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We report the application of an all-fiber setup for spectral reflectivity measurements on rectangular glass micro-capillaries, in view of their application as micro-opto-fluidic devices for detection of solution concentration. We tested two kind of capillaries, both with 50 μ m × 500 μ m cross section but different wall thickness, respectively equal to 35 μ m and 50 μ m. Optical readout was provided...
In this work gold and silver nanoparticles (AuNPs and AgNPs), functionalized with the n-conjugated dithiol, 9,9-didodecyl-2,7-bis-thiofluorene (FL) were prepared and their optical and electronic properties were investigated. The obtained nanoparticles showed low diameters and low size dispersion (4–5 nm), a very good solubility in organic solvents and can be easily deposited as stable film on several...
A new source of high-power broadband THz radiation has been built in Naples, Italy. The source is based on two-colours mixing of ultrashort femtosecond light pulses. The source can deliver THz frequencies in the range 0.1–30 THz, with pulses of sub-picosecond time duration and having a peak electric field amplitude as high as 1 MV/cm. A characterization of the source is given in this work together...
We report the experimental characterization of the second harmonic generated in optically poled fibers. The fibers were poled by using both linearly and circularly polarized pumps at the wavelength of 1064 nm. Polarization and transverse profile of the light generated at 532 nm depend on the polarization of the input fundamental beam at 1064 nm used to pole the fiber. The generated second harmonic...
Here we present our results in the fabrication of Long Period Gratings (LPGs), through the Electric Arc Discharge technique, in standard communication optical fibers and two different optical fibers made of pure-silica core and Fluorine-doped cladding. In last years, F-doped fibers have been studied, since they represent a suitable solution in high-energy applications, due to their radiation hard...
The reduction process of the graphene oxide colloidal dispersion in N-methyl-2-pyrrolidone by microwave heating is presented. Graphene oxide (GO) and reduced graphene oxide (tr-GO) stable dispersions have been characterized by scanning electron microscopy (SEM), UV-visible absorption and emission spectroscopies, and Fourier transform infrared spectroscopy. It results from the emission spectroscopy...
In this study, we show an extrinsic pressure sensor consisting in a Fabry-Perot cavity realized on single mode fiber tip. The first mirror is given by the end of the optical fiber, that accurately cut, acts as reflecting mirror. The other one is made of a thin and elastic metallic diaphragm. Stressed by an external pressure, the metallic diaphragm bends, changing the optical cavity length and, therefore,...
Superconducting nanowire single photon detectors (SNSPDs) are the detectors of choice in quantum optics applications due to their leading performances. To exploit their performances, great care must be devoted to efficiently couple light from a single-mode fiber to their small area, ∼10 μm in size, at cryogenic temperature (∼3K). In addition, to further improve the SNSPDs functionality, implementing...
This paper aims to describe a Web Spatial Decision Support System (Web SDSS) for Integrated Coastal Zone Management (ICZM). Geographic Information System (GIS) is one of the most common tools used to monitor and analyze the territorial and morphologic changes of coastal and marine ecosystems. Decision Support System (DSS) is a computer-based tools developed to support decision analysis and participatory...
We investigate the influence of surface roughness and show angularly resolved measurements performed using a fiber-coupled Terahertz time domain spectroscopy system. The study aim at defining the range of roughness, which allow to exploit THz reflectometry in order to collect micro-tomographic information.
Studies about sleep deprivation in Space suggest the desynchronization of astronauts' circadian rhythm during the mission. This alteration could be caused by the absence of natural light variation in Space, together with low illuminance levels existing within the habitat. The paper proposes a new dynamic lighting approach suited for Space habitats reproducing Earth daylight variation by means of electrical...
Optical sensors have been extensively studied in order to develop new methods of investigation for different materials. In particular, light scattering and absorption in biological tissues have been investigated for diagnostic and therapeutic applications. Here we present an experimental work devoted to develop a new kind of optical sensor based on the random laser emission. Such an optical phenomenon...
The SCF_Lab (Satellite/lunar/GNSS laser ranging/altimetry and Cube/microsat Characterization Facilities Laboratory) is a brand new ISO 7 Clean Room, dedicated to design, characterization and modelling of the space segment of Satellite Laser Ranging (SLR), Lunar Laser Ranging (LLR) and Planetary Laser Ranging and Altimetry (PLRA) for industrial and scientific applications. The role of SCF_Lab is fundamental...
One of the most exciting challenges of neurosciences in the last few years is the real-time recording of neuronal activity with single cell resolution across the entire brain. Thanks to the use of optical methods, together with animal models in which the whole encephalon is optically accessible, this goal is getting within reach. In this work, we use a transgenic zebrafish line expressing the genetically...
Plant roots of Arabidopsis thaliana can be imaged at high spatial resolution on a large field of view by light sheet fluorescence microscopy, such as Selective Plane Illumination Microscopy (SPIM). Root growth can be observed in 3D over various time scales, in controlled, quasi-physiological conditions. We show that SPIM combined with Forster Resonance Energy Transfer is well suited to observe calcium...
Introduction Stroke affects 15 million people worldwide every year and is one of the leading causes of long-term disability [l, 2]. Plasticity is the ability of the brain of going through structural and functional modification in order to achieve the most effective recovery after stroke [3, 4].
The programmability of optical systems has a key role towards the integration of data and control plane to support advanced functionalities in flexible/elastic and highly scalable software defined networks (SDN). In this work, we illustrate the concept of SDN-enabled optical transmission adopting programmable data plane. Particularly, we focus on the programmability aspects of SDN-enabled optical...
In this paper, we present the optical elements needed for the fabrication of a wavelength selective silicon photonic integrated switching matrix We focus on the device proposed in the European project IRIS, which is a wavelength division multiplexing (WDM) transponder aggregator. It implements a colourless, directionless, and contentionless reconfigurable optical add/drop multiplexer (ROADM) node...
A transmission scheme based on the modulation of information onto the nonlinear spectrum of a signal is analyzed through simulation and the impact of discretization choices, boundary conditions and block length is investigated. It turns out that the spectral efficiency decrease due to the redundant symbols required to fulfil the requirements about boundary conditions cannot be mitigated by increasing...
In this work we show some experimental approaches concerning dynamic network management based on Carrier Ethernet forwarding that result very suitable in the context of 5G heterogeneous networks. We show how to change logical paths to feed different network segments with very fast time and either null or negligible packet losses. We also show how to adopt a central unit (orchestrator) to automatically...
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