Dr. Francisco J. Martínez-Guardiola Profile

Dr. Francisco J. Martínez-Guardiola

at Univ de Alicante

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 4 October 2023 Presentation + Paper

Absolute polarimetric calibration of the retardance of a liquid crystal on silicon microdisplay

A. Sánchez-Montes, A. Márquez, J. Francés, F. Martínez-Guardiola, E. Calzado, S. Gallego, I. Pascual, A. Beléndez

Proceedings Volume 12673, 126730A (2023) https://doi.org/10.1117/12.2672547

KEYWORDS: Liquid crystals, Liquid crystal on silicon, Polarimetry, Modulation, Spatial light modulators, Refractive index, Binary data, Visible radiation, Phase unwrapping

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Proceedings Article | 1 August 2021 Presentation + Paper

Voltage dependence of retardance, flicker, and director angle orientation in reflective liquid crystal devices by average Stokes polarimetry

Andrés Márquez, Francisco Martínez-Guardiola, Marta Morales-Vidal, Daniel Puerto, Jorge Francés, Sergi Gallego, Inmaculada Pascual, Augusto Beléndez

Proceedings Volume 11841, 1184108 (2021) https://doi.org/10.1117/12.2595742

KEYWORDS: Polarimetry, Liquid crystal on silicon, Polarization, Wave plates, Reflectivity, Calibration, LCDs, Polarizers, Liquid crystals, Modulation

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SPIE Journal Paper | 17 February 2020

Analytical modeling of blazed gratings on two-dimensional pixelated liquid crystal on silicon devices

Andrés Márquez, Francisco Martínez-Guardiola, Jorge Francés, Cristian Neipp, Manuel Ramírez, Eva Calzado, Marta Morales-Vidal, Sergi Gallego, Augusto Beléndez, Inmaculada Pascual

OE, Vol. 59, Issue 04, 041208, (February 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.4.041208

KEYWORDS: Diffraction, Diffraction gratings, Liquid crystal on silicon, Mendelevium, Liquid crystals, Diffractive optical elements, Optical engineering, Quantization, Spatial light modulators, Phase shift keying

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Proceedings Article | 3 October 2019 Paper

Efficient and stable holographic gratings stored in an environmentally friendly photopolymer

Marta Morales-Vidal, Manuel G. Ramírez, Daniel Sirvent, Francisco J. Martínez-Guardiola, Mariela Álvarez, Inmaculada Pascual

Proceedings Volume 11207, 112072J (2019) https://doi.org/10.1117/12.2530574

KEYWORDS: Holography, Holograms, Diffraction gratings, Diffraction, Refractive index, Polymers, Photopolymers

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Proceedings Article | 6 September 2019 Presentation + Paper

Predictive management of polarized light in liquid crystal devices based on average and flicker molecular tilt

A. Márquez, F. J. Martínez-Guardiola, J. Francés, S. Gallego, I. Pascual, A. Beléndez

Proceedings Volume 11136, 1113609 (2019) https://doi.org/10.1117/12.2530285

KEYWORDS: Instrument modeling, Modulation, LCDs, Polarimetry, Polarization, Visible radiation, Liquid crystals, Molecules, Liquid crystal on silicon, Spatial light modulators

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Proceedings Article | 6 September 2019 Paper

Blazed grating theory to minimize the non-idealities in LCoS devices

A. Márquez, F. Martínez-Guardiola, J. Francés, M. Ramírez, E. Calzado, M. Morales-Vidal, S. Gallego, I. Pascual

Proceedings Volume 11136, 1113613 (2019) https://doi.org/10.1117/12.2530290

KEYWORDS: Diffraction gratings, Diffraction, Liquid crystal on silicon, Quantization, Spatial light modulators, Modulation, Polarimetry

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Proceedings Article | 14 May 2019 Presentation + Paper

Reflection holograms stored in an environment-friendly photopolymer

Manuel Ramírez, Daniel Sirvent, Manuel Ortuño, Víctor Navarro-Fuster, Francisco Martínez, Augusto Beléndez, Inmaculada Pascual Villalobos

Proceedings Volume 11030, 110300E (2019) https://doi.org/10.1117/12.2521439

KEYWORDS: Holography, Holograms, Spatial frequencies, Diffraction gratings, Diffraction, Polymers, Light emitting diodes

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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 light, which has enabled that many researches have focused on the development of sensors for different types of analytes. Optical data storage and three-dimensional multiplexing of reflection holograms to improve the data storage density have also been investigated through reflection holograms. However, the photopolymers used in these researches have certain undesirable features such as the toxicity of some of their components and non-environmentally compatibility. The common used hydrophilic photopolymers content poly(vinyl alcohol) (PVA) or gelatine binder and monomers related to acrylamide. This compound has a high potential to cause cancer. For this reason, we developed a photopolymer called “Biophotopol” as a recording holographic material for optical applications. “Biophotopol” have a low toxicity, good recycling properties and is environmental-friendly. The basic formulation of “Biophotopol” includes an initiator system which is a free radical generator composed by triethanolamine as co-initiator and plasticizer and sodium salt 5’- 72 riboflavin monophosphate as sensitizer dye, sodium acrylate as polymerizable monomer and PVA as inert binder polymer. Additionally, a cross-linking agent, as N,N’-(1,2-dihydroxyethylene)bisacrylamide (DHEBA) , can also be added. Volume transmission gratins and holographic lens have been fabricated in this photopolymer but not researches have been done to store reflection gratins. Is know that for higher spatial frequencies, the diffraction efficiency decreases considerably as the spatial frequency increases. In this sense, the general aim of this work has been fabricated reflection gratings in the symmetrical experimental setup in “Biophotopol” and to study the dependence of diffraction efficiency on physical thickness, recording intensity and exposure energy. First, films physical thickness was investigated. The maximum diffraction efficiency was obtained for thicknesses around 145 µm. The photopolymer layers uniformity was highly sensitive to drying and environmental conditions during the exposure stage. Therefore, both conditions were investigated and very controlled. An increase in diffraction efficiency was observed when the photopolymer films were cured with a LED lamp to improve the stability of the reflection holograms. The residual dye is eliminated during this process. The maximums diffraction efficiencies around 30 % were obtained for reflection gratings with a spatial frequency of 4738 lines/mm. The index modulation and optical thickness were obtained by fitting procedure through coupled wave theory. Experimental and theoretical results have been interpreted to modify the photopolymer formulation and exposure conditions in order to increase the diffraction efficiencies.

Proceedings Article | 7 September 2018 Paper

Anamorphic characterization of a PA-LCoS based holographic data storage system

Francisco J. Martínez-Guardiola, Andrés Márquez, Eva Calzado, Roberto Fernández, Cristian Neipp, Manuel Ortuño, Inmaculada Pascual, Sergi Gallego

Proceedings Volume 10751, 1075112 (2018) https://doi.org/10.1117/12.2321276

KEYWORDS: Image resolution, Holographic data storage systems, CCD cameras, Error analysis, Liquid crystal on silicon, Statistical analysis, Image filtering, Binary data, Image retrieval, Beam splitters

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Proceedings Article | 7 September 2018 Presentation + Paper

Versatile simplified physical model for parallel aligned liquid crystal devices

Andrés Márquez, Francisco Martínez-Guardiola, Jorge Francés, Sergio Bleda, Mariela Alvarez, Inmaculada Pascual, Sergi Gallego, Augusto Beléndez

Proceedings Volume 10751, 1075106 (2018) https://doi.org/10.1117/12.2321054

KEYWORDS: Instrument modeling, Liquid crystals, Calibration, LCDs, Modulation, Liquid crystal on silicon, Spatial light modulators, Polarimetry, Birefringence, Molecules

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SPIE Journal Paper | 24 March 2018

Computational split-field finite-difference time-domain evaluation of simplified tilt-angle models for parallel-aligned liquid-crystal devices

Andrés Márquez, Jorge Francés, Francisco Martínez, Sergi Gallego, Mariela Álvarez, Eva Calzado, Inmaculada Pascual, Augusto Beléndez

OE, Vol. 57, Issue 03, 037110, (March 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.3.037110

KEYWORDS: Finite-difference time-domain method, Instrument modeling, Liquid crystals, Refractive index, Optical engineering, Liquid crystal on silicon, Birefringence, Refraction, Glasses, Computer simulations

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Proceedings Article | 12 September 2017 Presentation + Paper

SF-FDTD analysis of a predictive physical model for parallel aligned liquid crystal devices

Andrés Márquez, Jorge Francés, Francisco Martínez, Sergi Gallego, Mariela Alvarez, Eva Calzado, Inmaculada Pascual, Augusto Beléndez

Proceedings Volume 10395, 1039509 (2017) https://doi.org/10.1117/12.2273924

KEYWORDS: Instrument modeling, Finite-difference time-domain method, Reverse modeling, LCDs, Liquid crystals, Refractive index, Modulation, Computer simulations, Liquid crystal on silicon, Reflectivity

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Proceedings Article | 24 August 2017 Paper

Polarimetric and diffractive evaluation of 3.74 micron pixel-size LCoS in the telecommunications C-band

Mi Wang, Francisco Martínez, Andrés Márquez, Yabin Ye, Liangjia Zong, Inmaculada Pascual, Augusto Beléndez

Proceedings Volume 10395, 103951J (2017) https://doi.org/10.1117/12.2277451

KEYWORDS: Liquid crystal on silicon, Telecommunications, Liquid crystals, Polarimetry, Switches, Optical interconnects, Image processing, Birefringence, Networks

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Proceedings Article | 15 May 2017 Paper

Multiplexed holograms recorded in a low toxicity Biophotopol photopolymer

Víctor Navarro-Fuster, Manuel Ortuño, Sergi Gallego, Roberto Fernández, Francisco Martínez-Guardiola, Andrés Márquez, Inmaculada Pascual

Proceedings Volume 10233, 102331O (2017) https://doi.org/10.1117/12.2264903

KEYWORDS: Humidity, Argon ion lasers, Holography, Diffraction, Multiplexing, Diffraction gratings, Holograms, Toxicity, Holographic materials, Holographic optical elements, Sensors, Photonics

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Proceedings Article | 14 September 2016 Paper

PVA/AA photopolymers and PA-LCoS devices combined for holographic data storage

Andrés Márquez, Francisco Martínez, Roberto Fernández, Sergi Gallego, Mariela Álvarez, Inmaculada Pascual, Augusto Beléndez

Proceedings Volume 9970, 997008 (2016) https://doi.org/10.1117/12.2236113

KEYWORDS: Holography, Photopolymers, Modulation, Spatial light modulators, Binary data, Holographic data storage systems, Data storage, Liquid crystal on silicon, Phase shift keying, Polarizers

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Proceedings Article | 27 April 2016 Paper

Analysis of holographic data storage using a PA-LCoS device

Francisco Martínez, Andrés Márquez, Sergi Gallego, Sandra Fenoll, Manuel Ortuño, Jorge Francés, Sergio Bleda, Inmaculada Pascual

Proceedings Volume 9889, 988922 (2016) https://doi.org/10.1117/12.2227948

KEYWORDS: LCDs, Spatial light modulators, Modulation, Holographic data storage systems, Phase shift keying, Holography, Liquid crystal on silicon, Binary data, Signal processing, Data storage, Spatial light modulators, Amplitude modulation, Polarizers

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Proceedings Article | 27 April 2016 Paper

Efficient split field FDTD analysis of third-order nonlinear materials in two-dimensionally periodic media

Jorge Francés, Sergio Bleda, Subhajit Bej, Jani Tervo, Víctor Navarro-Fuster, Sandra Fenoll, Francisco J. Martínez-Gaurdiola, Cristian Neipp

Proceedings Volume 9889, 988908 (2016) https://doi.org/10.1117/12.2227542

KEYWORDS: Binary data, Numerical analysis, Nonlinear filtering, Waveguide modes, Finite-difference time-domain method, Waveguides, Binary data, Numerical analysis, Polarization, Titanium dioxide, Computer simulations, Electromagnetism, Radio propagation

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Proceedings Article | 9 September 2015 Paper

Static and dynamic effects of flicker in phase multilevel elements on LCoS devices

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 9598, 95980C (2015) https://doi.org/10.1117/12.2188039

KEYWORDS: Diffraction, Diffraction gratings, Liquid crystal on silicon, Quantization, Calibration, Spatial light modulators, Modulation, Polarimetry, Phase shift keying, Reverse modeling

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Proceedings Article | 19 September 2014 Paper

Influence of the photopolymer properties in the fabrication of diffractive optical elements

Sergi Gallego, Roberto Fernández, Andrés Márquez, Francisco Martínez, Cristian Neipp, Manuel Ortuño, Jorge Francés, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 9216, 921619 (2014) https://doi.org/10.1117/12.2060990

KEYWORDS: Polymers, Diffractive optical elements, Refractive index, Diffusion, Holography, Binary data, Absorption, Signal attenuation, Ions, Optical components

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Proceedings Article | 19 September 2014 Paper

Averaged Stokes polarimetry applied to characterize parallel-aligned liquid crystal on silicon displays

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 9216, 92160H (2014) https://doi.org/10.1117/12.2061581

KEYWORDS: Polarimetry, Liquid crystal on silicon, Wave plates, LCDs, Polarization, Poincaré sphere, Calibration, Modulation, Instrument modeling, Electro optical modeling

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SPIE Journal Paper | 24 June 2014

Electrical dependencies of optical modulation capabilities in digitally addressed parallel aligned liquid crystal on silicon devices

Francisco Javier Martínez, Andrés Márquez, Sergi Gallego, Manuel Ortuño, Jorge Francés, Augusto Beléndez, Inmaculada Pascual

OE, Vol. 53, Issue 06, 067104, (June 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.6.067104

KEYWORDS: Modulation, Liquid crystal on silicon, Phase shift keying, Polarimetry, Polarizers, Calibration, Quantization, Optical engineering, Spatial light modulators, LCDs

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SPIE Journal Paper | 21 January 2014

Extended linear polarimeter to measure retardance and flicker: application to liquid crystal on silicon devices in two working geometries

Francisco Martínez, Andrés Márquez, Sergi Gallego, Jorge Frances, Inmaculada Pascual

OE, Vol. 53, Issue 01, 014105, (January 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.1.014105

KEYWORDS: Polarimetry, Liquid crystal on silicon, Beam splitters, Wave plates, Liquid crystals, Polarizers, LCDs, Optical engineering, Error analysis, Radiometry

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Proceedings Article | 26 September 2013 Paper

Study of the modulation capabilities of parallel aligned liquid crystal on silicon displays

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 8855, 885504 (2013) https://doi.org/10.1117/12.2023266

KEYWORDS: Liquid crystal on silicon, Modulation, Phase shift keying, Polarizers, LCDs, Calibration, Polarimetry, Wave plates, Spatial light modulators, Resistors

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Proceedings Article | 26 September 2013 Paper

Analysis of the fabrication of diffractive optical elements in photopolymers

S. Gallego, A. Márquez, R. Fernández, Á. Piera, F. Martínez-Gaurdioloa, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 8855, 88550V (2013) https://doi.org/10.1117/12.2023861

KEYWORDS: Photopolymers, Diffractive optical elements, Linear filtering, Diffusion, LCDs, Refractive index, Optical filters, Polymers, Binary data, Spatial frequencies

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SPIE Journal Paper | 28 August 2013

Acceleration of split-field finite difference time-domain method for anisotropic media by means of graphics processing unit computing

Jorge Francés, Sergio Bleda, Mariela Alvarez, Francisco Martinez, Andres Marquez, Cristian Neipp, Augusto Beléndez

OE, Vol. 53, Issue 01, 011005, (August 2013) https://doi.org/10.1117/12.10.1117/1.OE.53.1.011005

KEYWORDS: Diffraction, Finite-difference time-domain method, Diffraction gratings, Polarization, Binary data, Dielectric polarization, Dielectrics, Graphics processing units, Optical engineering, Electromagnetism

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Proceedings Article | 15 October 2012 Paper

Analysis of periodic anisotropic media by means of split-field FDTD method and GPU computing

J. Francés, S. Bleda, M. Álvarez López, F. Martínez, A. Márquez, C. Neipp, A. Beléndez

Proceedings Volume 8498, 84980K (2012) https://doi.org/10.1117/12.929545

KEYWORDS: Finite-difference time-domain method, Binary data, Dielectrics, Computer simulations, Liquid crystals, Electromagnetism, Numerical analysis, Computing systems, Dielectric polarization, Visualization

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Proceedings Article | 15 October 2012 Paper

Classical polarimetric method revisited to analyse the modulation capabilities of parallel aligned liquid crystal on silicon displays

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 8498, 84980L (2012) https://doi.org/10.1117/12.929677

KEYWORDS: Liquid crystal on silicon, Wave plates, Polarimetry, Modulation, Polarizers, Phase shift keying, LCDs, Radiometry, Beam splitters, Oscilloscopes

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Proceedings Article | 5 May 2012 Paper

Analysis of the geometry of a holographic memory setup

A. Márquez, E. Fernández, F. J. Martínez, S. Gallego, M. Ortuño, A. Beléndez, I. Pascual

Proceedings Volume 8429, 84291Y (2012) https://doi.org/10.1117/12.921294

KEYWORDS: Holography, Binary data, Fourier transforms, Wavefronts, Optical correlators, Data storage, Beam splitters, Optical signal processing, Lenses, Cameras

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Showing 5 of 27 publications

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