Daniel Puerto
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View article: Customized PVA/AA diffraction gratings by high repetition rate femtosecond direct laser writing
Customized PVA/AA diffraction gratings by high repetition rate femtosecond direct laser writing Open
In this work, we investigate the behavior of poly(vinyl alcohol)/acrylamide photopolymers (PVA/AA) under high repetition rate (1 kHz – 1 MHz), multipulse (1 – 20), femtosecond (450 fs) laser irradiation at λ=515 nm, varying fluence values …
View article: Controlled photothermal ablative processing of commercial polymers minimizing undesired thermal effects under high frequency femtosecond laser irradiation
Controlled photothermal ablative processing of commercial polymers minimizing undesired thermal effects under high frequency femtosecond laser irradiation Open
The response of three commercial polymers (poly(vinyl chloride) (PVC), poly(ethylene terephthalate) (PET) and polypropylene (PP)) with different thermal properties under high repetition rates (1 kHz-1 MHz) with femtosecond (450 fs) multi-p…
View article: Control of processing effects under high-frequency femtosecond laser irradiation on three commercial polymers with different thermal properties
Control of processing effects under high-frequency femtosecond laser irradiation on three commercial polymers with different thermal properties Open
The behavior of three commonly used commercial polymers (poly(vinyl chloride) (PVC), poly(ethylene terephthalate) (PET) and polypropylene (PP)) under high repetition rate (10 kHz – 1 MHz) femtosecond (450 fs) laser irradiation at λ=515 nm …
View article: The role of absorption mechanism on the optimization of processing commercial polymers under high repetition rate femtosecond laser irradiation
The role of absorption mechanism on the optimization of processing commercial polymers under high repetition rate femtosecond laser irradiation Open
The response of three of the most used commercial polymers (poly(vinyl chloride) (PVC), poly(ethylene terephthalate) (PET) and polypropylene (PP)) under irradiation with high repetition rate (1 kHz–1 MHz) femtosecond (450 fs) multi-pulse (…
View article: Study of the conservation of different holograms sandwiched between glasses
Study of the conservation of different holograms sandwiched between glasses Open
Photopolymers are designed and engineered with versatile applications including optics and photonics. Holography is one of the classical porpoises that use photopolymers as holographic recording materials. The success of these materials ca…
View article: Liquid crystal doped photopolymer micro-droplets printed by a simple and clean laser-induced forward transfer process
Liquid crystal doped photopolymer micro-droplets printed by a simple and clean laser-induced forward transfer process Open
We print a tunable photopolymer (photopolymer dispersed liquid crystal -PDLC), using the laser-induced direct transfer technique without absorber layer, which was a challenge for this technique given the low absorption and high viscosity o…
View article: High-frequency processing effects on three commercial polymers with different thermal properties under femtosecond laser irradiation
High-frequency processing effects on three commercial polymers with different thermal properties under femtosecond laser irradiation Open
The response of three of the most used commercial polymers (poly(vinyl chloride) (PVC), poly(ethylene terephthalate) (PET) and polypropylene (PP)) with different thermal properties under irradiation with high frequency (1 kHz-1 MHz) femtos…
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: Discovering light: an alternative approach to the teaching of optics and photonics in primary and secondary school
Discovering light: an alternative approach to the teaching of optics and photonics in primary and secondary school Open
We present a different approach to the teaching of optics in primary and secondary school which focuses on the development of hands-on experiments, enabling young students to have a closer look to optics and photonics.
View article: Polarimetric analysis of cross-talk phenomena induced by the pixelation in PA-LCoS devices
Polarimetric analysis of cross-talk phenomena induced by the pixelation in PA-LCoS devices Open
Liquid crystal on silicon (LCoS) microdisplays are an element commonly found in advanced photonic applications. Phase-only modulation and spatial light modulators (SLMs) use parallel-aligned LCoS (PA-LCoS) microdisplays due to their large …
View article: Precise-Integration Time-Domain Formulation for Optical Periodic Media
Precise-Integration Time-Domain Formulation for Optical Periodic Media Open
A numerical formulation based on the precise-integration time-domain (PITD) method for simulating periodic media is extended for overcoming the Courant-Friedrich-Levy (CFL) limit on the time-step size in a finite-difference time-domain (FD…
View article: Estimation of the speed of sound waves using a modular 3D printed Helmholtz resonator
Estimation of the speed of sound waves using a modular 3D printed Helmholtz resonator Open
This work shows the redesign of an elemental experience based on the Helmholtz resonator using 3D printing. A Helmholtz resonator is based on a volume and at least one opening that can include a tube or not. The air column inside the tube …
View article: Tunable Waveguides Couplers Based on HPDLC for See-Through Applications
Tunable Waveguides Couplers Based on HPDLC for See-Through Applications Open
Photopolymers have become an important recording material for many applications, mainly related to holography. Their flexibility to change the chemical composition together with the optical properties made them a versatile holographic reco…
View article: Discovering light: an alternative approach to the teaching of optics & photonics in primary and secondary school
Discovering light: an alternative approach to the teaching of optics & photonics in primary and secondary school Open
We present a different approach to the teaching of optics in primary and secondary school which focuses on the development of hands-on experiments, enabling young students to have a closer look to optics and photonics.
View article: Anisotropic Resistivity Surfaces Produced in ITO Films by Laser‐Induced Nanoscale Self‐organization
Anisotropic Resistivity Surfaces Produced in ITO Films by Laser‐Induced Nanoscale Self‐organization Open
Highly anisotropic resistivity surfaces are produced in indium tin oxide (ITO) films by nanoscale self‐organization upon irradiation with a fs‐laser beam operating at 1030 nm. Anisotropy is caused by the formation of laser‐induced periodic…
View article: Accurate, Efficient and Rigorous Numerical Analysis of 3D H-PDLC Gratings
Accurate, Efficient and Rigorous Numerical Analysis of 3D H-PDLC Gratings Open
This work presents recent results derived from the rigorous modelling of holographic polymer-dispersed liquid crystal (H-PDLC) gratings. More precisely, the diffractive properties of transmission gratings are the focus of this research. Th…
View article: Phase-Shift Optimization in AA/PVA Photopolymers by High-Frequency Pulsed Laser
Phase-Shift Optimization in AA/PVA Photopolymers by High-Frequency Pulsed Laser Open
Photopolymers can be used to fabricate different holographic optical elements, although maximization of the phase-shift in photopolymers has been a challenge for the last few decades. Different material compositions and irradiation conditi…
View article: Analysis of the Imaging Characteristics of Holographic Waveguides Recorded in Photopolymers
Analysis of the Imaging Characteristics of Holographic Waveguides Recorded in Photopolymers Open
In this work, we study the imaging characteristics of an optical see-through display based on a holographic waveguide. To fabricate this device, two transmission holograms are recorded on a photopolymer material attached to a glass substra…
View article: 3-dimensional modelling of the DOEs formation in PVA/AA photopolymers
3-dimensional modelling of the DOEs formation in PVA/AA photopolymers Open
Photosensitive materials and optical information processing technologies based on holographic and photonic techniques are suffering a huge improvement. Furthermore Spatial Light Modulators (SLMs) based on LCoS microdisplays (PALCoS) open n…
View article: Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettability
Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettability Open
The replication of complex structures found in nature represents an enormous challenge even for advanced fabrication techniques, such as laser processing. For certain applications, not only the surface topography needs to be mimicked, but …