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28 Apr 2003

Volume 82, Issue 17, pp. 2749-2924

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Appl. Phys. Lett. 82, 2957 (2003); http://dx.doi.org/10.1063/1.1571977 (3 pages)

Tadashi Kawazoe, Kiyoshi Kobayashi, Suguru Sangu, and Motoichi Ohtsu
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Decrease of the resonance bandwidth of micromechanical oscillators by phase control of the driving force

Javier Tamayo and Laura M. Lechuga

Appl. Phys. Lett. 82, 2919 (2003); http://dx.doi.org/10.1063/1.1571228 (3 pages) | Cited 7 times

Online Publication Date: 21 April 2003

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A method for controlling the amplitude response of micromechanical oscillators is presented. The micromechanical oscillator is driven by two forces acting both in phase, a fixed sinusoidal force and a feedback force whose amplitude depends on the phase shift. This dependence exhibits a pronounced maximum when the phase shift is 90°, i.e., at the resonant frequency. Experiments performed with a microcantilever prove that this class of active control decreases the bandwidth of the amplitude response about two orders of magnitude. The noise of the microcantilever, mainly of a thermal nature, is not increased at resonance, and it is moderately increased at both sides of the amplitude peak. Moreover, the noise can be tuned by adjusting the ratio between the two driving forces. © 2003 American Institute of Physics.
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07.10.Cm Micromechanical devices and systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.10.Fq Vibration isolation
45.80.+r Control of mechanical systems

Nanotomography based on double asymmetrical Bragg diffraction

Marco Stampanoni, Gunther Borchert, Rafael Abela, and Peter Rüegsegger

Appl. Phys. Lett. 82, 2922 (2003); http://dx.doi.org/10.1063/1.1569428 (3 pages) | Cited 11 times

Online Publication Date: 21 April 2003

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Nondestructive investigations at ultrahigh spatial resolution can be carried out with synchrotron-based x-ray computer tomography. The performance of presently used detectors is restricted by scintillation properties, optical light transfer and charge coupled device granularity to a limit of 1 μm spatial resolution and efficiency of a few percent. A recently developed detector, called Bragg magnifier, exploits double asymmetrical Bragg diffraction to efficiently produce hard x-ray images with magnification factors up to 100×100 and pixel size of less than 200×200 nm2. Combining it with tomography, we obtained full volumetric information of a sample with spatial resolution well below 1 μm in less than 40 min.© 2003 American Institute of Physics.
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81.70.Tx Computed tomography
07.85.Tt X-ray microscopes
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