Searched for: author%3A%22Westra%2C+H.J.R.%22
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Westra, H.J.R. (author)
In this Thesis, nonlinear dynamics and nonlinear interactions are studied from a micromechanical point of view. Single and doubly clamped beams are used as model systems where nonlinearity plays an important role. The nonlinearity also gives rise to rich dynamic behavior with phenomena like bifurcations, stochastic switching and amplitude...
doctoral thesis 2012
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Westra, H.J.R. (author), Karabacak, D.M. (author), Brongersma, S.H. (author), Crego-Calama, M. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)
The interactions between parametrically- and directly-driven vibration modes of a clamped-clamped beam resonator are studied. An integrated piezoelectric transducer is used for direct and parametric excitation. First, the parametric amplification and oscillation of a single mode are analyzed by the power and phase dependence below and above the...
journal article 2011
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Venstra, W.J. (author), Westra, H.J.R. (author), Van der Zant, H.S.J. (author)
We demonstrate the coupling between the fundamental and second flexural modes of a microcantilever. A mechanical analogue of cavity-optomechanics is then employed, where the mechanical cavity is formed by the second vibrational mode of the same cantilever, coupled to the fundamental mode via the geometric nonlinearity. By exciting the cantilever...
journal article 2011
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Venstra, W.J. (author), Westra, H.J.R. (author), Van der Zant, H.S.J. (author)
We investigate the nonlinear dynamics of microcantilevers. We demonstrate mechanical stiffening of the frequency response at large amplitudes, originating from the geometric nonlinearity. At strong driving the cantilever amplitude is bistable. We map the bistable regime as a function of drive frequency and amplitude, and suggest several...
journal article 2010
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Westra, H.J.R. (author), Poot, M. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)
A theoretical and experimental investigation is presented on the intermodal coupling between the flexural vibration modes of a single clamped-clamped beam. Nonlinear coupling allows an arbitrary flexural mode to be used as a self-detector for the amplitude of another mode, presenting a method to measure the energy stored in a specific resonance...
journal article 2010
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Ventra, W.J. (author), Westra, H.J.R. (author), Babaei Gavan, K. (author), Van der Zant, H.S.J. (author)
We demonstrate magnetomotive drive and detection of doubly clamped string resonators in water. A compact 1.9 T permanent magnet is used to detect the fundamental and higher flexural modes of 200??m long resonators. Good agreement is found between the magnetomotive measurements and optical measurements performed on the same resonator. The...
journal article 2009
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Babaei Gavan, K. (author), Westra, H.J.R. (author), Van der Drift, E.W.J.M. (author), Venstra, W.J. (author), Van der Zant, H.S.J. (author)
The effective Young’s modulus of silicon nitride cantilevers is determined for thicknesses in the range of 20–684 nm by measuring resonance frequencies from thermal noise spectra. A significant deviation from the bulk value is observed for cantilevers thinner than 150 nm. To explain the observations we have compared the thickness dependence of...
journal article 2009
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