Multimode internal resonances in a MEMS self-sustained oscillator

Self-sustained micromechanical oscillator with linear feedback

Autonomous oscillators, such as clocks and lasers, produce periodic signals \emph{without} any external frequency reference. In order to sustain stable periodic motions, there needs to be external energy supply as well as nonlinearity built into the oscillator to regulate the amplitude. Usually, nonlinearity is provided by the sustaining feedback mechanism, which also supplies energy, whereas the constituent resonator that determines the output frequency stays linear. Here we propose a new self-sustaining scheme that relies on the nonlinearity originating from the resonator itself to limit the…

横模耦合光机谐振器中的多模振荡及其通往混沌的路径

Multimode oscillation and its route to chaos in transverse-mode-coupled optomechanical resonators

本文展示横模耦合光机平台，通过工程化机械模式抑制低阶内共振，实现稳定多模振荡，并观察拍频分数化及混沌，为高维非线性动力学提供可扩展平台。

Intermodulation of optical frequency combs in a multimode optomechanical system

Phonons offer the possibility to connect the microwave and optical domains while being efficiently transduced with electronic and optical signals. Here, we present a multimodal optomechanical platform, consisting of a mechanical-optical-mechanical resonator configuration. The mechanical modes, with frequencies at 265 MHz and 6.8 GHz, can be simultaneously excited into a phonon lasing regime as supported by a stability analysis of the system. Both the MHz and the GHz modes enter a self-sustained oscillation regime, leading to the intermodulation of two frequency combs in the optical field. We c…