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1,005 results on '"Lazzarino, M."'

1. Nano-Fabricated Free-Standing Wire-Scanners with Sub-Micrometer Resolution

Author

Orlandi, G. L., David, C., Ferrari, E., Guzenko, V. A., Hermann, B., Ischebeck, R., Prat, E., Ferianis, M., Penco, G., Veronese, M., Cefarin, N., Zilio, S. Dal, and Lazzarino, M.

Subjects
Physics - Accelerator Physics
Abstract

Diagnostics of the beam transverse profile with ever more demanding spatial resolution is required by the progress on novel particle accelerators - such as laser and plasma driven accelerators - and by the stringent beam specifications of the new generation of X-ray facilities. In a linac driven Free-Electron-Laser (FEL), the spatial resolution constraint joins with the further requirement for the diagnostics to be minimally invasive in order to protect radiation sensitive components - such as the undulators - and to preserve the lasing mechanism. As for high resolution measurements of the beam transverse profile in a FEL, wire-scanners (WS) are the top-ranked diagnostics. Nevertheless, conventional WS consisting of a metallic wire (beam-probe) stretched onto a frame (fork) can provide at best a rms spatial resolution at the micrometer scale along with an equivalent surface of impact on the electron beam. In order to improve the spatial resolution of a WS beyond the micrometer scale along with the transparency to the lasing, PSI and FERMI are independently pursuing the technique of the nano-lithography to fabricate a free-standing and sub-micrometer wide WS beam-probe fully integrated into a fork. Free-standing WS with a geometrical resolution of about 250 nm have been successfully tested at SwissFEL where low charge electron beams with a vertical size of 400-500 nm have been characterized. Further experimental tests carried out at SwissFEL at the nominal beam charge of 200 pC confirmed the resilience to the heat-loading of the nano-fabricated WS. In this work, details on the nano-fabrication of free-standing WS as well as results of the electron-beam characterization are presented.

Published
2019
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2. A DNA origami plasmonic sensor with environment-independent read-out

Author

Masciotti, V, Piantanida, L, Naumenko, D, Amenitsch, H, Fanetti, M, Valant, M, Lei, D, Ren, G, and Lazzarino, M

Subjects
Nanoscience & Nanotechnology
Abstract

DNA origami is a promising technology for its reproducibility, flexibility, scalability and biocompatibility. Among the several potential applications, DNA origami has been proposed as a tool for drug delivery and as a contrast agent, since a conformational change upon specific target interaction may be used to release a drug or produce a physical signal, respectively. However, its conformation should be robust with respect to the properties of the medium in which either the recognition or the read-out take place, such as pressure, viscosity and any other unspecific interaction other than the desired target recognition. Here we report on the read-out robustness of a tetragonal DNA-origami/gold-nanoparticle hybrid structure able to change its configuration, which is transduced in a change of its plasmonic properties, upon interaction with a specific DNA target. We investigated its response when analyzed in three different media: aqueous solution, solid support and viscous gel. We show that, once a conformational variation is produced, it remains unaffected by the subsequent physical interactions with the environment. [Figure not available: see fulltext.].

Published
2019

5. Resonant Transport in Nb/GaAs/AlGaAs/GaAs Microstructures

Author

Giazotto, F., Pingue, P., Beltram, F., Lazzarino, M., Orani, D., Rubini, S., and Franciosi, A.

Subjects
High Energy Physics - Phenomenology, Condensed Matter - Superconductivity
Abstract

Resonant transport in a hybrid semiconductor-superconductor microstructure grown by MBE on GaAs is presented. This structure experimentally realizes the prototype system originally proposed by de Gennes and Saint-James in 1963 in \emph{all}-metal structures. A low temperature single peak superimposed to the characteristic Andreev-dominated subgap conductance represents the mark of such resonant behavior. Random matrix theory of quantum transport was employed in order to analyze the observed magnetotransport properties and ballistic effects were included by directly solving the Bogoliubov-de Gennes equations., Comment: 7 pages REVTeX, 4 figures, to be published by World Scientific in Proceedings of International Symposium on Mesoscopic Superconductivity and Spintronics (NTT R&D Center Atsugi, Japan, March 2002)

Published
2002
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6. Andreev reflection in engineered Al/Si/InGaAs(001) junctions

Author

De Franceschi, S., Giazotto, F., Beltram, F., Sorba, L., Lazzarino, M., and Franciosi, A.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Complete suppression of the native n-type Schottky barrier is demonstrated in Al/InGaAs(001) junctions grown by molecular-beam-epitaxy. This result was achieved by the insertion of Si bilayers at the metal-semiconductor interface allowing the realization of truly Ohmic non-alloyed contacts in low-doped and low-In content InGaAs/Si/Al junctions. It is shown that this technique is ideally suited for the fabrication of high-transparency superconductor-semiconductor junctions. To this end magnetotransport characterization of Al/Si/InGaAs low-n-doped single junctions below the Al critical temperature is presented. Our measurements show Andreev-reflection dominated transport corresponding to junction transparency close to the theoretical limit due to Fermi-velocity mismatch, Comment: 9 pages, 3 figures

Published
1999

14. Soft X ray spectroscopies in liquids and at solid liquid interface at BACH beamline at Elettra

Author

Nappini, S., D Amario, L., Favaro, M., Dal Zilio, S., Salvador, F., Betz Güttner, E., Fondacaro, A., Pis, I., Romanzin, L., Gambitta, A., Bondino, F., Lazzarino, M., and Magnano, E.

Subjects
In situ operando soft X ray XAS, in situ operando electrochemical flow cells
Abstract

The Beamline for Advanced diCHroism BACH of the Istituto Officina dei Materiali Consiglio Nazionale delle Ricerche IOM CNR , operating at Elettra synchrotron in Trieste Italy , works in the extreme ultra violet EUV soft x ray photon energy range with selectable light polarization, high energy resolution, brilliance and time resolution. The beamline offers a multi technique approach for the investigation of the electronic, chemical, structural, magnetic, and dynamical properties of materials. Recently one of the three end stations has been dedicated to experiments based on electron transfer processes at the solid liquid interfaces and during photocatalytic or electrochemical reactions. Suitable cells to perform soft x ray spectroscopy in the presence of liquids and reagent gases atambient pressure were developed. Here we present two types of static cells working in transmission or in fluorescence yield, and an electrochemical flow cell which allows to carry out cyclic voltammetry in situ, electrodeposition on a working electrode WE and to study chemical reactions in operando conditions. Examples of X ray absorption spectroscopy XAS measurements performed in ambient conditions and during electrochemical experiments in liquids are presented

Published
2021

31. Evidence of material mixing during local anodic oxidation nanolithography

Author

Mori, G., Lazzarino, M., Ercolani, D., Biasiol, G., Heun, S., and Locatelli, A.

Subjects
Oxidation-reduction reaction -- Analysis, Nanolithography -- Methods, Gallium arsenide semiconductors -- Design and construction, Physics
Abstract

The chemical properties of nanostructures fabricated by local anoidic oxidation (LAO) on epitaxial GaAs/AlAs/GaAs layers is investigated. The results cannot be explained within the framework of the commonly accepted mechanism that describes the growth of the LAO oxides in terms of diffusion of oxygen-rich ions through the growing oxide.

Published
2005

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