A5048680230- Optical Polarization and Ellipsometry
- Spectroscopy and Chemometric Analyses
- Spectroscopy Techniques in Biomedical and Chemical Research
- Leaf Properties and Growth Measurement
- Data Visualization and Analytics
- Communication and COVID-19 Impact
- Optical and Acousto-Optic Technologies
- Calibration and Measurement Techniques
- Optical measurement and interference techniques
- Optical Coherence Tomography Applications
- Photoacoustic and Ultrasonic Imaging
- Advanced Photonic Communication Systems
- Photoreceptor and optogenetics research
Universitat Autònoma de Barcelona
2023-2025
Universidade de Santiago de Compostela
2020-2022
Depolarizing behavior is commonly observed in most natural samples. For this reason, optical tools measuring the differences depolarization response among spatially separated structures are highly useful a wide range of imaging applications for enhanced visualization structures, target identification, etc. One used tool depolarizing discrimination so-called spaces. In article, we exploit combined use two spaces, indices polarization purity (IPP) and polarizance–reflection–transformation...
Polarimetry encompasses a collection of optical techniques broadly used in variety fields. Nowadays, such have provided their suitability the biomedical field through study polarimetric response biological samples (retardance, dichroism and depolarization) by measuring certain observables. One these features, depolarization, is mainly produced scattering on samples, which predominant effect turbid media as tissues. In turn, retardance dichroic effects are tissue anisotropies can lead to...
Polarimetrical imaging is a noninvasive optical technique of great interest in biophotonics since it has the capability obtaining relevant information biological samples, being useful, for instance, early detection diseases or classification structures, both on animal and vegetal tissues. Different structures produce different outcomes when interacting with light due to their polarimetric properties such as depolarization, dichroism retardance. An exhaustive analysis these characteristics...
Polarimetric techniques are widely used in a vast number of applications such as remote sensing, material characterization, astronomy and biological tissue inspection. In this last scenario, different polarimetric observables have proved their potential for enhancing imaging visualization. work we use set derived from the arrow decomposition Mueller matrix first time: enpolarizing, retarding depolarizing descriptors. particular, mean intensity coefficient three indices purity, absolute...
In this work we show how a specific set of three depolarizing observables, the Indices Polarimetric Purity (IPP), P1, P2 and P3, are ideal metrics to study depolarization characteristic media. We simulate different scenarios, based on origins, corresponding IPP values. The simulations incoherent addition multiple elemental polarizing elements, as polarizers and/or retarders with characteristics (orientation, retardance, transmittance, etc.). Further scenarios also studied by including effect...
Through the arrow decomposition of Mueller matrix, respective sets sixteen independent polarimetric images biological tissues are obtained for enpolarizing, retarding and depolariz-ing descriptors. In addition to mean intensity coefficient three indices purity, absolute values Poincaré orientations diattenuation, polarizance, entrance re-tardance exit retardance vectors considered. this work we use first time set observables visualization structures, both animal vege-tal origin....
Polarimetry comprises a set of optical techniques great interest in biophotonics due to its capability obtain relevant information from biological samples by means noninvasive and nondestructive methods. For instance, they are useful pathology detection or different structures classification, among others. By studying the polarimetric response we can how produce changes characteristics light. These depend on properties samples: depolarization, dichroism retardance. From experimental...
We propose an imaging method to enhance and reveal structures within samples by using a polarization-based filter. This filter removes the isotropic content while amplifying anisotropic component of depolarization. Whereas depolarization leads complete loss polarimetric information, one is connected with intrinsic characteristics samples. The has capability diminish samples, revealing their inherent information. As representative cases, we analyze effect in heart brain sections animal...
Polarimetric techniques have widely demonstrated their potential in biophotonics due to its capability obtain relevant information from biological samples a noninvasive and nondestructive way. Different polarimetric observables, obtained the Mueller matrix of sample, are used explore these pathology detection or different structures classification. The physical properties sample related polarization can be divided three main groups: retardance, dichroism depolarization. In this work, we...
We present the optimization and calibration of a Mueller matrix imaging polarimeter. The polarimeter is intended to be used as compact tool for biomedical diagnosis, in particular skin examination. device uses pixelated-polarization camera along with fixed variable retarder polarization state analyzer, minimizing number elements Full-Mueller measurements. For generator an LED light source, polarizer followed by pair LCVRs generate any over Poincare sphere. With this system properties sample...
Polarimetric data is nowadays used in the biomedical field to inspect organic tissues or for early detection of some pathologies. In this work, we present a thorough comparison between different classification models based on several sets polarimetric data, allowing us choose framework construct tissue models. Four well-known machine learning are compared by analyzing three datasets: (i) selection ten representative observables; (ii) Mueller matrix elements; and (iii) combination datasets....
The study of the interaction biological tissue with polarized light leads to relevant information physical properties (dichroism, retardance and depolarization) samples. Polarimetric analysis different characteristics in tissues is useful for applications such us classification, contrast enhancement or pathology detection. By means polarimetric imaging techniques we can characterize signature samples a noninvasive nondestructive way. We have found that depolarization special interest turbid...
Fringe visibility and noise removal, are key success factors in interferometric techniques, where novel deep learning techniques can be applied. We test the use U-Net convolutional network applied to obtained interference images, trained with an ad-hoc generated image dataset complex fringe patterns, computed using high order Zernike polynomials.
In this contribution we show how, in times of pandemic, outreach activities driven by social networks can be a successful alternative to face-to-face events. Designing each activity properly suit the host platform ensures success.