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See the conference “How Photonics lights the world” by Glenn Boreman at UMH


The conference How Photonics lights the world delivered by Prof. Boreman at University Miguel Hernández on May 21st, 2018 is now available at the following link. This is part of the International Day of Light celebration.


Categories: Conferences, International, Outreach Tags:

Sábado, 26 de mayo de 2018 Sin comentarios

New paper in Optics & Laser Technology on the use of commercial q-plates at different wavelengths


S plateA new paper in the journal Optics & Laser Technology entitled Spectral performance of a zero-order liquid-crystal polymer commercial q-plate for the generation of vector beams at different wavelengths.

It deals with the use of liquid-crystal polymer q-plates operated at different wavelengths. We show how a broadband spectral characterization allows identifying the wavelengths with retardance values relevant for vector beam generation (ππ/2, and 3π/2). The wavelength is then used as a tuning parameter to change the device performance from the standard half-wave q-plate to a positive or a negative quarter-wave q-plate.

We present a simple procedure to derive the polarization distribution of the generated vector beams, and show that they can produce hybrid vector beams when operated at non-design wavelenths. Therefore, these results could extend the use of commercial q-plates for multicolour vector beam applications.

This work has been done in collaboration with Prof. Jeffrey A. Davis and Isaiah Abella, from San Diego State University.


 


Miércoles, 25 de abril de 2018 Sin comentarios

Ignacio Moreno invited speaker at the AOIM XI workshop


AOIMIgnacio Moreno participated as invited speaker in the Workshop on Adaptive Optics for Industry and Medicine AOIM XI, organized by Pablo Artal and his group at the University of Murcia, in March 2018, 4-7.

Our latest results on the adaptive generation and detection of vector beams by means of liquid crystal spatial light modulators were presented in the talk entitled “Polarization Diffractive Elements displayed in Liquid Crystal Spatial Light Modulators”.

The workshop had very interesting talks, and a great ambience.

 


Categories: Conferences, International, Research Tags:

Lunes, 12 de marzo de 2018 Sin comentarios

New paper in Applied Optics with a q-plates designs with non-linear angular distribution of the principal axis


APPL OPTWe 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.


 


Miércoles, 21 de febrero de 2018 Sin comentarios

Ignacio Moreno attends Photonics West and signs the agreement between SPIE and SEDOPTICA


SPIE - SEDOPTICAIgnacio 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.


 


Categories: Conferences, International, Research Tags:

Jueves, 8 de febrero de 2018 Sin comentarios

Asticio Vargas & Fabian Torres from UFRO visit TecnOPTO-UMH


Visita UFROsOur 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.


 


Jueves, 1 de febrero de 2018 Sin comentarios

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