi-periodical oscillation, spectral continuum and aperiodic motion; as well as the transition to chaos without external feedback or modulation of the laser source. In particular, quasi periodic transitions and a spectral continuum are reported for MBRs with diameters up to 600 mu m, whereas only an abrupt transition into a spectral con-tinuum is observed for larger microbubbles. (c) 2021 Elsevier Ltd. All rights reserved.