Nano Science and Technology Institute
Nanotech 2012 Vol. 2
Nanotech 2012 Vol. 2
Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational (Volume 2)
Chapter 3: MEMS & NEMS Devices & Applications

Sensitive detection of nonlinear nanomechanical motion using capacitive signal down-mixing for resonant NEMS-based sensors

Authors:N. Kacem, M. Sworowski, S. Hentz, S. Baguet, R. Dufour
Affilation:FEMTO-ST, FR
Pages:223 - 226
Keywords:NEMS, MEMS, nonlinear nanoresonators, capacitive down-mixing
Abstract:Nanoelectromechanical systems (NEMS) are emerging as strong candidates for a host of important applications in semiconductor-based technology and fundamental science. At this level of miniaturization, the electric characterization of capacitive NEMS is a challenge. In fact, the high-frequency signals are normally cut off due to the limited bandwidth of the readout circuitry dominated by stray capacitance between the large amplifier and the high impedance tunneling junction. In order to overcome such limitations, some methods have been suggested: using several amplifier stages, inserting an LC resonator, or the scanning tunneling microscopy down-mixing readout technique. Nevertheless, these methods are efficient only at oscillations below the critical amplitude due to nonlinearities which induce noise mixing. In the present paper, a new characterization technique for resonant NEMS based on capacitive down-mixing has been developed and applied to M&NEMS accelerometers. The considered method is highly sensitive and permits a simple tuning of the signal to nonlinearity ratio.
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