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In this paper the realization and the characterization of a new kind of resonant cavity enhanced photodetector (RCE), fully compatible with silicon microelectronic technologies and working at 1.55 μm, are reported.
Nanostructured materials, due to their peculiar physical and chemical properties, constitute the new class of functional supports for specific innovative applications. There is a strong competition between synthetic, man-made nanostructured materials and those coming directly from nature: the first ones can be precisely tailored by properly design and fabrication; the second ones are directly available...
The realization of a novel microfluidic device for inducing cell rotation is reported. It exploits the hydrodynamic forces acting on cells moving in a flow characterized by a parabolic velocity profile. The device operation was tested on yeast cells, since they have an asymmetrical shape due to a bud formation during the duplication phase. Image processing analysis of the experimental data allowed...
A novel parallel-channel microfluidic device exploiting cross-filtering to perform hydrodynamic focusing has been designed and successfully tested with Leukemia cells. The proposed approach allows to overcome the main limits till now presented by previous devices, and represents a step forward the realization of an on-chip integrated cytofluorimeter.
Diatomite is a natural fossil material of sedimentary origin, composed by fragments of diatom siliceous skeletons. Due to its chemical inertness, thermal stability, high surface area, non-toxicity and biocompatibility, diatomite is considered an ideal material for the preparation of diatomite silica drug delivery nanocarriers. In this work, the properties of diatomite nanoparticles (DNPs) as potential...
Flow focusing is a fundamental prior step in order to sort, analyze and detect particles or cells. In traditional flow-cytometry flow focusing is achieved by hydrodynamic focusing. An additional sheath fluid is used in order to confine the sample one. The main drawback of the method is the need of at least two inlets, one for the sheath and one for the sample fluid. This adds a big limitation: it...
Focusing is a necessary prior step for analysing particles or cells in a fluid flow. Hydrodynamic focusing is the gold-standard method used in traditional flow-cytometer in order to get cells aligned as they pass through the detection/interrogation region. In the recent years, microfluidic devices with different configurations for achieving hydrodynamic focusing have been proposed. However, the micro-channel...
In this work some optical properties of two different High Temperature Superconducting (HTSC) materials, in the normal state, are investigated: Nd123 (highest Tc YBCO-like superconductor) and Gd1212 (presenting Magnetic order and Superconductivity coexistance in the same cell below Tc). HTSC are very promising indeed for Photonics and Metamaterials fabrication mainly for their interesting properties...
In this paper an advance overview of our activity in the field of near-infrared silicon photodetectors, is presented. Proposed photodetectors are based on the internal photoemission effect through a Schottky junction and their fabrication results completely compatible with the silicon technology. Taking advantages by both new structures and new two-dimensional emerging materials a progressive increase...
In this work, we present a patented procedure that generates three dimensional (3D) image of a microscopic object with high definition, obtained by merging Scanning Electron Microscopy (SEM) and Digital Holography Microscopy (DHM) data. A high spatial resolution (up to rz=λ/20, ryx≅100nm) 3D model of the object is generated starting from two digital images, acquired separately, following standard...
In this work an advanced overview in the field of near-infrared silicon photodetectors, is presented. Proposed photodetectors are based on the internal photoemission effect through a Schottky junction and their fabrication results completely compatible with the silicon technology. Taking advantage of both new structures and new two-dimensional emerging materials, a progressive increase in device performance...
This work relates to the problem of sex predetermination in animals based on the separation of X- and Y-bearing sperm cells before insemination. We developed a device for efficient, non-destructive and label-free sorting of X-and Y-bearing sperm cells based on their Raman spectroscopic characteristics.
Nonlinear optics at nanoscale is a recent fascinating research field. Among the numerous nonlinear optics phenomena, due to its significant implications from both fundamental and applicative point of view, stimulated Raman scattering is one of the most interesting. In this paper, the observations of stimulated Raman scattering in silicon nano-particles, at the wavelengths of interest for telecommunications,...
Nonlinear optics at nanoscale is a recent fascinating research field. Among the numerous nonlinear optics phenomena, due to its significant implications from both fundamental and applicative point of view, stimulated Raman scattering is one of the most interesting. In this paper, the observations of stimulated Raman scattering in silicon nano-particles, at the wavelengths of interest for telecommunications,...
We propose a near infrared all-silicon integrated photodetector based on the internal photoemission effect. Device is charactered by a responsivity of 0.08 mA/W at 1550 nm for a reverse bias of 1 V.
In this paper, experimental investigations of stimulated Raman scattering in silicon quantum dots and nanocomposites based Si-materials are reported. Two Raman amplifiers are realized and amplifications due to stimulated Raman scattering are measured. For both of them, a significant enhancement of Raman gain and a significant reduction in threshold power are demonstrated. Our findings indicate that...
In this paper, a significant enhancement of the gain coefficient in Raman amplifier using nanostructured silicon clusters embedded in Si-rich nitride/Silicon superlattice structures (SRN/Si-SLs) is experimentally demonstrated. The measured gain enhancement is approximately a factor four larger than the value (0.076 cm/MW) reported for bulk silicon.
Organic-inorganic hybrid devices for biochemical monitoring are gaining increasing interest due to the physical and chemical properties of polymers. On the other hand, porous silicon (PSi) is really a versatile material due to its peculiar morphological, physical and chemical features. In this work, we have synthesized biocompatible multiblock copolymers based on Poly(epsiv-caprolactone) (PCL) and...
In this work we present the realization through a laser oxidation process of a Bragg grating over a porous silicon (PSi) waveguide. In the last years, the possibility of patterning the Porous Silicon (PSi) with photolithographic processes has been investigated in silicon micromachining. Unfortunately, the masking process of PSi by using standard photoresist presents remarkable difficulties since the...
In this paper the realization and the characterization of a new kind of resonant cavity enhanced photodetector (RCE), fully compatible with silicon microelectronic technologies and working at 1.55 mum, are reported.
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