A5016905438- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Advanced Optical Imaging Technologies
- Liquid Crystal Research Advancements
- Optical Polarization and Ellipsometry
- Optical Coatings and Gratings
- Semiconductor Lasers and Optical Devices
- Higher Education Teaching and Evaluation
- Photonic Crystals and Applications
- Particle physics theoretical and experimental studies
- Educational Technology in Learning
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- E-Learning and Knowledge Management
- Phase-change materials and chalcogenides
- Electromagnetic Simulation and Numerical Methods
- Advanced Fiber Optic Sensors
- Orbital Angular Momentum in Optics
- Surface Roughness and Optical Measurements
- Educational theories and practices
- Laser Material Processing Techniques
- Vacuum and Plasma Arcs
- Advanced Fiber Laser Technologies
- Knowledge Societies in the 21st Century
- Metal and Thin Film Mechanics
University of Alicante
2015-2024
Auburn University
2024
University of Tennessee at Knoxville
2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2004-2023
Universidad Politécnica de Madrid
2019-2023
University of Buenos Aires
2003-2023
Fundación Ciencias Exactas y Naturales
1997-2023
University of Oklahoma
2016
Centro Científico Tecnológico - San Juan
2014
Universidad de Cantabria
1977-2013
In this paper we provide evidence of the temporal fluctuations phase modulation property a liquid crystal on silicon (LCoS) display, and analyze its effect when device is used for displaying diffractive optical element.We use commercial twisted nematic LCoS display configured to produce phase-only modulation, time resolved measurements diffraction efficiency that show rapid in millisecond order.We how these have be considered two typical methods characterization modulation: beam interference...
Contents1. Materials for dynamic holographic 3D display 2. Photopolymerizable nanocomposite materials applications 3. Photopolymers the recording of waveguides 4. Shrinkage in materials: photopolymers 5. Advances photorefractive and devices 6. Industrial-scale material mass production vHOEs 7. Non-imaging optics solar energy conversion 8. Data security data storage 9. Multimodal acquisition using digital holography 10.EUV SXR tomography with compact short wavelength sources 11.Holographic...
Structured light has proven useful for numerous photonic applications. However, the current use of structured in optical fiber science and technology is severely limited by mode mixing or lack elements that can be integrated onto end-faces wavefront engineering, hence generation still handled outside via bulky optics free space. We report a metafiber platform capable creating arbitrarily on hybrid-order Poincaré sphere. Polymeric metasurfaces, with unleashed height degree freedom greatly...
The Liquid-Crystal on Silicon (LCoS) spatial light modulator (SLM) has been used in wavelength selective switch (WSS) systems since the 1990s. However, most of LCoS devices for WSS have a pixel size larger than 6 µm. Although there are some negative physical effects related to smaller sizes, benefits more available ports, bandwidth, improved resolution, and compactness whole system make latest generation microdisplays highly appealing as core component systems. In this review work, three...
A method to perform a predictive search for given amplitude and phase modulation response in twisted nematic liquid crystal displays is presented. The algorithm based on simple physical model that we recently proposed considers the effect of liquid-crystal layers located vicinity edges, which are not able tilt. This was demonstrated explain accurately experimental transmittance curves. Here applied an optimized by changing input output polarization configurations. generalized configuration...
This paper deals with the non-linear oscillation of a simple pendulum and presents an approach for solving differential equation that governs its movement by using harmonic balance method.With this technique it is possible to easily obtain analytical approximate formulas period pendulum.As we shall see, these show excellent agreement exact calculated use elliptical integrals, they are valid both small large amplitudes oscillation.The most significant feature treatment presented simplicity...
In this paper we characterize the polarimetric properties of a liquid crystal on silicon display (LCoS), including depolarization and diattenuation which are usually not considered when applying LCoS in diffractive or adaptive optics.On one hand, have found that generates certain degree (that can be larger than 10%) depolarized light, depends addressed gray level incident state polarization (SOP), ignored above mentioned applications.The main origin light is related with temporal...
The possibilities that offer the holographic optical elements for photovoltaic and "see through display" applications open new windows recording materials. In this sense, some specific characteristics are required each particular application. Waveguides one of key these applications. Photopolymers most competitive candidates waveguide fabrication. work, we evaluate performance example from three families photopolymer material in fabrication a 633nm waveguide. Firstly, polyvinyl alcohol...
The homotopy perturbation method is used to solve the nonlinear differential equation that governs oscillations of a simple pendulum, and an approximate expression for its period obtained.Only one iteration leads high accuracy solutions relative error less than 2% amplitudes as 130°.Another important point this provides analytical angular displacement function time sum infinite number harmonics, although practical purposes it sufficient consider only finite harmonics.We believe present study...
Recently we proposed a novel polarimetric method, based on Stokes polarimetry, enabling the characterization of linear retardance and its flicker amplitude in electro-optic devices behaving as variable retarders.In this work apply extensively technique to parallelaligned liquid crystal silicon (PA-LCoS) under most typical working conditions.As previous step provide some experimental analysis delimitate robustness dealing with repeatability reproducibility.Then analyze dependencies for...
We present a model to more accurately describe the optical properties of twisted nematic liquid crystal display (LCD). In particular, we study molecules near either edge LCD that are unable twist and tilt under application an external elec- tric field. The these layers can be deduced from inten- sity transmittances measured using different configurations exter- nal linear polarizers. agreement between theoretical experimental is excellent, thus enabling prediction actual modulation for any...
We present an analysis of the diffraction efficiency diffractive lenses displayed on spatial light modulators that depends modulation response display. An ideal display would produce continuous phase-only modulation, reaching a maximum phase-modulation depth 2pi. introduce concept accounts for effect nonlinearities only in phase review model with which to evaluate this efficiency, including defects such as nonlinear coupled amplitude quantization, and limited depth. apply Fresnel show these...
In this paper we experimentally analyze the performance of a twisted nematic liquid crystal on silicon (LCoS) display as function angle incidence incoming beam. These are reflective displays that can be configured to produce amplitude or phase modulation by properly aligning external polarization elements. But demonstrate incident plays an important role in selection configuration. We performed Mueller matrix polarimetric analysis demonstrates recently reported depolarization effect observed...
Molecular diffusion effects have been widely studied inside photopolymers for holographic applications. Recently some works focused on low spatial frequencies to evaluate in real time the monomer effects. Assuming a Fermi-Dirac function-based profile, we fitted diffracted intensities, reflected and transmitted (up 8th order), obtain phase surface profile of recorded gratings. We influence polyvinyl-alcohol/acrylamide range between 2 lines/mm 6 lines/mm. demonstrated frequency magnitude sign...
Photopolymers have proved to be useful for different holographic applications such as data storage or optical elements. However, most photopolymers certain undesirable features, the toxicity of some their components low environmental compatibility. For this reason, Holography and Optical Processing Group at University Alicante developed a new dry photopolymer with high thickness called biophotopol, which is very adequate applications. In paper we describe our recent studies on biophotopol...
A polarimetric method for the measurement of linear retardance in presence phase fluctuations is presented. This can be applied to electro-optic devices behaving as variable retarders. The based on an extended Mueller matrix model retarder containing time-averaged effects instabilities. As a result, averaged Stokes polarimetry technique proposed characterize both and its flicker magnitude. Predictive capability approach experimentally demonstrated, validating calibration technique. liquid...