New paper in Chinese Optics Letters about the implementation of triplicator gratings in SLMs

Our last paper is now published in Chinese Optics Letters entitled Experimental implementation of phase triplicator gratings in a spatial light modulator.

It reports on the different methods for implementing a triplicator, a phase grating that generates three equi-intense diffraction orders. The design with optimal efficiency features a continuous phase profile, which cannot be easily reproduced, and is typically affected by quantization. We compare its performance with binary and sinusoidal phase profiles. We also analyze the effect of quantizing the phase levels. Finally, a random approach is adopted to eliminate the additional harmonic orders.

In all cases, a liquid-crystal-on-silicon spatial light modulator is employed to experimentally verify and compare the different approaches.

This work is part of the PhD thesis of Shang Gao.

viernes, 23 de febrero de 2024 Sin comentarios

TecnOPTO participates at SPIE Photonics West

Ignacio Moreno attended SPIE Photonics West held in San Francisco from January 27th to February 1st, 2024.

There he presented our work entitled Analysis of polarization diffractive patterned polarizers and retarders, within the conference Complex Light and Optical Forces XVIII.

 

 

 

Categories: Conferences, International, Research Tags:
domingo, 4 de febrero de 2024 Sin comentarios

TecnOPTO participates at the kick-off meeting of the Spanish network on Structured Light

TecnOPTO participated at the kick-off meeting of FASLIGHT, the Spanish Network on Fundamentals and Applicationc of Structured Light, held in Salamanca in January 18th-19th, 2024.

TecnOPTO is one of groups participating in the newtwork. David Marco, Pascuala Garcia, María del Mar Sánchez-López and Ignacio Moreno attended the first meeting.

 

 

Categories: Collaborators, Projects, Research Tags:
jueves, 1 de febrero de 2024 Sin comentarios

Prof. Gladys Mínguez visits TecnOpto Lab

We had the visit of Prof. Gladys Mínguez, from the Group of Optics (GROC) of the University Jaume I de Castellón (UJI).

She was invited within the frame of the UMH Master of Biotechnology and Bioengineering, where she delivered an excellent presentation entitled «Synthesis of nanomaterials with pulsed lasers and their bioapplications».

 

sábado, 16 de diciembre de 2023 Sin comentarios

Interview to Pascuala García-Martínez at «Oscilador Armónico»

On May 17th 2023, Pascuala Garcia-Martinez was interviewed at «Oscilador Armónico”, the podcast broadcast about physics made at IFIC – Instituto de Física Corpuscular, a joint center of CSIC and teh University of Valencia.

The full interview is now available at the following link.

The program of that day was entitled «Óptica, Fotónica y la Física de la Luz»  and along the interview, Pascuala talked about the International Day of Light, some of the many applications that Optics and Photonics has nowadays, and about her work and research.

 

Categories: Outreach Tags:
sábado, 2 de diciembre de 2023 Sin comentarios

Prof. Miguel Alonso visits TecnOpto Lab

We had the honor to receive the visit of Prof. Miguel Alonso, Directeur Adjoint de la Recherche del Institute Fresnel, Marseille (France), Professor at the Institute of Optics, University of Rochester (USA) and Editor-in-Chief of the journal Optics Letters.

We invited Prof. Alonso to a combined visit to the Faculty of Physics of the University of Valencia (UV), where he dekivered the conference «The geometry hidden in Optics» and to the Institute of Bioengineering at UMH.

David Marco, who is now finishing a two-year postdoctoral stay at Marseille to work with Prof. Alonso, also joined in the visit. This reunion was held within the frame of a joint project (CIAICO/2021/276) of Generalitat Valenciana, also with the participation of Pascuala Garcia-Martínez and Eugenio Roldán from UV.

The picture shows us, from left to right Shang Gao, Esther Nabadda, David Marco, Miguel Alonso, María del Mar Sánchez-López and Ignacio Moreno.

 

Categories: Collaborators, International Tags:
viernes, 24 de noviembre de 2023 Sin comentarios

New paper in Optical Engineering analyzing the random multiplexing approach in modern LCOS SLMs

A new paper is now published in Optical Engineering entitled Multiplexing onto a spatial light modulator using random binary patterns. In this paper we analyze the random approach for encoding a variety of independent outputs from a multiplexed computer-generated diffractive element displayed on a SLM. Although the technique was demonstrated years ago, nowadays it can be applied with high-resolution SLMs with a very large number of pixels, thus allowing for a larger number of multiplexed functions without significant degradation. Nevertheless, we show that the technique is quite sensitive to the pixel crosstalk caused by the fringing field of modern LCOS SLMS, leading to a significant undesired DC order. Two alternative strategies to avoid this degradation.

The work has been done in collaborators Jeffrey A. Davis and Don M. Cottrell from San Diego State University (USA). It is the first paper published by PhD student Shang Gao.

miércoles, 8 de noviembre de 2023 Sin comentarios

New paper in OLT about a liquid-crystal axicon for the generation of polarization varying Bessel beams

Our new paper entitled Liquid crystal anisotropic axicon for the generation of non-diffracting Bessel beams with longitudinally varying polarization is now publised in the journal Optics and Laser Technology.

In this work we demonstrate a tunable liquid–crystal element of linear phase profile along the radial coordinate. In combination with a regular refractive axicon, it behaves as an anisotropic axicon, generating the collinear superposition of two orthogonally polarized Bessel beams with different propagation constant. This superposition results in a Bessel beam where the state of polarization (SOP) varies periodically along propagation.

The work has been done with our collaborators at the Military University of Technology, Warsaw (Poland), Noureddine Bennis, Anna Spadlo and Tomasz Jankowski, together with José Francisco Algorri, from University of Cantabria, in Santander (Spain).

lunes, 30 de octubre de 2023 Sin comentarios

TecnOPTO at COS-SPIE Photonics Asia 2023

We have attended SPIE-COS Photonics Asia 2023 conference, held in Beijing in October 14-16th, 2023, organized by the Chinese Optical Society and SPIE. We have participated at the conference on Holography, Diffractive Optics, and Applications XIII.

Ignacio Moreno delivered the invited talk entitled Diffraction gratings with full amplitude, phase, and polarization control: physical realization on liquid-crystal spatial light modulators. María del Mar Sánchez-López delivered the invited talk entitled Triplicator phase grating implementation in pixelated displays. PhD student Shang Gao also attended the conference.

A great opportunity to meet in person the Chinese optical community.

The SPIE proceedings of these two works are now available at:

Proceedings Volume 12768, Holography, Diffractive Optics, and Applications XIII; 127681B (2023) – Link

Proceedings Volume 12768, Holography, Diffractive Optics, and Applications XIII; 127681G (2023) – Link

Categories: Conferences, International, Research Tags:
domingo, 22 de octubre de 2023 Sin comentarios

TecnOPTO at EOSAM2023 in Dijon

We have participated in the Annual Meeting of the European Optical Society, EOSAM2023, held in Dijon (France) in September 11-15th, 2023.

David Marco delivered the talk entitled «Mapping partially polarized light to incoherent superpositions of vector beams and vortex beams with orbital angular momentum», where he presented our recent article published in Journal of Optics.

Esther Nabadda gave the talk «Complete Mueller matrix imaging polarimeter for evaluating optical components for structured light», where she presented our new imaging polarimeter system.

Finally, Ignacio Moreno participated in the event as the new EOS Secretary of the Board of Directors, and as co-chair of the Focus Session on Structured Light.

Great time in a great conference!

sábado, 16 de septiembre de 2023 Sin comentarios