Berlin 2012 – wissenschaftliches Programm

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SYNM: Symposium Frontiers of Nanomechanics

SYNM 1: Frontiers of Nanomechanics

SYNM 1.3: Hauptvortrag

Mittwoch, 28. März 2012, 16:00–16:30, H 0105

Integrated transduction and coherent control of high Q nanomechanical systems using dielectric gradient forces — •Eva M. Weig — LMU München

Nanomechanical resonators, freely suspended bridges with nanoscale cross-sections, are receiving an increasing amount of attention both in fundamental experiments and sensing applications. In particular, pre-stressed silicon nitride is explored as a high Q material for nanomechanical systems (NEMS): As a consequence of the intrinsic tensile stress of the nitride film, room temperature quality factors of several 100,000 are observed in the 10 MHz eigenfrequency range. To take advantage of the large quality factor, non-dissipative transduction and manipulation schemes have to be developed which do not introduce extra damping.

We employ optically or electrically induced gradient forces to implement dielectric transduction as an efficient way to actuate and probe high Q nanomechanical resonators and to control the resonator eigenfrequency. The displacement sensitivity can be enhanced considerably by taking advantage of near-field coupling to a cavity, which, at the same time allows to benefit from back-action induced dynamics, enabling to cool the Brownian motion or to initiate cavity-pumped self-oscillation. A realization based on a room temperature microwave cavity offers a plug and play solution for all-integrated transduction, and can be employed to probe the dynamics of two strongly coupled resonator modes.