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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 Scientific Reports, with a polarization grating design for the section of vector beams


SciRep

We published a new paper in Scientific Reports entitled Vector Beam Polarization State Spectrum Analyzer. This work has been done with our friends at San Diego State University.

In this work we present a proof of concept for a vector beam polarization state spectrum analyzer based on the combination of a polarization diffraction grating (PDG) and an encoded harmonic q-plate grating (QPG). The result is a two-dimensional polarization diffraction grating that generates six different q-plate channels with topological charges from −3 to +3 in the horizontal direction, and each is split in the vertical direction into the six polarization channels at the cardinal points of the corresponding higher-order Poincaré sphere. Consequently, 36 different channels are generated in parallel.

We show that this system can be used as a vector beam polarization state spectrum analyzer, where both the topological charge and the state of polarization of an input vector beam can be simultaneously determined in a single experiment.

Download the paper here

 


Categories: Collaborators, Publications, Research Tags:

Viernes, 26 de mayo 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

New paper in Journal of Optics about Solc filters in a reflective geometry


JOpticsWe published a new paper in Journal of Optics entitled Solc filters in a reflective geometry. It presents the realization of  birefringent Solc type filter in a reflective geometry.

This geometry reduces by half the number of required retarders, ensures the same spectral retardance function in pairs of retarders. The key element is a quarter-wave Fresnel rhomb located in between the set of retarders and a mirror. We present two cases, one with multiple-order quartz retarders, and a second one that uses two liquid-crystal retarders, this last one being therefore tunable.

This is the second paper in the PhD Thesis of Abdelgahfour Messaaddi, and it has been done in collboration with our friend Asticio Vargas form Universidad de La Frontera , Temuco (Chile) and our friend Noureddine Bennis and his coworkers at the Military University of Technology, Warsaw (Poland).


Jueves, 16 de marzo de 2017 Sin comentarios

María del Mar Sánchez new President of RSEF – Local Section in Alicante


LOGO-RSEF-fullMaría del Mar Sánchez became the President of the Local Section in Alicante of RSEF – Real Sociedad Española de Física,

RSEF is the Royal Spanish Society of Physics. With more than 4000 members, it is organized in different thematic divisions and specialized groups, as well as in local sections. The Local Section of Alicante started few years ago, and María del Mar has been active as a member of the Board. Now a new board has been elected and she has become President of the local section. The main objectives of the new board is promoting Physics in our local area, through outreach activities and seminars, and to foster the collaboration with High Schools, including activities to attract girls to STEM.

 

 


Categories: Collaborators, Education, Outreach Tags:

Lunes, 27 de febrero de 2017 Sin comentarios

New paper describing the Women in Light Sciences and Light Technologies Exhibition in RdF


rdfA new paper entitled Investigadoras en la luz y en las tecnologías de la luz (Women in Light Sciences and Light Technologies) has been published in the Revista Española de Física (Spanish Journal of Physics).

This paper describes the exhibition with the same name that was developed to commemorate the International Year of Light, describing the life and work of 12 women that made relevant contributions to the science of light.

This paper was written by Maria del Mar and Pascuala, in collaboration with Ana J. López-Díaz, from Universidade da Coruña, and Augusto Beléndez, from Universidad de Alicante.


Sábado, 17 de diciembre de 2016 Sin comentarios

New paper in Applied Optics about a new optical encryption technique


ao2017A new paper has been published in Applied Optics entitled New key based on tilted lenses for optical encryption, that describes a novel concept based on tilted spherical lenses for optical encryption using Lohmann’s type I systems. An experiment is presented, considering a hybrid encryption/decryption process where the image is numerically encrypted but optically decrypted.

This work was developed by our friends at the University of Valencia and we contributed by developing a experimental system that demonstrates the procedure.

 


Jueves, 15 de diciembre de 2016 Sin comentarios

New paper in JJAP demonstrating the parallel generation of different vector beams


jjapWe published a new paper in Japanese Journal of Applied Physics entitled Parallel generation of multiple first-order vector beams with a polarization grating and a q-plate device.

In this work we demonstrated the parallel generation of multiple vector beams by combining a polarization diffraction grating with a q-plate element.

This work was made with our friends at San Diego State University (US), and in collaboration with our colleagues at the Development Division of Citizen Holdings Co (Japan).


Miércoles, 9 de noviembre de 2016 Sin comentarios

Asticio Vargas visits TecnOPTO Lab


Asticio VargasIn June 2016 we received the visit of our friend Dr. Asticio Vargas, from the Department of Physical Sciences, at Universidad de La Frontera, in Temuco, Chile.

Asticio stayed for three weeks in our lab, where we have been working hard on different projects related to Solc filters and polarization.

The picture shows from right to left Asticio, with Ignacio, and two of the current PhD students, Abdelghafor Messaddi, from Algeria, and  Aaron Cofré, also from Chile.


Categories: Collaborators, International Tags:

Martes, 28 de junio de 2016 Sin comentarios

New paper in Optics Letters with q-plates encoded onto a SLM to produce integer and fractional vector beams


ThumbnailWe published a new paper in Optics Letters entitled Generation of integer and fractional vector beams with q-plates encoded onto a spatial light modulator. The paper appeared published in the sixth issue of OL in 2016.

In this paper we generated programmable vector beams with arbitrary -plates encoded using a spatial light modulator system. Consequently, we have been able to analyze new and exotic -plate designs without the difficulty of fabricating individual plates. For instance, we showed experimental results for positive and negative integer and new fractional vector beam values.

For instance, the picture shows a fractional vector beam where the polarization changes linearly in three sectors along the polar coordinate in the plane traversal to the beam.

This work has been done during the stay of María M. Sanchez-López and Ignacio Moreno at SDSU during Summer 2015.


Martes, 22 de marzo de 2016 Sin comentarios