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Digital Holograms can be multiplexed by encoding the information of two or more holograms in a single one. Multiplexing of digital holograms has been used to measure some object properties, as the state of polarization, by a single image acquisition [1]. Other applications of multiplexing techniques in holography regard the investigation of ultra-fast events [2], or experiments in which a diffraction...
Digital Holography (DH) provide coherent imaging in microscopy for a variety of applications such as characterization of silicon MEMS, three dimensional imaging [1,2], particle image analysis [3,4]. The potential applications of DH have been extended to a wide spectral range, from far IR [5] to deep UV [6]. The computational image reconstruction from a digital hologram has many advantages compared...
Imaging moving targets through smoke and flames in fire scenarios is an unsolved and challenging issue. Indeed, thermographic cameras able to see through smoke are blinded by the flame emissions. Here two different methods are shown which give the opportunity to solve the problem relying on Infrared Radiation (IR) active imaging modalities. At first we discuss the lensless IR Digital Holography method,...
Seeing through smoke and flames is a great challenge for imaging capabilities and any advance has applications of wide impact in the industrial and the safety field. The existing thermographic detectors employ Infrared (IR) bolometers which are able to see clearly the targets through smoke, as the infrared radiation is just slightly scattered by the soot particles [1]. However, they are blinded whenever...
Here we show a completely new concept of a compact holographic microscope that can ensure the multi-functionality by accomplishing simultaneously quantitative phase-contrast analysis and an accurate 3D tracking of particles and cells in microfluidics.
We demonstrate that particles floating in the microfluidic environment can be driven by optical forces along preferential directions. Meanwhile the particles can be imaged by a digital holographic microscope with the aim to get their quantitative phase-contrast signature.
We present a new approach for fabricating single or array of polymer optical microresonators based on a electrohydrodymanic 3D lithographic process. Passive as well as active spherical microresonators which emebedd semiconductor Quantum dots are demonstrated.
A numerical method to easily obtain a quantitative phase map of objects flowing in micro-fluidic devices using a digital holographic microscope is shown. The presented technique is called digital self-referencing because the retrieved wavefront is folded in order to subtract the area outside the micro-fluidic channel from the area where the sample is.
We describe a numerical method applied to the reconstruction of a digital hologram, that allows to obtain the image of an object at three planes at different depths simultaneously. In order to do this, we introduce a numerical quadratic deformed diffraction grating into the algorithm.
A new method for direct patterning of Poly(dimethylsiloxane) (PDMS) structures is presented. This technique will be named Light Induced Patterning (LIP) as it's induced by laser light through a functionalized substrate of Lithium Niobate (LN) crystal. The process is a full field technique that, conversely to the point wise ones, allows PDMS patterning with a single laser light exposure. PDMS is a...
Through adaptive deformation of digital holograms it is possible to manage and control the depth of focus in 3D imaging. Objects lying at different distances can be set simultaneously infocus.
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