Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 24: Nanomechanics
TT 24.1: Talk
Wednesday, March 28, 2012, 09:30–09:45, H 3005
Dynamics of strongly coupled nanomechanical resonators — •Benjamin A. Gmeiner, Onur Basarir, Jörg P. Kotthaus, and Eva M. Weig — Fakultät für Physik and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU), Geschwister-Scholl-Platz 1, D-80539 München, Germany
In this work we study the modal interactions between two strongly coupled nanoelectromechanical (NEMS) resonators.
To this end, we have fabricated a system of two doubly-clamped silicon nitride (SiN) string resonators coupled via a shared mechanical support using a series of standard clean room techniques. Each string resonator is equipped with a set of integrated electrodes allowing for an independent frequency tuning and mechanical excitation using dielectric gradient forces [1]. A shot noise-limited Fabry-Perot interferometer operating at 1550 nm has been used for the detection of the nanomechanical motion.
We have characterized a set of devices with fundamental resonance frequencies around 8 MHz and quality factors of Q>2·104 at room temperature in high vacuum. By tuning the resonance frequencies and driving each resonator across its resonance we have observed avoided mechanical mode crossings in the high frequency spectrum, characteristic for a strongly coupled system.
These experiments are the important steps in understanding strongly coupled mechanical systems and might be utilized for enhanced sensor configurations based on collective and
non-linear phenomena.
Q. P. Unterreithmeier, E. M. Weig, and J. P. Kotthaus, Nature (London) 458, 1001 (2009)