A5087730846- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Spectroscopy and Laser Applications
- Optical and Acousto-Optic Technologies
- Photorefractive and Nonlinear Optics
- Optical Coatings and Gratings
- Acoustic Wave Resonator Technologies
- Quantum Mechanics and Non-Hermitian Physics
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Particle physics theoretical and experimental studies
- Nonlinear Photonic Systems
- High-Energy Particle Collisions Research
- Advanced MEMS and NEMS Technologies
- Semiconductor Quantum Structures and Devices
- Silicon Nanostructures and Photoluminescence
- Analytical Chemistry and Sensors
- Quantum Chromodynamics and Particle Interactions
- Gas Sensing Nanomaterials and Sensors
Polytechnic University of Bari
2015-2024
Polytechnic University of Turin
2013-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2020-2024
Institute of High Energy Physics
2024
A. Alikhanyan National Laboratory
2024
University of Bari Aldo Moro
1990-2023
Photonics (United States)
2021
Center for Biomolecular Nanotechnologies
2020
Instituto Politécnico Nacional
2003-2015
3S Photonics (France)
2007
A theoretical investigation of silicon-on-insulator nanometer slot waveguides for highly sensitive and compact chemical biochemical integrated optical sensing is proposed. Slot guiding structures enabling high confinement in a low-index very small region are demonstrated to be either cover medium refractive index change or deposited receptor layer thickness increase. Modal properties have been investigated, considering also the influence fabrication tolerances. Waveguide sensitivity has...
Nowadays, optical devices and circuits are becoming fundamental components in several application fields such as medicine, biotechnology, automotive, aerospace, food quality control, chemistry, to name a few. In this context, we propose complete review on integrated photonic sensors, with specific attention materials, technologies, architectures sensing principles. To aim, principles commonly used detection presented, focusing sensor performance features sensitivity, selectivity...
Silicon photonics has been a very buoyant research field in the last several years mainly because of its potential for telecom and datacom applications. However, prospects using silicon sensing mid-IR have also attracted interest lately. In this paper, we present our recent results on waveguide-based devices near- mid-infrared The silicon-on-insulator platform can be used wavelengths up to 4 μm; therefore, different solutions are needed longer wavelengths. We show passive Si such as...
This theoretical modeling and simulation paper presents designs projected performance of non-volatile broadband on-chip 1 × 2 electro-optical switches operating in the telecommunication C-band based on silicon-on-insulator technological platform. These optical consist an asymmetric two-waveguide directional coupler a symmetric three-waveguide coupler, which phase change material Ge <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sb Se...
We demonstrated that quartz-enhanced photoacoustic spectroscopy (QEPAS) is an efficient tool to measure the vibrational relaxation rate of gas species, employing quartz tuning forks (QTFs) as sound detectors. Based on dependence QTF resonance frequency resonator geometry, a wide range acoustic frequencies with narrow detection bandwidth was probed. By measuring QEPAS signal target analyte well properties different QTFs function pressure, time can be retrieved. This approach has been tested...
Guided-wave optical biosensors are reviewed in this paper. Advantages related to technologies presented and integrated architectures investigated detail. Main classes of bio receptors the most attractive transduction mechanisms discussed. The possibility use Mach-Zehnder Young interferometers, microdisk microring resonators, surface plasmon resonance, hollow antiresonant waveguides, Bragg gratings realize very sensitive selective, ultra-compact fast is Finally, CMOS-compatible proved be for...
A very compact (device area around 40 μm²) optical ammonia sensor based on amicroring resonator is presented in this work. Silicon-on-insulator technology used insensor design and a dye doped polymer adopted as sensing material. The exhibitsa good linearity minimum detectable refractive index shift of materialas low 8x10
Photonic crystals (PhCs) are artificial materials with a permittivity which is periodic function of the position, period comparable to wavelength light. The most interesting characteristic such presence photonic band gaps (PBGs). PhCs have very properties light confinement and localization together strong reduction device size, orders magnitude less than conventional devices, allowing potential high scale integration. These structures possess unique characteristics enabling operate as...
The development of a dual-gas quartz-enhanced photoacoustic (QEPAS) sensor capable simultaneous detection water vapor and alternatively methane or nitrous oxide is reported. A diode laser quantum cascade (QCL) excited independently simultaneously both the fundamental first overtone flexural mode quartz tuning fork (QTF), respectively. targeted absorption line located at 7181.16 cm–1 (1.392 μm), while QCL emission wavelength centered 7.71 μm was tuned to target two strong lines oxide, 1297.47...
Here we report on the broadband detection of nitrous oxide (N2O) and methane (CH4) mixtures in dry nitrogen by using a quartz-enhanced photoacoustic (QEPAS) sensor exploiting an array 32 distributed-feedback quantum cascade lasers, within spectral emission range 1190-1340 cm-1 as excitation source. Methane down to minimum limit 200 ppb at 10 s lock-in integration time was achieved. The demonstrated linear response 200-1000 ppm. Three different N2O CH4 atmospheric pressure have been analyzed....
We report on a statistical tool based partial least-squares regression (PLSR) able to retrieve single-component concentrations in multiple-gas mixture characterized by spectrally overlapping absorption features. Absorption spectra of mixtures CO–N2O and C2H2–CH4–N2O, both diluted N2, were detected the mid-IR range exploiting quartz-enhanced photoacoustic spectroscopy (QEPAS) using two quantum cascade lasers as light sources. Single-gas reference each target molecule acquired used PLSR-based...
This theoretical modeling and simulation paper presents designs projected performances of two non-volatile, broadband, on-chip 2 × electro-optical switches based upon the germanium-on-insulator (GeOI) photonic-electronic platform operating at 2.5 µm mid-infrared wavelength. These compact devices facilitate large-scale integration on a "monolithic wafer" where all components are made group-IV semiconductors. The two-waveguide directional coupler (DC) Mach-Zehnder interferometer (MZI). A...
The fabrication restrictions that must be imposed on the geometry of optical waveguides to make them behave as single-mode devices are well known for relatively large waveguides, with shallow etch depth. However, small (/spl sim/1 /spl mu/m or less in cross section) not understood. Furthermore, it is usually a requirement these polarization independent, which further complicates issues. This paper reports simulations conditions both behavior and independence, deeply etched...
In the very last years, optical access networks are growing rapidly, from both network operators and research interests points of view. Fiber To The Home (FTTH) is already a reality in plenty real contexts there has been further stimulus to proposal new solutions investigation possibilities, order optimize performance reduce capital operational expenditure. A complete systematic overview passive presented this paper, concerning hot topics main operative issues about design guidelines...
We present Vernier-effect photonic microcavities based on a germanium-on-silicon technology platform, operating around the mid-infrared wavelength of 3.8 μm. Cascaded racetrack resonators have been designed to operate in second regime Vernier effect, and typical comb-like spectra successfully demonstrated with insertion losses ∼5 dB, maximum extinction ratios ∼23 loaded quality factors higher than 5000. Furthermore, an add-drop resonator for device has characterized, exhibiting average 1 up...