10 research outputs found
Emerging Applications of Whispering Gallery Mode Photonic Resonators
No full textWhispering Gallery Mode photonic resonators are emerging as key building blocks in many application fields especially because their resonant frequency is very sensitive to the variation of any physical or geometrical parameter. The basic properties and the applications of these resonators are discussed in this paper, with a specific attention to three very important application fields, i.e. Space, health-care, and environment monitoring
System test of a new optoelectronic gyro based on an InP ring resonator with a Q factor of one million
No full textExperimental countermeasures to reduce the backscattering noise in an InP hybrid optical gyroscope
No full textMiniaturization of the currently available medium- and high-performance angular velocity sensors is crucial for aerospace and defense industry. To face this technological challenge, we are investigating a new gyro, called gyroscope-on-chip (GoC), based on the InP photonic integrated circuits technology. The sensor we refer includes a passive ring resonator with a Q greater than one million and several optical/optoelectronic components all monolithically integrated on a single InP chip. Recent progress on the demonstration of the GoC is reported in this paper. In particular, the configuration of the readout circuit and the countermeasures against the backscattering noise are discussed
Reconfigurable optical beamformer with graphene-based fine-tunable optical delay line
No full textAn integrated graphene-based fine-tunable optical delay line in silicon nitride has been designed. A high optical delay time up to 920 ps has been calculated with a device footprint A ~ 4 mm2. The device includes two graphene-based Mach-Zehnder interferometer (MZI) switches and two vertically-stacked microring resonators. Graphene capacitors have been integrated in the optical delay line to exploit the electro-optic effect aiming at fast tuning (response time of few nanoseconds) with a low power dissipation. Such performance, together with optical loss α < 27 dB, makes this device suitable for beam-steering up to 20 radiating elements, with an angle of ±20° in the azimuth direction, of a tile in a phased-array antenna included in an X-band SAR
Impiantistica frigorifera innovativa con fluidi frigorigeni naturali
No full textNella seguente nota vengono esposte le linee programmatiche del progetto nazionale di ricerca sulle
“Tecnologie innovative sulla frigoconservazione con fluidi refrigeranti naturali”e l’attività finora
svolta dalle unità operative afferenti al progetto. Pertanto, dopo una sintetica introduzione sugli
effetti prodotti dall’emissione di fluidi refrigeranti sull’ambiente, sono stati riepilogati i regolamenti
emessi dagli accordi internazionali stipulati fra i vari Stati ed i limiti imposti dalla legislazione
europea sull’uso dei gas fluorurati.
Il progetto di ricerca ha previsto la costruzione ed il monitoraggio di tre impianti frigoriferi pilota
che utilizzano i due gas naturali di maggiore interesse e cioè l’anidride carbonica e l’aria.
Sono stati, quindi, esposti i criteri generali di progettazione degli impianti e la loro definizione
costruttiva, nonché le metodiche con cui si ritiene di valutarne l’efficienz
System test of an optoelectronic gyroscope based on a high Q-factor InP ring resonator
No full textThe experimental results of the system test of an optical resonant passive gyroscope based on a high Q-factor ring resonator in InP technology are reported. The open loop configuration based on the phase modulation was preferred among the analyzed configuration options, especially because it is potentially suitable for the monolithic integration of the entire sensor on a single chip. The setup components are described with a special emphasis on a custom digital readout board based on a field-programmable gate array. The board processes the input signals according to the proportional-integral algorithm which has been implemented through an optimized firmware. For the system test, the sensor rotation has been simulated using two properly driven acousto-optic modulators. The results reported here prove the gyro functionality and are a good starting point for the full development of the sensor
Rigorous design of an ultra-high Q/V photonic/plasmonic cavity to be used in biosensing applications
No full textA hybrid device based on a 1D PhC dielectric cavity vertically coupled to a plasmonic slot is proposed for use in biosensing applications. Under efficient coupling conditions between the Bloch mode in the 1D PhC dielectric cavity and the surface plasmon polaritons mode in the metal slot, an ultra-high Q/V ratio (similar to 10(7)(lambda/n)(-3)) has been achieved with a remarkable resonance transmission T (=47%), due to high spectral and spatial confinement in the cavity. The rigorous design process of the cavity, including the influence of geometrical and physical parameters on its performance, has been carried out using the 3D Finite Element Method. A strong light-matter interaction was observed, making the photonic-plasmonic cavity suitable for biosensing and, in particular, for optical trapping of living matter at nanoscale, such as proteins and DNA sections, as required in several biomedical applications. (C) 2015 Elsevier Ltd. All rights reserved
Modelling and design of a new nanophotonic/plasmonic resonant biosensor for optical trapping and monitoring of nanoparticles
No full text
Advanced Logistics for people and goods mobility: mathematical models and trials related to new protocols for mail delivery (LAMRECOR project)
No full textLAMRECOR project, funded by MiUR with Poste Italiane as prime
contractor, aims at demonstrating an innovative integrated system for advanced
logistics targeted at minimizing the environmental impact of the fleet of vehicles,
optimizing the productive processes, improving the safety of the postal workers, and
developing new logistics procedures for mail delivery. For enhancing the safety of
the workers, an integrated sensors system has been designed. The system includes an
on-board unit to control the appropriate use of personal protective equipment,
improving protection of the postmen also through the activation of an emergency
call in case of accident, and to monitor functional performances of the vehicles. A
prototype of the sensors system has been developed confirming the design results.
Some mathematical models for studying the driving behaviour have been also
analysed. A Decision Support System for the management of the logistics
infrastructure has been developed and tested and data mining algorithms have been
studie
