A5086727941- Laser Material Processing Techniques
- Diamond and Carbon-based Materials Research
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Studies
- Photonic and Optical Devices
- Advanced Surface Polishing Techniques
- Glass properties and applications
- Ocular and Laser Science Research
- Laser-induced spectroscopy and plasma
- Force Microscopy Techniques and Applications
- Photonic Crystals and Applications
- Surface Roughness and Optical Measurements
- Solid State Laser Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Optical Coherence Tomography Applications
- Nanofabrication and Lithography Techniques
- Advanced Fiber Optic Sensors
- Liquid Crystal Research Advancements
- Neural Networks and Reservoir Computing
- Innovative Microfluidic and Catalytic Techniques Innovation
- Microfluidic and Bio-sensing Technologies
- Surface Modification and Superhydrophobicity
- Adhesion, Friction, and Surface Interactions
- Laser-Ablation Synthesis of Nanoparticles
- Advanced Memory and Neural Computing
Politecnico di Milano
2015-2025
Center for Biomolecular Nanotechnologies
2012-2025
University of Maryland, Baltimore
2025
Istituto di Fotonica e Nanotecnologie
2011-2023
National Research Council
2011-2023
College Track
2019
Université d'Angers
2019
Center for Nano Science and Technology
2015
Italian Institute of Technology
2015
University of Toronto
2004-2010
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel fiber laser system (IMRA America, FCPA muJewel) providing variable repetition between 0.1 and 5 MHz was used study the relationship resulting waveguide properties fused silica various borosilicate Increasing seen increase diameter decrease loss, with written 1-MHz yielding ~0.2-dB/cm propagation loss Schott...
A variable (0.2 to 5 MHz) repetition rate femtosecond laser was applied delineate the role of thermal diffusion and heat accumulation effects in forming low-loss optical waveguides borosilicate glass across a broad range exposure conditions. For first time, smooth transition from diffusion-only transport at 200 kHz strong 0.5 2 MHz observed shown drive significant variations waveguide morphology, with rapidly increasing diameter that accurately followed simple model over all variables...
Abstract The ability to process optical signals without passing into the electrical domain has always attracted attention of research community. Processing photons by unfolds new scenarios, in principle allowing for unseen signal processing and computing capabilities. Optical computation can be seen as a large scientific field which researchers operate, trying find solutions their specific needs different approaches; although challenges substantially different, they are typically addressed...
We report on waveguide writing in fused silica with a novel commercial femtosecond fiber laser system (IMRA America, FCPA microJewel). The influence of range parameters were investigated these initial experiments, including repetition rate, focal area, pulse energy, scan speed, and wavelength. Notably, it was not possible to produce low-loss waveguides when the fundamental wavelength 1045 nm. However, fabricate telecom-compatible at second harmonic 522 High quality propagation losses below 1...
We report on the integration of a size-based three-dimensional filter, with micrometre-sized pores, in commercial microfluidic chip. The filter is fabricated inside an already sealed channel using unique capabilities two-photon polymerization. This direct-write technique enables by post-processing chip that has been standard technologies. located at intersection two channels order to control amount flow passing through filter. Tests suspension 3 μm polystyrene spheres Rhodamine 6G solution...
We demonstrate the first buried optical waveguides in diamond using focused femtosecond laser pulses. The properties of nitrogen vacancy centers are preserved waveguides, making them promising for diamond-based magnetometers or quantum information systems.
For the first time to our knowledge, high-strength (>30 dB) first-order Bragg grating waveguides were fabricated in bulk fused silica glass a single-scanning step by modulating high-repetition-rate femtosecond fiber laser with an external acousto-optic modulator. The modulation induced waveguide segmentation delivering controlled bursts of pulses define array partially overlapped refractive index voxels. With appropriate choice frequency and sample scanning speed, low loss could be formed at...
The effects of femtosecond laser ablation on the physical and chemical properties at surface poly methylmethacrylate (PMMA) were studied. Femtosecond microfabrication caused initially wetting behavior PMMA to become nonwetting, mainly because laser-induced porosity submicroscale. Static dynamic contact angle measurements along with morphological characterization revealed that after irradiation, system lies in an intermediate regime between those theorized by Wenzel Cassie−Baxter....
The time dependence of the current transient i(t) produced by reversal domains in ferroelectric potassium nitrate thin-film memories 75–300 nm is analyzed as a function temperature and thickness using Avrami theory. For all films kinetics confirm low-dimensional nature system
In recent years, there has been significant research on integrated microfluidic devices. Microfluidics offer an advantageous platform for the parallel laminar flow of adjacent solvents potential use in modern chemistry and biology. To reach that aim, we worked towards realization a buried Lab-on-a-Chip which enables separation two components by exploiting non-mixing properties flow. fabricate aforementioned chip, employed femtosecond laser irradiation technique followed chemical etching....
Diamond's nitrogen vacancy (NV) center is an optically active defect with long spin coherence times, showing great potential for both efficient nanoscale magnetometry and quantum information processing schemes. Recently, the formation of buried 3D optical waveguides high quality single NVs in diamond were demonstrated using versatile femtosecond laser-writing technique. However, until now, combining these technologies has been outstanding challenge. In this work, we fabricate laser written...
Diamond has attracted great interest in the quantum optics community thanks to its nitrogen vacancy (NV) center, a naturally occurring impurity that is responsible for pink coloration of some diamond crystals. The NV spin state with brighter luminescence yield can be exploited readout, exhibiting millisecond coherence times at ambient temperature. In addition, energy levels ground triplet are sensitive external fields. These properties make NVs attractive as scalable platform efficient...
Ensemble negatively charged nitrogen-vacancy centers in diamond are promising quantum sensors. To optimize their sensitivity, it is crucial to increase the number of spins sampled and maximize coupling detection system without degrading spin properties. In this paper, we demonstrate enhanced magnetometry via a buried laser-written waveguide with 4.5 ppm centers. The waveguide-coupled exhibit coherence properties comparable those pristine diamond. Waveguide-enhanced magnetic field sensing...
We report on the first demonstration of an optical waveguide amplifier in phospho-tellurite glass providing net gain at 1.5 μm. The device was fabricated using a high repetition rate femtosecond laser and exhibited internal across 100-nm bandwidth covering entire C + L telecom bands.
A new domain of rapid waveguide writing with non-overlapping pulses a 1-kHz ultrashort laser is demonstrated to produce low loss waveguides in fused silica glass. This regime distinguishable two ways from traditional approaches writing. First, an examination wide 50-fs 5-ps range pulse duration shows the lowest form narrow 1.0 +/- 0.2 ps window that significantly exceeds 50 - 200 fs reported as optimal other studies. Second, unusually high scan speed mm/s points novel Type-II...
A femtosecond fiber laser was applied to fabricate broadband directional couplers inside bulk glass for general power splitting application in the 1250 1650-nm wavelength telecom spectrum. The response optimized over 400-nm bandwidth by tailoring coupling strength and waveguide interaction length balance differing dependence of straight bent transition regions. High spatial finesse femtosecond-laser writing technique enabled close placement (approxiamtely 6 microm) adjacent waveguides that...
We applied two-photon polymerization to fabricate 3D synthetic niches arranged in complex patterns study the effect of mechano-topological parameters on morphology, renewal and differentiation rat mesenchymal stromal cells. Niches were formed a photoresist with low auto-fluorescence, which enabled clear visualization fluorescence emission markers used for biological diagnostics within internal niche structure. The structurally stable culture up three weeks. At weeks expansion niches, cell...
Femtosecond laser writing is applied to form Bragg grating waveguides in the diamond bulk. Type II are integrated with a single pulse point-by-point periodic modification positioned towards edge of waveguide core. These photonic devices, operating telecommunications band, allow for simultaneous optical waveguiding and narrowband reflection from 4th order grating. This fabrication technology opens way advanced 3D networks range applications.