Francisco J. Martínez-Guardiola
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View article: Analysis of a vertically aligned liquid-crystal on silicon microdisplay for photonics applications
Analysis of a vertically aligned liquid-crystal on silicon microdisplay for photonics applications Open
We present the characterization results for an analogically addressed vertically aligned liquid crystal on silicon microdisplay (VA-LCoS). We show that it covers more than 360º phase modulation range at 1550 nm, and that in the visible the…
View article: Voltage dependence of retardance, flicker, and director angle orientation in reflective liquid crystal devices by average Stokes polarimetry
Voltage dependence of retardance, flicker, and director angle orientation in reflective liquid crystal devices by average Stokes polarimetry Open
Parallel-aligned liquid crystal on silicon devices (PA-LCoS) can be found nowadays in most of the advanced areas in optics and photonics. Many works have been dedicated to their characterization for optimum utilization in applications. How…
View article: Analytical modeling of blazed gratings on two-dimensional pixelated liquid crystal on silicon devices
Analytical modeling of blazed gratings on two-dimensional pixelated liquid crystal on silicon devices Open
Phase spatial light modulators and, in particular, parallel-aligned liquid crystal on silicon (PA-LCoS) microdisplays are widely used to display programmable diffractive optical elements (DOEs). These are pixelated elements with inherent d…
View article: Efficient and stable holographic gratings stored in an environmentally friendly photopolymer
Efficient and stable holographic gratings stored in an environmentally friendly photopolymer Open
Holographic gratings stored in low-toxicity photopolymer, Biophotopol, have been analyzed to achieve stable and efficient holograms. A curing process allows the hologram stabilization, but at the same time, it could produce a diffraction e…
View article: Predictive management of polarized light in liquid crystal devices based on average and flicker molecular tilt
Predictive management of polarized light in liquid crystal devices based on average and flicker molecular tilt Open
We incorporate the prediction of flicker to a semiphysical and analytical model describing the angular and wavelength dependencies of retardance in parallel aligned liquid crystal (PA-LC) devices. This makes the model unique due to the wid…
View article: Reflection holograms stored in an environment-friendly photopolymer
Reflection holograms stored in an environment-friendly photopolymer Open
In recent years, the development of low-toxicity photopolymers for holographic recording in reflection mode has reached great importance. One of the main advantages of reflection holograms is that they can be reconstructed using white ligh…
View article: LED-Cured Reflection Gratings Stored in an Acrylate-Based Photopolymer
LED-Cured Reflection Gratings Stored in an Acrylate-Based Photopolymer Open
The storage of volume holographic reflection gratings in low-toxicity photopolymers represents a challenge at present since they can be used in many important applications such as biosensors and holographic optical elements. In this contex…
View article: Combining average molecular tilt and flicker for management of depolarized light in parallel-aligned liquid crystal devices for broadband and wide-angle illumination
Combining average molecular tilt and flicker for management of depolarized light in parallel-aligned liquid crystal devices for broadband and wide-angle illumination Open
We demonstrate a complete semiphysical and analytical model describing the angular and wavelength dependencies not only of retardance, but also its flicker, in parallel aligned liquid crystal (PA-LC) devices. It relies on the fitting of th…
View article: Anamorphic and Local Characterization of a Holographic Data Storage System with a Liquid-Crystal on Silicon Microdisplay as Data Pager
Anamorphic and Local Characterization of a Holographic Data Storage System with a Liquid-Crystal on Silicon Microdisplay as Data Pager Open
In this paper, we present a method to characterize a complete optical Holographic Data Storage System (HDSS), where we identify the elements that limit the capacity to register and restore the information introduced by means of a Liquid Cr…
View article: Simplified physical modeling of parallel-aligned liquid crystal devices at highly non-linear tilt angle profiles
Simplified physical modeling of parallel-aligned liquid crystal devices at highly non-linear tilt angle profiles Open
In recent works, we demonstrated the accuracy and physical relevance of a highly simplified reverse-engineering analytical model for a parallel-aligned liquid crystal on silicon devices (PA-LCoS). Both experimental measurements and computa…
View article: Computational split-field finite-difference time-domain evaluation of simplified tilt-angle models for parallel-aligned liquid-crystal devices
Computational split-field finite-difference time-domain evaluation of simplified tilt-angle models for parallel-aligned liquid-crystal devices Open
Simplified analytical models with predictive capability enable simpler and faster optimization of the performance in applications of complex photonic devices. We recently demonstrated the most simplified analytical model still showing pred…
View article: Optimization of Photopolymer Materials for the Fabrication of a Holographic Waveguide
Optimization of Photopolymer Materials for the Fabrication of a Holographic Waveguide Open
In this work, we present a method of manufacturing an optical see-through display based on a holographic waveguide with transmission holograms that couple the incident light between air and the glass substrate, accomplishing total internal…
View article: Polarimetric and diffractive evaluation of 3.74 micron pixel-size LCoS in the telecommunications C-band
Polarimetric and diffractive evaluation of 3.74 micron pixel-size LCoS in the telecommunications C-band Open
Liquid-crystal on Silicon (LCoS) microdisplays are one of the competing technologies to implement wavelength selective switches (WSS) for optical telecommunications. Last generation LCoS, with more than 4 megapixels, have decreased pixel s…
View article: Modeling Diffractive Lenses Recording in Environmentally Friendly Photopolymer
Modeling Diffractive Lenses Recording in Environmentally Friendly Photopolymer Open
The improvements made in diffusion models simulating phase image recording in photopolymers enable the optimization of a wide range of complex diffractive optical elements (DOEs), while the miniaturization of spatial light modulators makes…
View article: Generation of diffractive optical elements onto photopolymer using liquid crystal on silicon displays
Generation of diffractive optical elements onto photopolymer using liquid crystal on silicon displays Open
In recent years, the optical storage and optical information processing technologies based on holographic and photonic techniques are suffering a huge improvement. On the other hand, Spatial Light Modulators (SLMs) based on LCoS microdispl…
View article: Multiplexed holograms recorded in a low toxicity Biophotopol photopolymer
Multiplexed holograms recorded in a low toxicity Biophotopol photopolymer Open
Multiplexed diffraction gratings were recorded in 300 μm thick layers of Biophotopol photopolymer by using peristrophic multiplexing schema. Thirteen sinusoidal phase gratings were stored in a low toxicity recording medium. The diffraction…
View article: PVA/AA photopolymers and PA-LCoS devices combined for holographic data storage
PVA/AA photopolymers and PA-LCoS devices combined for holographic data storage Open
We introduce a polyvinil alcohol/acrylamide (PVA/AA) photopolymer compound in a holographic memory testing platform to provide experimental results for storage and retrieval of information. We also investigate different codification scheme…
View article: Effective modeling of PA-LCoS devices and application in data storage in photopolymers
Effective modeling of PA-LCoS devices and application in data storage in photopolymers Open
Parallel aligned liquid crystal on silicon (PA-LCoS) devices are widely used in many optics and photonics applications to control the amplitude, phase and/or state of polarization (SOP) of light beams. We present a novel model enabling to …
View article: Efficient split field FDTD analysis of third-order nonlinear materials in two-dimensionally periodic media
Efficient split field FDTD analysis of third-order nonlinear materials in two-dimensionally periodic media Open
In this work the split-field finite-difference time-domain method (SF-FDTD) has been extended for the analysis of two-dimensionally periodic structures with third-order nonlinear media. The accuracy of the method is verified by comparisons…
View article: Analysis of holographic data storage using a PA-LCoS device
Analysis of holographic data storage using a PA-LCoS device Open
Holographic data storage systems (HDSS) have been a promising and very appealing technology since the first laser developments in the sixties. Impact of ongoing advances in the various components needs to be explored in its specific applic…