The last issue of UMH-Sapiens includes the section «Donde nace la Ciencia» devoted to the research Intitutes of our university.
The Institute of Bioengineering (IB-UMH) is one of them, and María del Mar Sánchez appears as its vicedirector and representing TecnOpto laboratory.
María del Mar Sánchez participated as a jury member of the Ph.D. Thesis entitled «Tunable Diffractive Liquid-Crystal Photonic Devices» presented at Universidad Politécnica de Madrid by Mario García de Blas, supervised by our colleagues Morten Geday and Xabier Quintana from CEMDATIC-UPM center.
Very interesting work on LC technology.
TecnOpto is offering a predoctoral position to develop a PhD in the field of structured light and its applications, within frame of a research project from Generalitat Valenciana (ref. CIAICO/2021/276).
The research will be developed in conjunction with our colleagues at University of Valencia and at Autonomous University of Barcelona.
If you are motivated for this research in this field, contact us writing to the email: mar.sanchez@umh.es
More details in the next link
TecnOpto participated at the EOS Annual Meeting – EOSAM2022 held in Porto from September 12th to 16th.
Ee presented a communication about our interferometric system for measuring the phase content of structured light beams within the conference Advances and Applications in Optics & Photonics, chaired by Manuel Filipe Costa and María Teresa Flores-Arias.
During the meeting, the European Optical Society General Assembly was cellebrated on September 16th. There, Ignacio Moreno became new member of the EOS Board of Directors for the next two years.
María del Mar Sánchez-López presented our work on the generation of customized depolarization patterns using a LCOS-SLM system on the session «Polarization and Vectorial Shaping and Quantum Optics», as part of the conference «Laser Beam Shaping XXII» of the SPIE Optics & Photonics 2022 held in San Diego (USA) from August 20th to 25th.
This presentation is based on our recent work published in Scientific Reports: Link
Our last paper published in Optics and Laser Technology (OLT) is entitled Mueller matrix polarimetric analysis applied to characterize the physical parameters of a twisted-nematic liquid-crystal modulator.
This work presents a complete polarimetric study of a twisted-nematic (TN) LC cell. We review the existing physical models and analyze the different modulation regimes. We extend the usual Jones matrix approach, where these microscopic physical models were developed, to the corresponding Mueller matrix approach. This polarimetric analysis is then used to obtain the effective linear and circular retardance components of the cell and to characterize its physical parameters like the twist angle, the orientation of the LC director axis and the maximum retardance. The technique simplifies previous approaches with the advantage of employing a single wavelength.
This work is part of the PhD Thesis of Esther Nabadda.
Our last paper published in Optics and Lasers in Engineering (OLEN) is entitled Ferroelectric liquid-crystal modulator with large switching rotation angle for polarization-independent binary phase modulation.
Here we show a ferroelectric liquid crystal (FLC) modulator with a non-standard large switching rotation angle, close to 90◦. The modulator acts as a switchable wave-plate with an in-plane rotation of the principal axis under the action of a bipolar voltage. The modulator is shown to behave as a binary 𝜋 phase modulator independently of the input state of polarization.
This work is part of the PhD Thesis of Esther Nabadda, and its has been done in collaboration with Dr. hab Noureddine Bennis and his collaborators at the Faculty of New Technologies and Chemistry of the Military University of Technology, Warsaw (Poland).
TecnOPTO participated in the meeting XXXVIII Bienal de Física, organized by RSEF – The Royal Spanish Society of Physics, this year held in Murcia from 11th to 15th of July 2022.
We contributed with two communications at the Symposium of Advanced Optics, presented by Esther Nabadda and María del Mar Sanchez respectively, as well as another communication to the Symposium on Women in Physics, presented by Pascuala García.
In addition, Pas was member of the Scientidic Committee, organized a Round Table and chaired the Symposium on Women in Physics.
On July 1st 2022, Dra. Guadalupe López Morales participated at the seminars of CIO – Centro de Investigaciones en Optica (México) by delivering the conference entitled «Polarimetría de imagen para la caracterización de materiales».
Dra. López Morales stayed at TecnOPTO as a postdoctoral researcher for a period of 20 months. Currently she joined the Instituto de Investigación e Innovación en Energías Renovables de la Universidad de Ciencias y Artes de Chiapas (México).
The conference (in Spanish), which includes her work developed at TecnOPTO, can be viewed on YouTube:
A new paper has been published in Frontiers in Physics entitled Phase-shifting common-path polarization self-interferometry for evaluating the reconstruction of holograms displayed on a phase-only display.
Here we demonstrate a technique to perform phase-shift interferometry of structured light. The interesting aspect is that the same SLM system used to generate the structured light is used, without no need of any additional element, to perform the phase-shift interferometry. A simple rotation of a polarizer transforms the system from the standard phase-modulation regime to the common-path polarization interferometer.
This paper is part of the PhD Thesis of Esther Nabadda.