author = "Tamayo de Miguel, Francisco Javier"

Encontrado 75 documentos, página mostrada 1 de 8

Study of the noise of micromechanical oscillators under quality factor

Description: The performance of devices based on micro- and nanomechanical oscillators depends critically on the quality factor (Q). The quality factor can be externally increased about two orders of magnitude by coherent amplification of the oscillation at resonance with a fast feedback amplifier. Here, theory ...
Language(s): Inglés

Energy dissipation in tapping-mode scanning force microscopy with low quality factors

Description: The phase angle of the cantilever oscillation in tapping mode scanning force microscopy can be related to the energy dissipated per oscillation period through an analytical model that assumes a sinusoidal movement of the cantilever [J. Tamayo and R. García, Appl. Phys. Lett. 73, 2926 (1998); J. P. C...
Language(s): Inglés

Nanomechanical systems: Inside track weighs in with solution

Description: The performance of biosensors that rely on tiny vibrating cantilevers suffers when they are operated in a liquid. The solution is to place the liquid inside the cantilever. ©2007 Nature Publishing Group. , Peer Reviewed
Language(s): Inglés

Structure of human chromosomes studied by atomic force microscopy

Description: In this work human chromosomes have been treated with RNase and pepsin to remove the layer of cellular material that covers the standard preparations on glass slides. This allows characterization of the topography of chromosomes at nanometer scale in air and in physiological solution by atomic force...
Language(s): Inglés

Structure of human chromosomes studied by atomic force microscopy: Part II. Relationship between structure and cytogenetic bands

Description: In the first part of this work, human chromosomes were characterized by atomic force microscopy (AFM) in air and in aqueous solution. The analysis of the images suggests that the last level of organization consists of a radial arrangement of chromatin loops which are anchored to a fiber which is fol...
Language(s): Inglés

Characterization of semiconductor heterostructures and quantum dots by friction force microscopy

Description: The capability of friction force microscopy to obtain compositional maps of semiconductor structures grown by molecular beam epitaxy was studied. Experiments on InP/InGaAs multiquantum wells determined a compositional spatial resolution of 3 nm. Additionally, variations in indium concentration small...
Language(s): Inglés

Relationship between phase shift and energy dissipation in tapping-mode scanning force microscopy

Description: 3 pages, 3 figures. , Force curves taken during a load–unload cycle show the presence of a hysteresis loop. The area enclosed by the loop is used to measure the energy dissipated by the tip-sample interaction in tapping-mode scanning force microscopy. The values of the energy loss obtained from force c...
Language(s): Inglés

Effects of elastic and inelastic interactions on phase contrast images in tapping-mode scanning force microscopy

Description: The dependence of phase contrast in tapping-mode scanning force microscopy on elastic and inelastic interactions is studied. The cantilever-tip ensemble is simulated as a driven, damped harmonic oscillator. It is found that for tip-sample elastic interactions, phase contrast is independent of the sa...
Language(s): Inglés

Optical sequential readout of microcantilever arrays for biological detection

Description: A technique for the readout of the nanomechanical response of multiple microcantilevers is presented. This combines the optical beam deflection technique and the scanning of a laser beam illuminating the cantilevers of an array sequentially. The individual motion of each microcantilever is obtained ...
Language(s): Inglés

Friction force microscopy characterization of semiconductor heterostructures

Description: Measurement of frictional forces in a scanning force microscopy has been applied to perform compositional characterization of semiconductor heterostructures. Semiconductor interfaces as well as multiquantum wells are resolved with 3 nm of spatial resolution. The chemical sensitivity of this method i...
Language(s): Inglés

Encontrado 75 documentos, página mostrada 1 de 8

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