Listar Departament: Física por fecha de publicación
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Dielectric losses measured in a sodium aluminosilicate glass by using electrical insulating barriers and non-isothermal experimental conditions
Elsevier (2008)Ac conductivity and dielectric losses are measured on a sodium aluminosilicate glass using various experimental conditions. Data obtained using metallic contacts and insulating barriers are compared. The influences of the ... -
Impedance of carrier injection at the metal-organic interface mediated by surface states in electron-only tris(8-hydroxyquinoline) aluminium (Alq<sub>3</sub>) thin layers
Elsevier (2008)Capacitance spectra of thin (<200 nm) Alq<sub>3</sub> electron-only devices have been measured as a function of bias voltage. Capacitance spectra exhibit a flat response at high frequencies (>10<sup>3</sup> Hz) and ... -
Reconfigurable RF-Waveform Generation Based on Incoherent-Filter Design
Institute of Electrical and Electronics Engineers (2008)Radio-frequency (RF) waveform generators are key devices for a variety of applications, including radar, ultra-wideband communications, and electronic test measurements. Following advances in broadband coherent pulsed ... -
Use of polar decomposition of Mueller matrices for optimizing the phase response of a liquid-crystal- on-silicon display
Optical Society of America (2008)We provide experimental measurement of the Mueller matrices corresponding to an on-state liquid-crystal-on-silicon display as a function of the addressed voltage. The polar decomposition of the Mueller matrices determines ... -
Physical electrochemistry of nanostructured devices
Royal Society of Chemistry (2008)This Perspective reviews recent developments in experimental techniques and conceptual methods applied to the electrochemical properties of metal-oxide semiconductor nanostructures and organic conductors, such as those ... -
Porosity dependence of electron percolation in nanoporus TiO2 layers
American Institute of Physics (2008)The electron diffusion coefficient at varying porosity has been determined in a series of nanostructured TiO2 films of different initial thicknesses. The porosity was changed by applying different pressures prior to ... -
Beyond the quasistatic approximation: Impedance and capacitance of an exponential distribution of traps
American Physical Society (2008)Electronic carriers in disordered organic and inorganic semiconductor materials, used in electronic, optoelectronic, and photovoltaic devices, are usually affected by an exponential distribution of localized states in the ... -
Interpretation of diffusion coefficients in nanostructured materials from random walk numerical simulation
Royal Society of Chemistry (2008)We make use of the numerical simulation random walk (RWNS) method to compute the ‘‘jump’’ diffusion coefficient of electrons in nanostructured materials via mean-square displacement. First, a summary of analytical results ... -
Ghost interference with classical partially coherent light pulses
American Physical Society (2008)The two-photon temporal coincidence detection amplitude obeys a pair of equations identical to those of classical partially coherent plane-wave pulses propagating in linearly dispersive media. These equations are also ... -
Interpretation of electron diffusion coefficient in organic and inorganic semiconductors with broad distributions of states
Royal Society of Chemistry (2008)The carrier transport properties in nanocrystalline semiconductors and organic materials play a key role for modern organic/inorganic devices such as dye-sensitized (DSC) and organic solar cells, organic and hybrid ... -
The ionic selectivity of large protein ion channels
Institut d'Estudis Catalans. Secció de Ciències i Tecnologia (2008)Large, highly conductive ion channels have a major functional role in the cell life cycle. They allow the exchange of charged and neutral solutes across the cell membrane envelope and regulate the influx of nutrients ... -
Inverted Solution Processable OLEDs Using a Metal Oxide as an Electron Injection Contact
Wiley-Blackwell (2008)A new type of bottom-emission electroluminescent device is described in which a metal oxide is used as the electron-injecting contact. The preparation of such a device is simple. It consists of the deposition of a thin ... -
Synthetic aperture single-exposure on-axis digital holography
Optical Society of America (2008)We present a system for reconstructing single-exposure on-line (SEOL) digital holograms with improved resolution using a synthetic aperture. Several recordings are made in order to compose the synthetic aperture, shifting ... -
20 GHz arbitrary radio-frequency waveform generator based on incoherent pulse shaping
Optical Society of America (2008)We demonstrate a new approach of photonically assisted radiofrequency (RF) waveform generation using a spectrally incoherent light source. The system is based on the so-called generalized frequency-to-time mapping ... -
Lossless equalization of frequency combs
Optical Society of America (2008)Frequency combs obtained by sinusoidal phase modulation of narrow-band continuous-wave lasers are widely used in the field of optical communications. However, the resulting spectral envelope of the comb is not at. ... -
Spatial-chirp compensation in dynamical holograms reconstructed with ultrafast lasers
American Institute of Physics (2008)A computer generated hologram (CGH) reconstructed with a sub-100-fs laser pulse at the focal plane of a conventional refractive lens experiences a large amount of spatial chirp. We report the shaping of a 12 fs laser pulsed ... -
Spectral analysis of femtosecond pulse diffraction through binary diffractive optical elements: theory and experiment
Optical Society of America (2008)We report on the changes in the spectrum of a femtosecond pulse originated by diffraction of the ultrashort waveform through a circularly symmetric binary diffractive optical element. The analysis is performed in the ... -
Electrodeposition and impedance spectroscopy characterization of ZnO nanowire arrays
Wiley-Blackwell (2008)An overview of the electrodeposition of ZnO nanowire arrays from the reduction of dissolved molecular oxygen in zinc chloride solutions was reported. In spite of the internal structure of ZnO which favours the anisotropic ... -
In situ investigation of dewaxing and sintering of stainless steel powder compacts by impulse excitation
Elsevier (2008)The dewaxing and sintering behaviour of 316LHD (high-density) powder metallurgy stainless steel grade have been in situ characterized by means of the high-temperature impulse excitation technique. The evolution of the E ... -
Fiber transmission and generation of ultrawideband pulses by direct current modulation of semiconductor lasers and chirp-to-intensity conversion
Optical Society of America (2008-02-01)Optical pulses generated by current modulation of semiconductor lasers are strongly frequency chirped. This effect has been considered pernicious for optical communications. We take advantage of this effect for the generation ...