Observation of three-mode parametric instability in a micromechanical resonator

We present systematic experimental observations of three-mode auto-parametric instability in a micromechanicalresonator analogous to previous experimental observations of this effect in optical parametricresonators. The three-mode instability is triggered when a driven mode at frequencyωd couples to two lower frequency modes (frequenciesω1 andω2) such thatωd = ω1 + ω2. Similar to the 2 mode instability, the phenomenon is seen to be threshold dependent and sensitive to driving conditions and system parameters. In support of the experimental observations, a dynamical model has also been specified.

Source: Applied Physics Letters - November 7, 2016 Category: Physics Authors: Adarsh Ganesan, Cuong Do and Ashwin Seshia Source Type: research