We offer a new Pre-Doctoral Contract for the realization of a PhD Thesis within the project CIGRIS/2023/043 of Generalitat Valenciana.
Required conditions: The candidate must hold a Degree in Physics, Engineering, Optics or similar from a non-EU institution. The degree title must have been obtained after 1st January 2019. The degree must qualify to enter a PhD program. Candidates must not hold a previous PhD.
If interested contact before August 20th Prof. MarÃa del Mar Sánchez López () and provide CV and Academic Certificate, motivation letter and a contact of a person who can provide a recommendation.
We are looking for motivated candidates to perform a PhD Thesis in the field of structured light, with willingness to collaborate at international level. Tasks to perform: Developing optical systems and methods to control the polarization of light for applications in microfabrication, polarization imaging and optical communications. The activities will comprise experimental tasks at TecnOpto Lab involving spatial light modulators and other optical equipment, as well as theoretical analysis and computer simulations. Recommended experience: Background in optics or optoelectronics; programming skills(Python, Matlab, Labview…); fluent English written and spoken (Spanish will be valued); teamwork and communications kills.
Contract Duration:4 years (renewable every year). Annual gross salary of 23,796.96 €, plus up to 1,600 euros to cover travel and location expenses. Social security and institutional benefits included. Starting Date: 1st November 2024 or 1stJanuary 2025.
In this work we apply an optical system with two cascaded LC-SLMs to produce multiple outputs with intensity and polarization control. We use a non-standard modulation configuration where the first LC-SLM operates as a phase-only modulator to encode a Fourier transform hologram multiplexing the desired multiple output beams, all with the same polarization. Next, the Fourier transform is optically formed onto the second LC-SLM, where each output beam is focused on different physical locations. The two SLMs have the LC director axis oriented horizontally. Thus, by rotating the linearly polarized output beams emerging from the first LC-SLM by 45 deg, we operate the second LC-SLM as a variable retarder. Then, by applying different phase-shifts at the different areas of the second LC-SLM, we can vary the polarization state of each output beam.
The work has been done in collaboration with our colleagues Prof. Jeffrey A. Davis and Prof. Don M. Cottrell from San Diego State University.
She delivered the talk entitled «Compound liquid-crystal anisotropic axicon with tunable polarization modulation of the generated Bessel beam«, where she presented our recent work published in Optics and Laser Technology (link).
The work was done in collaboration with Dr. Noureddine Bennis and his colleagues at the Military University of Technology, in Warsaw.
The Thesis, entitled «Liquid-crystal modulators in optical phase-shifting interferometry and polarimetric imaging«, was supervised by Ignacio Moreno and MarÃa del Mar Sánchez-López, and it was presented as a compendium of 5 articles:
The work presents a complete Mueller matrix imaging polarimeter that uses three liquid-crystal retarders and a polarization camera. The polarimeter is characterized and optimized with a standard correction procedure here adapted to be performed fully in-situ, without any additional element, based on considering the polarization camera as the reference. The accuracy limit caused by the extinction ratio in the camera micro-polarizers is analyzed. Finally, the imaging polarimeter is tested experimentally by analyzing well-known samples for structured light applications such as patterned retarders, a patterned polarizer, and a liquid-crystal depolarizer. The work is presented in a tutorial style useful to reproduce the procedure by non-experts in polarimetry.
This paper is part of the PhD Thesis of Esther Nabadda, and it has been done in collaboration with our colleagues Asticio Vargas, from the Universidad de La Frontera in Chile, and Angel Lizana and Juan Campos from Universitat Autònoma de Barcelona.
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.
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, MarÃa del Mar Sánchez-López and Ignacio Moreno attended the first meeting.
We had the visit of Prof. Gladys MÃnguez, 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».
We offer a new Pre-Doctoral Contract for the realization of a PhD Thesis within the project CIGRIS/2023/043 of Generalitat Valenciana.
