55 research outputs found
Tunnelling in quantum superlattices with variable lacunarity
Quantum fractal superlattices are microelectronic devices consisting of a
series of thin layers of two semiconductor materials deposited alternately on
each other over a substrate following the rules of construction of a fractal
set, here, a symmetrical polyadic Cantor fractal. The scattering properties of
electrons in these superlattices may be modeled by using that of quantum
particles in piecewise constant potential wells. The twist plots representing
the reflection coefficient as function of the lacunarity parameter show the
appearance of black curves with perfectly transparent tunnelling which may be
classified as vertical, arc, and striation nulls. Approximate analytical
formulae for these reflection-less curves are derived using the transfer matrix
method. Comparison with the numerical results show their good accuracy.Comment: 12 pages, 3 figure
Toward an experimental proof of superhydrophobicity enhanced by quantum fluctuations freezing on a broadband-absorber metamaterial
Previous theoretical works suggested that superhydrophobicity could be
enhanced through partial inhibition of the quantum vacuum modes at the surface
of a broadband-absorber metamaterial which acts in the extreme ultraviolet
frequency domain. This effect would then compete with the classical
Cassie-Baxter interpretation of superhydrophobicity. In this article, we first
theoretically establish the expected phenomenological features related to such
a kind of "quantum" superhydrophobicity. Then, relying on this theoretical
framework, we experimentally study patterned silicon surfaces on which
organosilane molecules were grafted, all the coated surfaces having similar
characteristic pattern sizes but different profiles. Some of these surfaces can
indeed freeze quantum photon modes while others cannot. While the latter ones
allow hydrophobicity, only the former ones allow for superhydrophobicity. We
believe these results lay the groundwork for further complete assessment of
superhydrophobicity induced by quantum fluctuations freezing.Comment: 10 pages, 5 figures, final version, accepted for publication in
Journal of Applied Physic
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A Scaleable and License Free 5G Internet of Radio Light Architecture for Services in Train Stations
In this paper we present a 5G Internet Radio-
Light (IoRL) architecture for underground train stations that
can be readily deployed because it utilizes unlicensed visible light
and millimeter wave part of the spectrum, which does not require
Mobile Network Operator (MNO) permission to deploy and
which is used to provide travelers with accurate location,
interaction, access to Internet and Cloud based Services, such as
high resolution video on a Tablet PC. The paper describes the
train station use cases and the IoRL architecture.European Commissio
A Scalable and License Free 5G Internet of Radio Light Architecture for Services in Homes & Businesses
In this paper we present a 5G Internet Radio-Light
(IoRL) architecture for homes that can be readily deployed
because it utilizes unlicensed visible light and millimeter wave
part of the spectrum, which does not require Mobile Network
Operator (MNO) permission to deploy and which is used to
provide inhabitants of houses with accurate location, interaction,
access to Internet and Cloud based services such as high
resolution video on a Tablet PC. The paper describes the home
use cases and the IoRL architecture.EU Horizon 202
Carboidratos não estruturais em tubérculos de batata recondicionados após o armazenamento sob diferentes temperaturas
Towards medical diagnostic chips with monolithically integrated optics in glass substrates
International audienceOur objective is to develop miniaturised LabâonâaâChip (LOC) analysers, for medical diagnostics and for monitoring of the health status of ill persons. The complete system will make use of disposable chip sensors of the size of a credit card and a control unit of the size of a book. The principle of sensors will be based on the determination of the concentration of âprotein markersâ, which are related to various illnesses. In order to achieve this objective, it is necessary to integrate some optical components in the Chip. In this contribution we describe a successful development of electrophoretic separation LOC with monolithically integrated optics. These optical components are used for the excitation and for the detection of the fluorescence signal from separated bioâmolecules. The developed module can be considered as one of the main buildingâblock of the completed diagnostic Chip. (© 2007 WILEYâVCH Verlag GmbH & Co. KGaA, Weinheim
Application of microfluidic chip with integrated optics for electrophoretic separations of proteinsâ
International audienceThis paper describes the fabrication, the characterization and the applications of a capillary electrophoresis microchip. This hybrid device (glass/PDMS) features channels and optical waveguides integrated in one common substrate. It can be used for electrophoretic separation and fluorimetric detection of molecules. The microfluidic performance of the device is demonstrated by capillary zone and gel electrophoresis of proteins
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