Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique
TT 32.36: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Control of vibrational modes and dissipation in nanomechanical resonators — •Stefan Bächle, Clemens Müthing, Elke Scheer, and Artur Erbe — Department of Physics, University of Konstanz
Nanomechanical systems are of interest for a wide range of practical applications (e.g. sensors, actuators) as well as for basic research. The main topic of the latter is to get a better understanding of the processes taking place at the transition of the macro-mechanical and quantum-mechanical regime. Scaling down a resonator to a point when its eigenfrequency exceeds 1 GHz, ℏω can be larger than the thermal energy kBT. To reach this limit resonators with very low dissipation and damping are required. Up to date the correlation between e.g. size and shape of a nanomechanical resonator is still not understood.
We present a magneto-electrical and an optical measurement setup, the sample preparation, as well as Finite Element Simulations on nanomechanical resonators. The eigenfrequencies of these silicon cantilever resonators are between several hundred MHz and up to 5GHz. The measurement setup is based on a HF-signal applied to the resonator, which is placed in a cryostat at 4K. A magnetic field of 1T up to 10T is applied perpendicularly to the samples surface. As a result the resonator is excited and starts to oscillate due to the Lorentz force. The optical measurements are based on a method called ASOPS (Asynchronous Optical Sampling).