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HL: Halbleiterphysik
HL 4: Bauelemente
HL 4.2: Talk
Monday, March 26, 2001, 10:45–11:00, S17
Parametric frequency tuning of phase-locked nano-electromechanical resonators — •Robert Blick1, Artur Erbe1, Gilberto Corso2, and Klaus Richter2 — 1Center for NanoScience, University of Munich — 2Max-Planck-Institut für Physik komplexer Systeme
Recently parametric amplification was demonstrated in micromechanical resonators at several kHz, but not in the radio frequency (RF) range. The obvious approach to achieve RF operation is to scale down the already known sensors and actuators from micro-electromechanical systems (MEMS) to the nanometer scale. This increases the possible mechanical frequencies by orders of magnitude, allowing one to reach resonance frequencies in the GHz range. The major disadvantage of nano-electromechanical systems (NEMS) up to now, however, is the relatively low gain and small bandwidth, which limits the detection sensitivity of the nanomechanical resonator. We present a straight forward scheme with which this bandwidth limitation can easily be overcome by means of parametric frequency tuning of a mechanical resonator. We employ string resonators, since the mechanical mode spectrum is much more simple than for torsional resonators and the achievable eigenfrequencies by now indeed approach the GHz-regime.