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Horsley S.A.R.,University of Exeter | Wu J.-H.,Jilin University | Artoni M.,European Laboratory for Nonlinear Spectroscopy | Artoni M.,CNR Institute of Acoustics and Sensors Orso Mario Corbino | La Rocca G.C.,Normal School of Pisa
Physical Review Letters | Year: 2013

Reciprocity is fundamental to light transport and is a concept that holds also in rather complex systems. Yet, reciprocity can be switched off even in linear, isotropic, and passive media by setting the material structure into motion. In highly dispersive multilayers this leads to a fairly large forward-backward asymmetry in the pulse transmission. Moreover, in multilevel systems, this transport phenomenon can be all-optically enhanced. For atomic multilayer structures made of three-level cold Rb87 atoms, for instance, forward-backward transmission contrast around 95% can be obtained already at atomic speeds in the meter per second range. The scheme we illustrate may open up avenues for optical isolation that were not previously accessible. © 2013 American Physical Society. Source


Araneo R.,University of Rome La Sapienza | Lovat G.,University of Rome La Sapienza | Burghignoli P.,University of Rome La Sapienza | Falconi C.,University of Rome Tor Vergata | Falconi C.,CNR Institute of Acoustics and Sensors Orso Mario Corbino
Advanced Materials | Year: 2012

The piezopotential in floating, homogeneous, quasi-1D piezo-semiconductive nanostructures under axial stress is an anti-symmetric (i.e., odd) function of force. Here, after introducing piezo-nano-devices with floating electrodes for maximum piezo-potential, we show that breaking the anti-symmetric nature of the piezopotential-force relation, for instance by using conical nanowires, can lead to better nanogenerators, piezotronic and piezophototronic devices. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Comini E.,CNR Institute of Acoustics and Sensors Orso Mario Corbino
Sensors (Switzerland) | Year: 2013

Metal oxide nanowires are very promising active materials for different applications, especially in the field of gas sensors. Advances in fabrication technologies now allow the preparation of nanowires on flexible substrates, expanding the potential market of the resulting sensors. The critical steps for the large-scale preparation of reliable sensing devices are the elimination of high temperatures processes and the stretchability of the entire final device, including the active material. Direct growth on flexible substrates and post-growth procedures have been successfully used for the preparation of gas sensors. The paper will summarize the procedures used for the preparation of flexible and wearable gas sensors prototypes with an overlook of the challenges and the future perspectives concerning this field. © 2013 by the authors; licensee MDPI, Basel, Switzerland. Source


Kholmanov I.N.,CNR Institute of Acoustics and Sensors Orso Mario Corbino | Edgeworth J.,University of Texas at Austin | Cavaliere E.,University of Brescia | Gavioli L.,University of Brescia | And 2 more authors.
Advanced Materials | Year: 2011

Studies of the healing of artificial defects in the surface of highly oriented pyrolitic graphite (HOPG) by chemical vapor deposition (CVD) of acetylene show that only single-layer depth defects could be healed completely during the CVD treatment. A promising method is introduced for defect control in surfaces of graphite, graphene, and graphene-based materials, with important implications for their application. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Wu J.-H.,Jilin University | Horsley S.A.R.,University of Exeter | Artoni M.,European Laboratory for Nonlinear Spectroscopy | Artoni M.,CNR Institute of Acoustics and Sensors Orso Mario Corbino | La Rocca G.C.,Normal School of Pisa
Light: Science and Applications | Year: 2013

The typically tiny effect of radiation damping on a moving body can be amplified to a favorable extent by exploiting the sharp reflectivity slope at one edge of an optically induced stop-band in atoms loaded into an optical lattice. In this paper, this phenomenon is demonstrated for the periodically trapped and coherently driven cold 87Rb atoms, where radiation damping might be much larger than that anticipated in previous proposals and become comparable with radiation pressure. Such an enhancement could be observed even at speeds of only a few meters per second with less than 1.0% absorption, making radiation damping experimentally accessible. © 2013 CIOMP. All rights reserved. Source

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