2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Anomalous Thermomechanical Softening-Hardening Transitions in Micro-oscillators

T. Sahai, R. Bhiladvala, A. Zehnder
Cornell University, US

nonlinear dynamics, resonance, softening, hardening, optical detection

This work documents and explains a counter-intuitive nonlinear phenomenon, where the laser-detected resonant motion of forced, micromechanical oscillators can be tuned from softening to hardening by increasing the laser power incident on a prestressed silicon nitride oscillator. This tuning is explained by a thermo-mechanical model in which linear and nonlinear stiffness contributions have opposing responses to temperature change.

Nanotech 2008 Conference Program Abstract