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Dugay, J. (author), Giménez-Marqués, Mónica (author), Venstra, W.J. (author), Torres-Cavanillas, Ramón (author), Sheombarsing, U.N. (author), Manca, N. (author), Coronado, Eugenio (author), van der Zant, H.S.J. (author)In the past years, the use of highly sensitive silicon microelectromechanical cantilevers has been proposed as a tool to characterize the spin-crossover phenomenon by employing fast optical readout of the motion. In this work, Fe <sup>II</sup> -based spin-crossover nanoparticles of the well-known [Fe(Htrz) <sub>2</sub> (trz)](BF <sub>4</sub>...journal article 2019
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Manca, N. (author), Mattoni, G. (author), Pelassa, Marco (author), Venstra, W.J. (author), van der Zant, H.S.J. (author), Caviglia, A. (author)Strain engineering is one of the most effective approaches to manipulate the physical state of materials, control their electronic properties, and enable crucial functionalities. Because of their rich phase diagrams arising from competing ground states, quantum materials are an ideal playground for on-demand material control and can be used...journal article 2019
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- Houri, S. (author), Cartamil Bueno, S.J. (author), Poot, M. (author), Steeneken, P.G. (author), van der Zant, H.S.J. (author), Venstra, W.J. (author) journal article 2017
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Davidovikj, D. (author), Slim, J.J. (author), Cartamil Bueno, S.J. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author), Venstra, W.J. (author)Membranes of suspended two-dimensional materials show a large variability in mechanical properties, in part due to static and dynamic wrinkles. As a consequence, experiments typically show a multitude of nanomechanical resonance peaks, which make an unambiguous identification of the vibrational modes difficult. Here, we probe the motion of...journal article 2016
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Kramer, E. (author), Van Dorp, J. (author), Van Leeuwen, R. (author), Venstra, W.J. (author)We investigate the effect of mechanical strain on the dynamics of thin MoS2 nanodrum resonators. Using a piezoelectric crystal, compressive and tensile biaxial strain is induced in initially flat and buckled devices. In the flat device, we observe a remarkable strain-dependence of the resonance line width, while the change in the resonance...journal article 2015
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Houri, S. (author), Geuze, M.J. (author), Venstra, W.J. (author)We demonstrate thermo-mechanical relaxation oscillations in a strongly driven quartz crystal. Dynamic bifurcation leads to two stable oscillation states with a distinct electrical impedance. Slow Joule-heating, which shifts the susceptibility of the crystal, provides a feedback that leads to thermally induced oscillations in which the amplitude...journal article 2015
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Cartamil Bueno, S.J. (author), Steeneken, P.G. (author), Tichelaar, F.D. (author), Navarro Moratalla, E. (author), Venstra, W.J. (author), Leeuwen, R. (author), Coronado, E. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author), Castellanos-Gomez, A. (author)Controlling the strain in two-dimensional (2D) materials is an interesting avenue to tailor the mechanical properties of nanoelectromechanical systems. Here, we demonstrate a technique to fabricate ultrathin tantalum oxide nanomechanical resonators with large stress by the laser oxidation of nano-drumhead resonators composed of tantalum...journal article 2015
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Van Leeuwen, R. (author), Karabacak, D.M. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)We study the dynamics of a nonlinear electromechanical oscillator with delayed feedback. Compared to their linear counterparts, we find that the dynamics is dramatically different. The well-known Barkhausen stability criterion ceases to exist, and two modes of operation emerge: one characterized by hysteresis in combination with a bistable...journal article 2013
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Venstra, W.J. (author), Van Leeuwen, R. (author), Van der Zant, H.S.J. (author)We demonstrate a strong coupling between the flexural vibration modes of a clamped-clamped micromechanical resonator vibrating at low amplitudes. This coupling enables the direct measurement of the frequency response via amplitude- and phase modulation schemes using the fundamental mode as a mechanical detector. In the linear regime, a frequency...journal article 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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Venstra, W.J. (author), Spronck, J.W. (author), Sarro, P.M. (author), Van Eijk, J. (author)Photolithography on high topography substrates, such as the sidewalls or the bottom of cavities and trenches created by bulk micromachining, enables the design of complex three-dimensional structures. When a contact lithography system is used to pattern such substrates, local gaps exist between the mask and the substrate. In this paper we...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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Roodenburg, D. (author), Spronck, J.W. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)We have used double clamped beams to implement a mechanical memory. Compressive stress is generated by resistive heating of the beams and beyond the buckling limit the bistable regime is accessed. Bits are written by applying lateral electrostatic forces. The state of the beam is read out by measuring the capacitance between beam and electrodes....journal article 2009
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Babaei Gavan, K. (author), Van der Drift, E.W.J.M. (author), Venstra, W.J. (author), Zuiddam, M.R. (author), Van der Zant, H.S.J. (author)We present a systematic investigation of the dynamic properties of silicon nitride cantilevers in air. The thermal noise spectra of cantilevers have been measured using a home-made optical deflection setup. Torsional and flexural resonances up to the seventh mode are observed. The dependence of resonance frequencies on the dimensions and mode...journal article 2009
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Venstra, W.J. (author), Van der Zant, H.S.J. (author)We present a method for efficient spectral readout of mechanical resonator arrays in dissipative environments. Magnetomotive drive and detection are used to drive double clamped resonators in the nonlinear regime. Resonators with almost identical resonance frequencies can be tracked individually by sweeping the drive power. Measurements are...journal article 2008
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Venstra, W.J. (author)The invention relates to a method for the fabrication of a membrane oriented in a (111) plane of a (100) silicon wafer. To this end the method comprises the following steps: applying a mask to both sides of the wafer, wherein portions of the sides are covered by the mask; and the at least partial removal by etching away silicon material from the...patent 2004