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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 European Journal of Physics about vortex beams with a TNLC-SLM


ejpWe published a new paper in European Journal of Physics entitled Vortex beam generation and other advanced optics experiments reproduced with a twisted-nematic liquid-crystal display with limited phase modulation.

In this work we propose the use of twisted-nematic liquid-crystal spatial light modulators (TN-LC-SLM) as a useful tool for training students in the manipulation of light beams with phase-only masks. In particular, we focus the work on the realization of phase-only gratings and phase-only spiral phases for the generation of vortex beams, beams carrying orbital angular momentum (OAM). We include different examples, including a optimal triplicator phase grating, and its combination with spiral phase patterns and lens functions to generate a variety of vortex beams.

The paper is included in a special section of the journal devoted to “Advanced Optics”, and it is the first publication from the PhD Thesis of Aarón Cofré.


Categories: Education, International, Publications Tags:

Miércoles, 14 de diciembre de 2016 Sin comentarios

New paper in JEOS-Rapid Pub with an optical system to characterize retarders in a wide spectral range


jeosWe published a new paper in Journal of the European Optical Society – Rapid Publications, entitled Optical system for measuring the spectral retardance function in a extended range.

Here we apply a well-known technique for determining the spectral retardance of different linear retarders by measuring the transmission spectra between crossed or parallel polarizers. The system we developed allows measurements in a wide spectral range covering the visible (VIS) and near infrared (NIR) spectrum in the range from 400 to 1600 nm.

This work was made in collaboration with our friend Asticio Vargas from UFRO (Chile), and it is the first paper of the PhD thesis of Abdelghafor Messaadi.


Categories: International, Publications, Students Tags:

Lunes, 14 de noviembre 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

New paper in Optics Letters about the production of non-diffracting vector beams


Vector beamsWe published a new paper in Optics Letters, entitled Nondiffracting vector beams where the charge and the polarization state vary with propagation distance. The paper appeared published in the OL issue of May 2016.

In this work we  generate nondiffracting vector beams where the charge and the polarization state vary with the propagation distance. We use reflective geometry where a parallel-aligned spatial light modulator is used to spatially modulate two orthogonal linear polarizations. We encode spiral phases with equal charge but with opposite signs onto the two polarization directions to encode a vector beam and add two axicon phases. Both the charge and the phase shift between the two axicons can be varied along the focus line.

This work has been done in collaboration with our friends at San Diego State University, and was designed during the recent visit of Ignacio Moreno to SDSU in February 2016.


Categories: International, Publications Tags:

Miércoles, 18 de mayo de 2016 Sin comentarios

New paper in Optical Engineering, with a q-plate operating at the 1550 nm telecom wavelength


1550 nm peakWe published a new paper in Optical Engineering Letters, entitled Generation of vector beams at 1550 nm telecommunications wavelength using a segmented q-plate. The paper appeared published in the third issue of OE journal in 2016.

In this work we present the use of a q-plate device operating at the 1550 nm telecommunications wavelength. A prototype liquid-crystal device from Citizen Holdings Co. is demonstrated to be useful for the generation of vector beams and orbital angular momentum transfer at this important wavelength.

The device was developed for a visible wavelength, but we show here that it can be applied also for the 1550 nm wavelength, where is of interest to apply such devices to multiplex data with OAM channels.

This work was initiated during the stay of María M. Sanchez-López and Ignacio Moreno at SDSU during Summer 2015.


Categories: International, Publications Tags:

Sábado, 9 de abril de 2016 Sin comentarios

Ignacio Moreno presents an invited conference at SPIE Photonics Europe 2016


epeIgnacio Moreno presents an invited communication at the meeting SPIE Photonics Europe held in Brussels in April 2016.

The communication is entitled “Production of arbitrary polarized light beams with a liquid crystal spatial modulator”, and it was presented within the session Optical Micro- and Nanometrology. This communication reviews our recent advances in the design of polarization diffractive optical elements encoded onto a spatial light modulador system.


Categories: Conferences, International, Publications Tags:

Sábado, 9 de abril de 2016 Sin comentarios

The paper “Nondiffracting Bessel beams with polarization state that varies with propagation distance” selected by OSA for SPOTLIGHTS ON OPTICS


SpolightThe paper Nondiffracting Bessel beams with polarization state that varies with propagation distance that we published in Optics Letters last year has been selected in the section SPOTLIGHT ON OPTICS by OSA – the Optical Society of America, specifically in the section devoted to Optical Design and Instrumentation.

This section of the OSA website selects highlighted articles from OSA journals. Our paper in Optics Letters has been receiving considerable impact, since it was for three consecutive months in the TOP10 downloaded papers in the journal.

 


Categories: International, Outreach, Publications Tags:

Jueves, 7 de abril 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