S. Martellucci | "Tor Vergata" University of Rome (original) (raw)
Papers by S. Martellucci
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010
Among insulating materials containing point defects, lithium fluoride (LiF) is a radiation-sensit... more Among insulating materials containing point defects, lithium fluoride (LiF) is a radiation-sensitive alkali halide well known in dosimetry and as active medium in light-emitting devices and lasers. Electronic point defects can be produced in LiF crystals and films by different kinds of radiation. Some of these electronic defects, known as colour centres, are optically active, with broad absorption and emission bands in the visible spectral range. Novel thin-film imaging detectors for extreme ultraviolet and soft X-rays, based on photoluminescence from aggregated colour centres in LiF, have been proposed and are currently under development, successfully extending their operation also in the hard X-ray region, up to 10 keV. Among the main peculiarities of LiF-based detectors, there are intrinsic high spatial resolution, in principle limited only by the point defect size, large field of view and wide dynamic range. These imaging detectors feature great versatility, as they can be grown in the form of thin films on different substrates by well-assessed physical deposition techniques. We present the promising results obtained using different X-ray laser-plasma sources in the field of nanotechnology, biology and in material science in view of future perspectives of research and development.
22nd Internation …, 2004
... 1'2~, Livio Casella~1~, Stefano Federico~2~, Teresa Lo Feudo~2~, Pasquale Gaudio~1~,... more ... 1'2~, Livio Casella~1~, Stefano Federico~2~, Teresa Lo Feudo~2~, Pasquale Gaudio~1~, Sergio Martellucci~1~, Maria Richetta~1 ... In addition, orographic uplift is overestimated over the Sila mountain and precipitation maximum is mislocated, even if a secondary maximum is ...
Molecular Crystals and Liquid Crystals, 1987
First and near second order phase transitions have been detected in 8CB lipuid crystal by gas cel... more First and near second order phase transitions have been detected in 8CB lipuid crystal by gas cell and microphone photoacoustic technique. A relaxation process in the smctic A phase has been oberved. Magnetic field effect in the nematic phase on the photoacoustic signal is reported. Microcalorimetric analysis of the technique may be obtained.
Review of Scientific Instruments, 2005
A simple intracavity system, based on electrical discharge, is used to control the shape and dura... more A simple intracavity system, based on electrical discharge, is used to control the shape and duration of transverse electric CO2 laser pulses. The clipping mechanism is based on active locking at the same frequency of the laser. The clipping apparatus can deliver gain switched spikes pulses between the temporal range of 100-110 ns. The peak power of the clipped signal is not reduced. The system is optimized to obtain a maximum efficiency equal to 1, and a jitter value of about 10 ns. In the article the characteristics of electrical system are described. Finally a scheme of the apparatus and experimental results are presented.
Journal of Physics D: Applied Physics, 1987
... Phys. 20 (1987) 1045-1048. Printed in the UK F Scudieri, M Marinelli, U Zammit and S Martellu... more ... Phys. 20 (1987) 1045-1048. Printed in the UK F Scudieri, M Marinelli, U Zammit and S Martellucci Dipartimento lngegneria Meccanica-2', Universita' di Roma 'Tor Vergata't, Via Orazio Raimondo 00173 Roma, Italy ... Mod. Phys. [5] Jackson WB, Amer NM, Boccara AC and Fournier ...
Applied Physics A Solids and Surfaces, 1991
Intensity-induced nonlinear absorption in several ionic crystals have been investigated at 308 nm... more Intensity-induced nonlinear absorption in several ionic crystals have been investigated at 308 nm by pulsed phototermal deflection in the prebreakdown region. The main mechanism of energy deposition is two or three photon absorption.
Applied Physics A Solids and Surfaces, 1991
Subgab absorption measurements carried out by photothermal deflection spectroscopy in semi-insula... more Subgab absorption measurements carried out by photothermal deflection spectroscopy in semi-insulating GaAs are used to study the concentration of defects found in as-grown and in heat treated material. Measurements carried out in ion-implanted and furnace-annealed samples prove to be a useful tool for monitoring the successful recovery of the ion implantation damage.
Proceedings of …, 1998
Recently the application of pulsed laser deposition (PLD) technique to grow different material of... more Recently the application of pulsed laser deposition (PLD) technique to grow different material of relevant interest for applications, especially in the field of micro devices, has been considered. We show that thin films of diamond like carbon (DLC) can be grown by ...
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010
Among insulating materials containing point defects, lithium fluoride (LiF) is a radiation-sensit... more Among insulating materials containing point defects, lithium fluoride (LiF) is a radiation-sensitive alkali halide well known in dosimetry and as active medium in light-emitting devices and lasers. Electronic point defects can be produced in LiF crystals and films by different kinds of radiation. Some of these electronic defects, known as colour centres, are optically active, with broad absorption and emission bands in the visible spectral range. Novel thin-film imaging detectors for extreme ultraviolet and soft X-rays, based on photoluminescence from aggregated colour centres in LiF, have been proposed and are currently under development, successfully extending their operation also in the hard X-ray region, up to 10 keV. Among the main peculiarities of LiF-based detectors, there are intrinsic high spatial resolution, in principle limited only by the point defect size, large field of view and wide dynamic range. These imaging detectors feature great versatility, as they can be grown in the form of thin films on different substrates by well-assessed physical deposition techniques. We present the promising results obtained using different X-ray laser-plasma sources in the field of nanotechnology, biology and in material science in view of future perspectives of research and development.
22nd Internation …, 2004
... 1'2~, Livio Casella~1~, Stefano Federico~2~, Teresa Lo Feudo~2~, Pasquale Gaudio~1~,... more ... 1'2~, Livio Casella~1~, Stefano Federico~2~, Teresa Lo Feudo~2~, Pasquale Gaudio~1~, Sergio Martellucci~1~, Maria Richetta~1 ... In addition, orographic uplift is overestimated over the Sila mountain and precipitation maximum is mislocated, even if a secondary maximum is ...
Molecular Crystals and Liquid Crystals, 1987
First and near second order phase transitions have been detected in 8CB lipuid crystal by gas cel... more First and near second order phase transitions have been detected in 8CB lipuid crystal by gas cell and microphone photoacoustic technique. A relaxation process in the smctic A phase has been oberved. Magnetic field effect in the nematic phase on the photoacoustic signal is reported. Microcalorimetric analysis of the technique may be obtained.
Review of Scientific Instruments, 2005
A simple intracavity system, based on electrical discharge, is used to control the shape and dura... more A simple intracavity system, based on electrical discharge, is used to control the shape and duration of transverse electric CO2 laser pulses. The clipping mechanism is based on active locking at the same frequency of the laser. The clipping apparatus can deliver gain switched spikes pulses between the temporal range of 100-110 ns. The peak power of the clipped signal is not reduced. The system is optimized to obtain a maximum efficiency equal to 1, and a jitter value of about 10 ns. In the article the characteristics of electrical system are described. Finally a scheme of the apparatus and experimental results are presented.
Journal of Physics D: Applied Physics, 1987
... Phys. 20 (1987) 1045-1048. Printed in the UK F Scudieri, M Marinelli, U Zammit and S Martellu... more ... Phys. 20 (1987) 1045-1048. Printed in the UK F Scudieri, M Marinelli, U Zammit and S Martellucci Dipartimento lngegneria Meccanica-2', Universita' di Roma 'Tor Vergata't, Via Orazio Raimondo 00173 Roma, Italy ... Mod. Phys. [5] Jackson WB, Amer NM, Boccara AC and Fournier ...
Applied Physics A Solids and Surfaces, 1991
Intensity-induced nonlinear absorption in several ionic crystals have been investigated at 308 nm... more Intensity-induced nonlinear absorption in several ionic crystals have been investigated at 308 nm by pulsed phototermal deflection in the prebreakdown region. The main mechanism of energy deposition is two or three photon absorption.
Applied Physics A Solids and Surfaces, 1991
Subgab absorption measurements carried out by photothermal deflection spectroscopy in semi-insula... more Subgab absorption measurements carried out by photothermal deflection spectroscopy in semi-insulating GaAs are used to study the concentration of defects found in as-grown and in heat treated material. Measurements carried out in ion-implanted and furnace-annealed samples prove to be a useful tool for monitoring the successful recovery of the ion implantation damage.
Proceedings of …, 1998
Recently the application of pulsed laser deposition (PLD) technique to grow different material of... more Recently the application of pulsed laser deposition (PLD) technique to grow different material of relevant interest for applications, especially in the field of micro devices, has been considered. We show that thin films of diamond like carbon (DLC) can be grown by ...