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Our former student Venancio Calero presents his PhD Thesis at FEMTO-ST Institute


VenancioOur former student Venacio Calero, presented his PhD Thesis entitled “Antenne à cristal photonique électro-optique pour la détection de fréquences électromagnétiques”, supervised by María Pilar Bernal and Nadège Courjal at the FEMTO-ST Institute, in Besançon (France), on December 19th, 2017.

Ignacio Moreno attended the defense and participated as a member of the jury.

 


Viernes, 5 de enero de 2018 Sin comentarios

New paper in Journal of Biophotonics about imaging biological tissues based on the indices of polarimetric purity


IPPsWe participated in a new paper published in Journal of Biophotonics entitled Polarimetric imaging of biological tissues based on the indices of polarimetric purity.

This work has been developed by our friends at Universitat Autònoma de Barcelona in the frame of the common coordinated collaboration project.

In this work we use the indices of polarimetric purity (IPPs) for the inspection of biological tissues.

Compared with standard polarimetric images of biological samples, IPP-based images lead to larger image contrast of some biological structures and to a further physical interpretation of the depolarizing mechanisms inherent to the samples.


Jueves, 4 de enero de 2018 Sin comentarios

Jocelyn Bell invested Doctor Honoris Causa at University of Valencia and Pascuala Garcia reads the Laudatio


HC JBellThe astrophysicist Jocelyn Bell, who discovered pulsars, has been invested Doctor Honoris Causa at University of Valencia in November 10th, 2017.

Pascuala Garcia, who promoted this recognition through the Faculty of Physics, read the Laudatio.

In 2015, Jocelyn Bell delivered a conference at the Faculty of Physics of University of Valencia, in the series of seminars coordinated by Pascuala Garcia. Together with this event, Jocelyn Bell visited the exhibition Women in Light Science’, where she is one of the twelve honoured women scientists.

Jocelyn Bell’s speech (in Valencian)

Pascuala Garcia’s Laudatio (in Valencian)

Speech of the Rector of University of Valencia (in Valencian)

More on this news (in Spanish)


Sábado, 11 de noviembre de 2017 Sin comentarios

New paper in Optical Engineering about parallel multiple imaging with a polarization diffraction grating


OptEngA new paper entitled Multichannel polarization imaging with a polarizing diffraction grating has been published in Optical Engineering. The work has been done in collaboration with our friends at the Department of Physics at San Diego State University (SDSU).

The work demonstrates a method to generate multiple imaging with polarization state diversity, based on the use of  a polarization diffraction grating design. The polarization grating is demonstrated in an SLM-based optical system developed at SDSU. We demonstrate the generation of six diffraction orders that encode six different polarization transformations. This technique can be useful for producing single-shot imaging polarimeters.

 

 


Viernes, 10 de noviembre de 2017 Sin comentarios

New paper in Optics Express about dual polarization split lenses


OptExpressWe published a new paper in Optics Express where we report the realization of polarization sensitive split lens configurations. We propose and demonstrate the generalization of the split lens concept to vectorial split lenses, leading to light patterns with customized intensity and state of polarization. We demonstrate how these polarization split lenses can be experimentally implemented by means of an optical system using two liquid crystal spatial light modulators, each one phase modulating one orthogonal polarization component.

The proposed technique is a simple method to generate structured light beams with polarization diversity, with potential applications in polarimetry, customized illuminators or quantum optics.

This work has been published in Optics Express, entitled Dual polarization split lenses. The work has been developed in collaboration with our friends at the Departamento de Ciencias Físicas, Universidad de la Frontera (Chile) and our friends at Departamento de Física de la Universitat Autònoma de Barcelona. This is the third paper resulting from the Thesis of the PhD student Aarón Cofré.


Martes, 19 de septiembre de 2017 Sin comentarios

Pascuala García presents an SLM based optical microscope at the SPIE Optical Metrology Conference in Munich


SPIE PasPascuala Garcia presented the communication entitled “On axis programmable microscope using liquid crystal spatial light modulator” at the SPIE Optical Metrology Conference, held in Munich in June 25th to 29th, 2007.

In her presentation, she showed an optical microscope system we have developed, that includes an LCOS SLM display to perform opto-digital filtering on-axis. We use a Hamamatsu SLM, free of flickering, which can be tuned to fully eliminate the zero order component of the encoded diffractive filter, therefore making use of the full space-bandwidth. The system was demonstrated by implementing different optical processing operations based on phase-only gratings such as phase-contrast, band-pass filtering, additive and subtractive imaging, or Differential Interference Contrast (DIC) imaging.

A related manuscript is available at the SPIE Proceedings in Optical Methods for Inspection, Characterization, and Imaging of Biomaterials III, edited by Pietro Ferraro, Simonetta Grilli, Monika Ritsch-Marte, Christoph K. Hitzenberger, Proc. of SPIE Vol. 10333, 103330Q (2017). Link

 


Viernes, 21 de julio de 2017 Sin comentarios

New paper in OLT with a new polarization grating based single shot polarimeter


OLTWe developed a quantitative analysis of the performance of a complete snapshot polarimeter based on a polarization diffraction grating (PDGr). The work has been published in the paper entitled Quantitative performance of a polarization diffraction grating polarimeter encoded onto two liquid-crystal-on-silicon displays, published at the journal Optics & Laser technology.

The PDGr is generated in a common path polarization interferometer with a Z optical architecture that uses two liquid-crystal on silicon (LCoS) displays. The programmable PDGr is capable to act as a simultaneous polarization state generator (PSG), yielding diffraction orders with different states of polarization. The same system is also shown to operate as a polarization state analyzer (PSA), therefore useful for the realization of a snapshot polarimeter. We analyze its performance using quantitative metrics such as the conditional number.

This work has been developed in collaboration with our friends at the Departamento de Ciencias Físicas, Universidad de la Frontera (Chile) and our friends at Departamento de Física de la Universitat Autònoma de Barcelona. And it will part of the PhD Thesis of Aarón Cofré.


Miércoles, 14 de junio de 2017 Sin comentarios

New paper in Journal of Biomedical Optics about a polarization gating method


JBOA new paper has been published in Journal of Biomedical Optics entitled Polarization gating based on Mueller matrices.

This work has been developed at the Department of Physics of the Autonomous University of Barcelona, with the participation of Ignacio Moreno.

It demonstrates a polarization gating method based on the experimentally measured Mueller matrices. Polarization gating refers to a collection of imaging methods based on the combination of different controlled polarization channels. Here, first the Mueller matrix is characterized, and then employed to evaluate different polarization channels. The methodology is applied on different biological samples.

 


Martes, 16 de mayo de 2017 Sin comentarios

Prof. Kristiaan Neyts visits TecnOpto-UMH


We were very pleased that Prof. Kristiaan Neyts, Head of the Liquid Crystals and Photonics Group from the Ghent University, accepted our invitation to come to Elche and impart a seminar on liquid crystals in the frame of the 3rd TECNIT PhD Workshop of our university, held in March 29th.

You can access to his seminar  LIQUID CRYSTALS: ROTATING MOLECULES FOR TUNABLE OPTICS here:


Martes, 11 de abril de 2017 Sin comentarios

Ignacio Moreno president of SEDOPTICA – the Spanish Society of Optics


SedopticaIgnacio Moreno became the President of SEDOPTICA – the Spanish Society of Optics. After three years as Vicepresident, he now becomes the President of the society for the period of the next three years.

SEDOPTICA joins researchers, academia and professionals of the area of Optics & Photonics in Spain.

During this period SEDOPTICA will reach its 50th anniversary in 2018.


Categories: International, Outreach Tags:

Martes, 4 de abril de 2017 Sin comentarios