A5063256103- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Semiconductor Quantum Structures and Devices
- Physics of Superconductivity and Magnetism
- Nanowire Synthesis and Applications
- Superconducting and THz Device Technology
- Quantum and electron transport phenomena
- Laser-Ablation Synthesis of Nanoparticles
- Ion-surface interactions and analysis
- Bone Tissue Engineering Materials
- Magnetic properties of thin films
- Force Microscopy Techniques and Applications
- Copper Interconnects and Reliability
- Magnetic Properties and Applications
- Quantum Dots Synthesis And Properties
- High-Temperature Coating Behaviors
- nanoparticles nucleation surface interactions
- Magnesium Alloys: Properties and Applications
- Metallic Glasses and Amorphous Alloys
- Photonic and Optical Devices
- Molecular Junctions and Nanostructures
- Near-Field Optical Microscopy
- Surface Roughness and Optical Measurements
- Optical Coatings and Gratings
- Thermal Radiation and Cooling Technologies
Georgetown University
2022
Institute for Fiscal Studies
2022
Rutgers, The State University of New Jersey
2022
Boston University
2022
University of Pennsylvania
2022
The Econometric Society
2022
Fusion for Energy
2018
Universidad Politécnica de Madrid
2014
IMDEA Energy Institute
2012
Centro Nacional de Microelectrónica
2008-2012
Based on an already tested laboratory procedure, a new magnetron sputtering methodology to simultaneously coat two-sides of large area implants (up ~15 cm2) with Ti nanocolumns in industrial reactors has been developed. By analyzing the required growth conditions setup, geometry and have proposed semi-industrial scale reactor. A bone plate (DePuy Synthes) pseudo-rectangular extracted from patient were coated following methodology, obtaining that their osteoblast proliferation efficiency...
We report on the structural and electrical characterization of Mo thin films deposited at room temperature by RF magnetron sputtering. The effect power morphology residual stress is analyzed. are under compressive consist densely packed columns with a lateral size order 20 nm. stress, critical temperature, resistivity found to rise when increasing ejected ion energy during sputtering process. changes in discussed terms observed changes.
We investigate the electronic and optical properties of InAs double quantum dots grown on GaAs $(001)$ laterally aligned along $[110]$ crystal direction. The emission spectrum has been investigated as a function lateral electric field applied dot pair mutual axis. number confined electrons can be controlled with external bias, leading to sharp energy shifts which we use identify from neutral charged exciton complexes. Quantum tunneling these is proposed explain reversed ordering trion lines...
Molybdenum is a low Tc, type I superconductor whose fundamental properties are poorly known. Its importance as an essential constituent of new high performance radiation detectors, the so-called transition edge sensors (TESs) calls for better characterization this superconductor, especially in thin film form. Here we report on study basic superconducting features Mo films function their thickness. The resistivity found to rise and critical temperature decreases decreasing thickness,...
This work presents a selective ultraviolet (UV)-ozone oxidation-chemical etching process that has been used, in combination with laser interference lithography (LIL), for the preparation of GaAs patterned substrates. Further molecular beam epitaxy (MBE) growth InAs results ordered InAs/GaAs quantum dot (QD) arrays high optical quality from first layer QDs formed on substrate. The main result is development patterning technology allows engineering customized geometrical displays same as those...
We report on the fabrication and characterization of Mo films, Mo/Au Mo/Cu bilayers for Transition Edge Sensors (TES). The conditions (at room temperature) have been varied to achieve layers with required properties TES applications. dependence their functional (i.e. electrical resistivity superconducting critical microstructure (grain size, stress) is investigated.
The first dark characterization of a thermometer fabricated with our Mo/Au bilayers to be used as transition edge sensor is presented. High-quality, stress-free Mo layers, whose thickness tune the critical temperature <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$(T_{C})$</tex></formula> down 100 mK, are deposited by sputtering at room Notation="TeX">$(RT)$</tex></formula> on Notation="TeX">...
Gas-phase synthesis of nanoparticles with different structural and chemical distribution is reported using a circular magnetron sputtering in an ion cluster source by applying high-power impulses. The influence the pulse characteristics on final deposit was evaluated Au nanoparticles. results have been compared more common direct current approach. In addition, it shown for first time that impulses based gas aggregation sources allows growth binary nanoparticles, CoAu this case, variety...
Recent developments in dynamic Atomic Force Microscopy where several eigenmodes are simultaneously excited liquid media proving to be an excellent tool biological studies. Despite its relevance, the search for a reliable, efficient, and strong cantilever excitation method is still progress. Herein, we present theoretical modeling experimental results of different actuation methods compatible with operation environments: ideal acoustic, homogeneously distributed force, applied torque (MAC...
The deposition of gold-colored titanium nitride films without applying substrate heating is significant interest due to the increasing demand for decorative coatings on temperature-sensitive three-dimensional substrates. Here, energetic impact Nb1+ ions during TiN was achieved within a bipolar high-power impulse magnetron sputtering discharge operating Nb target. A separate target operated with direct current in same reactive argon–nitrogen mixture. This process aimed achieve dense...
A nanogap fabrication process using strained epitaxial III-V beams is reported. The highly reproducible, allowing parallel and size control. are fabricated from MBE-grown (GaAs/GaP)/AlGaAs heterostructures, standard e-beam lithography wet etching. During the etching process, relaxation of accumulated stress at heterostructure produces a controlled beam breakage previously defined notch. After breakage, relaxed strain proportional to length, starting structure similar mechanically adjustable...
An actuation mode is presented to drive the mechanical oscillation of cantilevers for dynamic atomic force microscopy. The method based on direct excitation coated with amorphous Fe–B–N thin films, by means film magnetostriction, i.e., dimensional change in when magnetized. These magnetostrictive films exhibit soft magnetic properties, excellent corrosion resistance liquid environments, nearly zero accumulated stress properly deposited, and good chemical stability. We present low noise high...
In situ stress measurements during sputtering deposition of amorphous Fe80B20 films are used to control their and magnetoelastic properties. The substrate curvature induced by the deposited film is measured optically growth quantitatively related accumulated stress. resulting magnetic properties later correlated with for a wide range pressures [(2−25)×10−3 mbar]. A significant tensile develops at film-substrate interface early stages (initial 2–3 nm). At critical thickness, transition...
Mo/Au bilayers are among the most suitable materials to be used as transition-edge sensors (TES) in cryogenic microcalorimeters and bolometers, developed, other fields, for space missions. For this purpose thermal stability of TES at temperatures below 150 °C is a critical issue.
This manuscript introduces and experimentally demonstrates a novel concept of selective metal ion irradiation by combining bipolar HIPIMS with conventional DC magnetron sputtering operation simple biasing. The addition the positive pulse to discharge accelerates predominantly ions created during negative phase an energy proportional amplitude ionization state. Two distinct elements large difference in atomic mass (Cr Nb) are used on this work irradiate TiAlN matrix which is being deposited...
The X-ray spectroscopy telescope Athena has been designed to implement the science theme "the hot and energetic universe", selected by European Space Agency as second large mission of its Cosmic Vision program. X-IFU, one two interchangeable focal plane instruments Athena, is a high resolution spectrometer made array Transition Edge Sensors. Two options are under consideration for X-IFU microcalorimeters: Ti/Au bilayers or Mo/Au bilayers. Here we report on our efforts develop Mo/Au-based...