A5016118049- Photonic and Optical Devices
- Particle Detector Development and Performance
- Optical Network Technologies
- Organic Electronics and Photovoltaics
- Radiation Detection and Scintillator Technologies
- Semiconductor Lasers and Optical Devices
- Advancements in Semiconductor Devices and Circuit Design
- Conducting polymers and applications
- Neural Networks and Reservoir Computing
- Analytical Chemistry and Sensors
- CCD and CMOS Imaging Sensors
- Microfluidic and Bio-sensing Technologies
- Advanced Photonic Communication Systems
- Organic Light-Emitting Diodes Research
- Analog and Mixed-Signal Circuit Design
- Advanced Semiconductor Detectors and Materials
- Semiconductor materials and devices
- Particle physics theoretical and experimental studies
- Neuroscience and Neural Engineering
- High-Energy Particle Collisions Research
- Mechanical and Optical Resonators
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Memory and Neural Computing
- Nuclear Physics and Applications
- Diamond and Carbon-based Materials Research
Politecnico di Milano
2015-2024
Scuola Superiore Sant'Anna
2023
Stanford University
2023
Consorzio di Bioingegneria e Informatica Medica
2014-2021
Center for Nano Science and Technology
2011-2021
Italian Institute of Technology
2012-2021
IMEC
2020
Aristotle University of Thessaloniki
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2001-2020
Weatherford College
2020
We report on measurements of low-mass electron pairs in 450 GeV p-Be, p-Au, and 200 GeV/nucleon S-Au collisions at central rapidities. For the proton induced interactions, spectra are, within systematic errors, satisfactorily explained by from hadron decays, whereas system an enhancement over hadronic contributions a factor 5.0±0.7(stat)±2.0(syst) invariant mass range 0.2<m<1.5GeV/c2 is observed. The properties excess suggest that it arises two-pion annihilation ππ→e+e−.Received 2 March...
Abstract Propagation of light beams through scattering or multimode systems may lead to the randomization spatial coherence light. Although information is not lost, its recovery requires a coherent interferometric reconstruction original signals, which have been scrambled into modes system. Here we show that can automatically unscramble optical arbitrarily mixed in waveguide, undoing and mixing between mesh silicon photonics tuneable beam splitters. Transparent detectors integrated photonic...
The paper presents a very high sensitivity transimpedance amplifier in standard CMOS 0.35 mum technology suited for sensing current signals from molecular and nanodevices systems. circuit, based on an integrator followed by differentiator configuration, features i) low-noise time-continuous feedback loop to cope with possible standing currents the device under test as few tens of nA without limiting signal dynamic range; ii) active current-reducers implement value equivalent resistances...
Bulk-heterojunction based organic photodetectors are fabricated by means of drop-on-demand inkjet printing with vertical topology, inverted structure, and small footprint (about 100 μm x μm). Due to optimization the deposition technique, an external quantum efficiency in excess 80% at 525 nm a -3dB bandwidth few tens kHz is achieved.
Field effect transistors require an Ohmic source contact and drain for ideal operation. In many real situations, however, specifically in organic devices, the injection of charge carriers from metals into semiconductors can be inefficient process that is non-Ohmic. This has adverse impact on performance thin film makes analysis electrical measurements a complex task because effects need to disentangled transistor properties. paper deals with non-Ohmic contacts modeling gives specific rules...
Photonic technologies lack non-invasive monitoring tools to inspect the light inside optical waveguides. This is one of main barriers large scale integration, even though photonic platforms are potentially ready host thousands elements on a single chip. Here, we demonstrate observation in silicon photonics devices by exploiting photon interaction with intra-gap energy states localized at waveguide surface. Light intensity monitored measuring electric conductance core through capacitive...
As photonics moves from the single-device level toward large-scale, integrated, and complex systems on a chip, monitoring, control, stabilization of components become critical.We need to monitor circuit non-invasively apply simple, fast, robust feedback control.Here, we show non-invasive monitoring control high-quality-factor silicon (Si) photonic resonators assisted by transparent detector that is directly integrated inside cavity.Control operations are entirely managed CMOS microelectronic...
All-organic, fully-printed and semitransparent photodetectors with a broad wavelength band response, based on ternary blend comprising narrow band-gap small molecules, are demonstrated. The semiconducting polymer allows for the optimal printing of suppressing strong phase segregation, uncontrolled crystallization. insertion suitable interlayer enables adoption polymer, transparent, top bottom printed electrodes, thus making light detection possible from both device sides. As service to our...
Pseudo-resistor circuits are used to mimic large value resistors and base their success on the reduction of occupied areas with respect physical devices equal value. This article presents an optimized architecture pseudo-resistor, made in standard CMOS 0.35 μm technology bias a low-noise transimpedance amplifier for high-sensitivity applications frequency range 100 kHz-10 MHz. The was selected after critical review different topologies implement high-value resistances MOSFET transistors,...
We demonstrate a method for quantitatively probing the local low-frequency dielectric constant of thin insulating films by nanoscale capacitance microscopy. The calibrated capacitance-distance curves are measured on film and analyzed using tip-sample model here proposed. Applied to SiO2 as small 1×1μm2 area 20–30nm thickness, gives submicron scale in agreement with value determined large scale. observed precision is set noise level instrument tip radius.
We demonstrate an organic photodetector showing high detectivity (3.4×1012 Hz0.5 cm/W) at a wavelength of 700 nm, based on squaraine/phenyl-C61-butyric-acid-methyl-ester bulk-heterojunction active material. This result is achieved by suppressing the device dark currents while simultaneously preserving its external quantum efficiency, as 15% nm. To this aim, thin cross-linked film poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene] exploited to suppress electron injection from anode...
We present the experimental demonstration of low-frequency dielectric constant imaging single-layer supported biomembranes at nanoscale. The image has been quantitatively reconstructed by combining thickness and local capacitance obtained using a scanning force microscope equipped with sub-attofarad detector. This work opens new possibilities for studying bioelectric phenomena properties biological membranes
A surface modification of interdigitated gold microelectrodes (IDEs) with a doped polypyrrole (PPy) film for detection dopamine released from populations differentiated PC12 cells is presented. thin PPy layer was potentiostatically electropolymerized an aqueous pyrrole solution onto electrode surfaces. The conducting polymer during electropolymerization by introducing counter-ions in the monomer solution. Several were tested and resulting modifications characterized electrochemically to find...
The first integrated CMOS monolithic sensor system for on-chip capacitive detection of micrometric airborne particulate matter (PM) is presented. chip based on a 32 channel lock-in architecture allowing dust collection area 1.15 mm2 where interdigitated differential microelectrodes, fabricated with the top metal and directly exposed to air, allow single particle sensitivity. preamplifier input capacitance significantly minimized thanks electrode-amplifier proximity proper partitioning...
Abstract Flexible optical networks require reconfigurable devices with operation on a wavelength range of several tens nanometers, hitless tuneability (i.e. transparency to other channels during reconfiguration), and polarization independence. All these requirements have not been achieved yet in single photonic integrated device this is the reason why potential photonics still largely unexploited nodes communication networks. Here we report fully-reconfigurable add-drop silicon filter, which...
A spectrum analyzer with a sensitivity better than few pV/Hz in voltage noise measurements and 1 fA/Hz current is presented. It has two distinct independent input amplifiers parallel, connected to the same device under test (DUT) based on suppression of their uncorrelated noises. The instrument modular different front-end conceived optimize measurement low impedance or high DUTs. can cover 8 decades frequency span, from 10 mHz MHz. improvement respect traditional system simplicity connection...
To satisfy the increasing interest in integration of electronics onto optical and ionizing particle fully depleted detectors, a nonconventional JFET (junction field-effect transistor), designed to operate on completely depleted, 2-k Omega -cm resistivity silicon substrate, has been designed, fabricated, tested at room temperature. The devices show very low gate leakage current, output conductance, transconductance per unit width 3 mS/mm, pinch-off voltage -1.5 V. detectors makes possible...
Nanoscale capacitance imaging with attofarad resolution (∼1 aF) of a nano-structured oxide thin film, using ac current sensing atomic force microscopy, is reported. Capacitance images are shown to follow the topographic profile closely, nanometre vertical resolution. A comparison between experimental data and theoretical models shows that variations observed in measurements can be mainly associated probed by tip apex not positional changes stray contributions. versus distance further support...