TOMA , Andrea

Recently, Cognitive Radio (CR) has been intended as an intelligent radio endowed with cognition which can be developed by implementing Artificial Intelligence (AI) techniques. Specifically, data-driven Self-Awareness (SA) functionalities, such as detection of spectrum abnormalities, can be effectively implemented as shown by the proposed...

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Here we report on a self-organised approach for the synthesis of transparent metal nanowire arrays based on defocused ion beam sputtering. The nanowire arrays supported on low cost dielectric substrates (glass slides) feature a dual functionality: they exhibit anisotropic conductivity, with sheet resistances which are reduced in comparison to...

The controlled production of nanostructures endowed with well-selected shapes and reduced dimensionality represents a multidisciplinary key activity in nanotechnology. In particular, a great effort is currently oriented at the development of metal nanoparticle arrays in order to exploit the strong field-enhancement effects associated with the...

Cognitive radio (CR) integrates results from software-defined radio (SDR), machine learning (ML), and neuroscience for smart radio transmission devices. SDR enables devices to be digitally and dynamically configured in online applications; methodologies and techniques developed to introduce self-awareness in existing systems can be based on ML....

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Method for the synthesis of an array of metal nanowires (w) capable of supporting localized plasmon resonances, wherein a metal film (M) deposited on a planar substrate (D) is irradiated with a defocused beam of noble gas ions (IB) under high vacuum, so that, with increasing ion doses: a corrugation is produced on the metal film surface, formed...

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Il brevetto descrive la sintesi auto-organizzata di Nanofili metallici supportati su substrati a basso costo di vetro. I nanofili metallici presentano bassa resistenza elettrica di strato inferiore ai 5 Ohm sq, buona trasparenza ottica. Vantaggiosamente inoltre i nanofili metallici supportano risonanza plasmoniche localizzate. Queste proprietà...

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Here we report on the development of an unconventional approach for the physical synthesis of laterally ordered self-organized arrays of metallic nanowires supported on nanostructured dielectric templates. The method, based on a combination of nanoscale patterning of the glass substrate by ion beam sputtering with shadow deposition of the metal...

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Nonequilibrium periodic nanostructures such as nanoscale ripples, mounds and rhomboidal pyramids formed on Rh(110) are particularly interesting as candidate model systems with enhanced catalytic reactivity, since they are endowed with steep facets running along nonequilibrium low-symmetry directions, exposing a high density of undercoordinated...

CO dissociation on rhomboidal faceted nanopyramids, produced on Rh(110) by fine-tuning of ion irradiation conditions, has been studied by high resolution core-level spectroscopy. We find that this morphology presents a large efficiency towards CO dissociation, a process which is inhibited on flat (110) terraces. We also measured the reactivity...

We report on the self-organized patterning of polycrystalline metal films supported on dielectric substrates using defocused Ar+ ion-beam sputtering at glancing incidence. The data demonstrate that a nonflat initial surface morphology does plays a critical role in triggering self-organization during the early stages, where the distribution of...

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We report on self-organized patterning of polycrystalline noble metal films, supported on dielectric substrates, by defocused Ar+ ion beam irradiation. The initial surface morphology affects the formation of nanostructures, forcing the growth of ripples with a lateral periodicity imposed by the pristine polycrystalline grain distribution. At...

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Here we report the experimental observation of circular dichroism in the second-harmonic field (800-400 nm conversion) generated by self-organized gold nanowire arrays with subwavelength periodicity (160 nm). Such circular dichroism, raised by a nonlinear optical extrinsic chirality, is the evident signature of the sample morphology. It arises...