Searched for: faculty:"Applied%5C%2BSciences"
(1 - 6 of 6)
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Poot, M. (author), Etaki, S. (author), Yamaguchi, H. (author), Van der Zant, H.S.J. (author)
We have employed a feedback cooling scheme, which combines high-frequency mixing with digital signal processing. The frequency and damping rate of a 2 MHz micromechanical resonator embedded in a dc SQUID are adjusted with the feedback, and active cooling to a temperature of 14.3 mK is demonstrated. This technique can be applied to GHz resonators...
journal article 2011
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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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Witkamp, B. (author), Poot, M. (author), Pathangi, H. (author), Hüttel, A.K. (author), Van der Zant, H.S.J. (author)
We have fabricated suspended metal paddle resonators with carbon nanotubes functioning as self-detecting torsional springs. We observe gate-tunable resonances that either tune to higher or to lower frequencies when increasing the dc voltage on the back gate. We attribute the former modes to flexural vibrations of the paddle resonator, while the...
journal article 2008
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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), 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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Meerwaldt, H.B. (author), Johnston, S.R. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)
We report fast readout of the motion of a carbon nanotube mechanical resonator. A close-proximity high electron mobility transistor amplifier is used to increase the bandwidth of the measurement of nanotube displacements from the kHz to the MHz regime. Using an electrical detection scheme with the nanotube acting as a mixer, we detect the...
journal article 2013
Searched for: faculty:"Applied%5C%2BSciences"
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