Grupo de Tecnologías Ópticas y Optoelectrónicas

A new paper in Optics Express has been published entitled Random technique to encode complex valued holograms with on axis reconstruction onto phase-only displays, by José Luis Martínez-Fuentes and Ignacio Moreno.

This work presents a new technique to encode complex-valued holograms onto a phase-only display, based on a random selection determined by the amplitude level. The proposed technique offers some interesting features like on-axis hologram reconstruction, no iterative calculation, and good efficiency and good computational cost.

We provide here experimental results with computer generated holograms, as well as the generation of Hermite-Gauss and Laguerre-Gauss beams.

Pascuala García gave a conference about gender equity in a training workshop session organized by the Doctoral School of the Universitat Jaume I – UJI, in Castellón.

This session was organized by the Unidad de Igualdad of UJI in celebration of the International Day of Women and Girls in Science, on February 11th, 2018.

Related link (in Spanish).

We published a new paper in Applied Optics entitled Q-plates with a nonlinear azimuthal distribution of the principal axis: application to encoding binary data. This work has been developed with out colleagues at San Diego State University.

Here we use the optical system developed at SDSU to control two linear polarization components to encode q-plates where the angular orientation of the principal axis is varied spatially with a nonstandard distribution. We consider two cases: first, where the principal axis distribution is like an inverse-tangent function of the azimuth; and second, where it displays linear and flat segments. This last case is proposed as a new method for encoding binary data into the azimuthal lobes of the vector beam.

The use of the spatial light modulator based system allows these new and exotic q-plate designs without the difficulty of fabricating individual plates. Experimental results are presented.

Ignacio Moreno attended Photonics West, in San Francisco, in February 2018, 2nd-7th. An invited talk was presented by Jeffrey A. Davis on our mutual collaboration entitled Polarization state vector beam spectrum analyzer using q-plates encoded onto a spatial light modulator at the SPIE OPTO conference  Complex Light and Optical Forces XII, chaired by Enrique J. Galvez, David L. Andrews, and Jesper Glückstad. A related manuscript is available at the SPIE Proceedings Volume 10549, Complex Light and Optical Forces XII; 105490L (2018). Link

Ignacio Moreno, as the current President of the Spanish Society of Optics – SEDOPTICA, signed the renovation of the collaboration agreement with SPIE. The picture shows Dr. Maryellen Giger, 2018 SPIE President, signing the agreement with Ignacio.

Our friends Asticio Vargas and Fabián Torres, from Universidad de La Frontera (UFRO) in Temuco, Chile, visited TecnOPTO-UMH lab in January 2018.

For two weeks we have been able to work together and continue our fruitful collaboration and develop common research projects. The Spanish-Chilean connection continues.

Our 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.

We 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.

TecnOPTO has been granted with a PROMETEO project from Generalitat Valenciana. Link

The project, entitled Development of vectorial and polarimetric optical instrumentation, will be focused on the realization of advanced optical instruments for the generation, control and application of vector beams, and is leaded by María del Mar Sánchez-López.

The 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)

A 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.