Ainara Rodríguez

Ainara Rodríguez
CEIT Centro de Estudios e Investigaciones Técnicas de Gipuzkoa | CEIT · Department of Materials

PhD

About

63
Publications
7,401
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692
Citations
Additional affiliations
April 2015 - present
CEIT Centro de Estudios e Investigaciones Técnicas de Gipuzkoa
Position
  • Researcher
January 2010 - April 2015
CIC microGUNE
Position
  • Researcher

Publications

Publications (63)
Article
Laser-Induced Periodic Surface Structures (LIPSS) manufacturing is a convenient laser direct-writing technique for the fabrication of nanostructures with adaptable characteristics on the surface of virtually any material. In this paper, we study the influence of 1D laser wavefront curvature on nanoripples spatial regularity, by irradiating stainles...
Article
Full-text available
A diffractive optical element was fabricated by monolithically integrating two volume phase-gratings (VPGs) in the bulk of a single-piece transparent material. A computer model of the diffraction generated by the double volume phase-grating (DVPG) was made with a rigorous coupled wave analysis simulator. Simulations and experiments show that the di...
Article
A fast and reliable method for the fabrication of polarization modifying devices using femtosecond laser is reported. A setup based on line focusing is used for the generation of LIPSS on stainless steel, processing at different speeds between 0.8 and 2.4 mm/s with constant energy per pulse of 1.4 mJ. SEM and AFM characterizations of the LIPSS show...
Article
The control of the interaction between materials and biological tissues is a key factor to optimize the overall performance of implants and prostheses integrated into the body. With this objective in mind, biomimetic hierarchical one- and two-dimensional surface patterns textured at the micro and nano scales were fabricated on titanium alloys using...
Conference Paper
Laser induced periodic surface structures (LIPSS) can be studied as waveplates due to the birefringence induced by the nanoripples, with easy fabrication since they are fabricated in a one-step process by laser, where LIPSS geometry are defined by the characteristics of the laser and the substrate. The optical properties of these waveplates are def...
Conference Paper
Volume-phase gratings (VPGs) are fabricated in CdSxSe1-x quantum dot doped borosilicate glass at different repetition rates. As the heat accumulation effects caused by the repetition rate lead to changes in the diameter of the modified volume (from 1 to 10 μm), the selective fabrication of thick or thin gratings can be benefitted when the different...
Conference Paper
LIPSS are an emergent method of fabricating functional surfaces. A high repetition rate ultrashort pulsed laser was used to generate LIPSS on metallic surfaces. Different combinations of the processing parameters were tested to study their effect on the period of the LIPSS. Additionally, the influence of the repetition rate (laser frequency) on the...
Conference Paper
Surface nanostructuring has received increasing attention in recent years due to the wide range of applications in which it offers advantages. Particularly, Laser-Induced Periodic Surface Structures (LIPSS) have proven useful for surface functionalization. LIPSS are periodic formations generated in most materials when irradiated with linearly polar...
Conference Paper
Since the first refractive index modification of transparent materials was achieved via femtosecond laser micromachining [1], the fabrication of bulk inscribed 3D optical elements has been insistently pursued. This method has been extensively used to generate a variety of photonic devices such as waveguides, couplers or amplifiers, which enabled a...
Article
Volume-phase gratings (VPGs) were fabricated in CdSxSe1−x quantum-dot-doped borosilicate glass at a low repetition rate (800 nm, 140 fs, 1 kHz). The VPGs were designed based on rigorous coupled wave analysis simulations. Results indicate that the inscribed thickness (L) is the key parameter to maximize the diffraction efficiency at order 1. Microsc...
Conference Paper
Birefringence induced by nanoripples generated by laser (Laser Induced Periodic Surface Structures, LIPSS), enables their use as polarization gratings. Their fabrication is simple, as LIPSS geometry is defined by the characteristics of the laser and the substrate in a one-step process. In this work LIPPS generated on stainless steel have been used...
Article
Full-text available
A combination of atomic layer deposition and photolithography is applied to fabricate interdigitated electrodes of aluminum‐doped zinc oxide embedded in polyethylene terephthalate substrates. Various designs with different gap to widths ratios are realized and important characteristics of the electrodes, including thickness, surface roughness, and...
Article
Full-text available
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
Article
Full-text available
We demonstrate a rapid, accurate, and convenient method for tailoring the optical properties of diamond surfaces by employing laser induced periodic surface structuring (LIPSSs). The characteristics of the fabricated photonic surfaces were adjusted by tuning the laser wavelength, number of impinging pulses, angle of incidence and polarization state...
Conference Paper
Full-text available
Fabricating reflective waveplates using nanostructured surfaces has taken great interest in recent years due to their simple structure: a diffractive grating composed of ripples with subwavelength period. The surface ripples act as an artificial birefringent material: the anisotropy of the surface cor-rugation generates a phase delay between two pe...
Article
ZnO thin film sputtered on alumina substrate is processed by Direct Laser Interference Patterning (DLIP). The heat transfer equation has been simulated for interference patterns with a period of 730 nm and two different fluences (85 mJ/cm² and 165 mJ/cm²). A thermal threshold of 900 K, where crystal modification occurs has been calculated, indicati...
Article
Full-text available
We demonstrate the formation of laser-induced periodic surface structures (LIPSS) in boron-doped diamond (BDD) by irradiation with femtosecond near-IR laser pulses. The results show that the obtained LIPSS are perpendicular to the laser polarization, and the ripple periodicity is on the order of half of the irradiation wavelength. The surface struc...
Conference Paper
In this work, polyethylene terephthalate (PET) and polyimide (PI) films of 125 m, two polymers commonly used for inkjet printing, have been processed with a Ti:Sapphire laser system which generates 130 fs pulses at a central wavelength of 800 nm, with a 1 kHz repetition rate. A study of the formation of surface micro/nanostructures was performed b...
Conference Paper
We have fabricated and characterized a volume polarization grating in fused silica using a femtosecond laser. We studied the near-field intensity distribution and detect the high-contrast Talbot planes. Using the inverse difraction problem we estimated the refractive indices.
Conference Paper
The capability to enhance water condensation rate through the use of surfaces with controlled wettability, could dramatically improve technical applications ranging from the chemical to the power industry. Furthermore, any improvements in cycle efficiency would have a profound effect on important industrial areas such as power generation and water...
Article
Full-text available
We study the fabrication of photonic surface structures in single crystal diamond by means of highly controllable direct femtosecond UV laser induced periodic surface structuring. By appropriately selecting the excitation wavelength, intensity, number of impinging pulses and their polarization state, we demonstrate emerging high quality and fidelit...
Article
Full-text available
The precise control over the interaction between cells and the surface of materials plays a crucial role in optimizing the integration of implanted biomaterials. In this regard, material surface with controlled topographic features at the micro- and nano-scales has been proved to affect the overall cell behavior and therefore the final osseointegra...
Article
Full-text available
Ultrafast laser inscription of volume phase gratings with low index contrast and self-images with visibility of 0.96 is demonstrated. It is also demonstrated that phase differences of π/2 for visible light are achievable with only one layer of structures induced in bulk borosilicate glass by direct laser writing. The fabrication method avoids the s...
Article
In this work, submicro and nanostructures self-formed on the surface of Platinum thin films under femtosecond laser-pulse irradiation are investigated. A Ti:Sapphire laser system was used to linearly scan 15 mm lines with 100 fs pulses at a central wavelength of 800 nm with a 1 kHz repetition rate. The resulting structures were characterized by sca...
Conference Paper
Full-text available
In the last years the social conscience towards climate change and greenhouse effect, as well as the restrictive laws against gas emissions, have increased. These facts lead into a need for the air quality monitoring on a real-time basis. Nowadays, several specialized measurement systems can be found in the market. However, these are usually too bu...
Conference Paper
In this work the near field diffraction of volume phase gratings fabricated by ultrafast laser inscription in glass is analyzed. It has been found that the increment of the gratings thickness produces widening of the region in which visibility remains above the 75% of its maximum. Result that may increase mechanical tolerance of devices based on Ta...
Conference Paper
in this manuscript we propose a novel sensor based on surface diffraction gratings. The sensor is based in the change of the refractive index induced by a gas in the material of the grating. The new sensor was designed, simulated, fabricated and tested. It has been demonstrated the generation of a 10 mV electrical signal for a SO2 concentration of...
Conference Paper
Micro polishing of metal surfaces by means of pulsed laser has attracted increased interest in the last decade, especially due to the precision it offers and the absence of waste byproducts in relation to traditional mechanical abrasive methods. The process for micro laser polishing requires melting a thin surface layer in order to reduce the rough...
Conference Paper
The manufacturing of metal surfaces with highly controllable wetting properties is becoming a very active and promising area in research and engineering. Based on nature examples like rose petals or lotus effect, an effective approach for this purpose is the combination of micro- and nano-structures into hierarchical structures. Traditionally these...
Conference Paper
En los últimos años han venido desarrollándose nuevas tecnologías de fabricación que permiten la obtención de piezas de gran complejidad geométrica, como pueden ser las nuevas herramientas de corte, el control de precisión mediante el desarrollo de soluciones robóticas complejas o la fabricación aditiva en el caso específico del láser. Con esta últ...
Conference Paper
Full-text available
In this work the first electrochemical genosensor based on thin-film gold electrodes deposited onto Cyclo Olefin Polymer (COP) substrates was fabricated for the detection of Campylobacter spp in food matrices
Conference Paper
The surface morphology of a Niobium sample, irradiated in air by a femtosecond laser with a wavelength of 800 nm and pulse duration of 100 fs, was examined. The period of the micro/nanostructures, parallel and perpendicularly oriented to the linearly polarized fs-laser beam, were studied by means of 2D Fast Fourier Transform analysis. The observed...
Conference Paper
The influence of filamentation and longitudinal spherical aberrations on the geometry of the laser induced refractive index change in borosilicate glass was studied. Measurements of the structures geometry were compared with a model based on the combined effect of self-focusing and longitudinal spherical aberration produced by the air-glass surface...
Article
Full-text available
The surface morphology of a Niobium sample, irradiated in air by a femtosecond laser with a wavelength of 800 nm and pulse duration of 100 fs, was examined. The period of the micro/nanostructures, parallel and perpendicularly oriented to the linearly polarized fs-laser beam, was studied by means of 2D Fast Fourier Transform analysis. The observed L...
Conference Paper
Full-text available
Laser Induced Periodic Surface Structures (LIPSS) have been observed in a wide range of materials including semiconductors, dielectrics and metals. However, the optimal conditions for controllable nanostructuring of metallic thin films using femtosecond laser ablation technique are still unexplored. In this work we present a systematic study of the...
Article
A study of the influence of annealing temperature on the structural, morphological and optical properties of WO3 thin films is presented. The coatings are deposited by RF reactive magnetron sputtering and characterized by XRD analysis and FESEM. The XRD diagrams of the samples show a phase transition from tetragonal to monoclinic when the annealing...
Article
Full-text available
Metallic gratings were fabricated using high energy laser interference lithography with a frequency tripled Nd:YAG nanosecond laser. The grating structures were first recorded in a photosensitive layer and afterwards transferred to an Au film. High quality Au gratings with a period of 770 nm and peak-to-valley heights of 20-60 nm exhibiting plasmon...
Conference Paper
Full-text available
The ability to fabricate structures on the nanoscale with high precision and in a wide variety of materials is a crucial issue for the development of the nanoscience and nanotechnology. High resolution lithographic techniques such as electron-beam lithography or EUV lithography, although very accurate and reproducible, usually suffer from low throu...
Article
This work presents the fabrication of hollow-core metallic structures with a complete laser interference lithography (LIL) process. A negative photoresist is used as sacrificial layer. It is exposed to the pattern resulting from the interference of two laser beams, which produces a structure of photoresist lines with a period of 600 nm. After devel...
Article
The production of periodic structures in silicon wafers by four-beam is presented. Because laser interference ablation is a single-step and cost-effective process, there is a great technological interest in the fabrication of these structures for their use as antireflection surfaces. Three different laser fluences are used to modify the silicon sur...
Article
We have fabricated polystyrene opals by vertical deposition with colloidal spheres of 419 nm in diameter. Different parameters such as the concentration, temperature and relative humidity have been systematically varied in order to study the dependence of the crystalline quality of the opals on these parameters. The opals have been optically and st...
Chapter
The discovery of novel material properties at the nanoscale has aroused a great amount of interest in the fabrication of structures at the sub-micro and nano scales. In this chapter the most promising non-conventional sub-micro and nano fabrication techniques together with the optical characterization techniques which have been developed in recent...
Conference Paper
Full-text available
There is a wide variety of techniques that can be applied to the fabrication of microfluidic devices. Although plastic devices are getting increased interest for microfluidic applications, glass is still the preferred material due to the following reasons: it is chemically inert, optically transparent, stable in time, easily cleaned and hydrophilic...
Chapter
Industrial end-users are currently discouraged from expanding their nanotechnologyrelated business activities by either unacceptably high costs or the impossibility to control production processes on a nanometric scale. There are mainly three lithography technologies available for structuring of nano features: ion beam lithography, electron beam li...
Article
Periodic structures are of increasing interest in many fields such as nanotechnology and biotechnology among others. Laser Interference Lithography (LIL) has been widely studied for the fabrication of periodic structures. However, a LIL tool for the nanoscale structuring of materials that can scale beyond laboratory prototypes into cost effective i...
Article
High throughput and low cost fabrication techniques in the sub-micrometer scale are attractive for the industry. Laser interference lithography (LIL) is a promising technique that can produce one, two and three-dimensional periodical patterns over large areas. In this work, two- and four-beam laser interference lithography systems are implemented t...
Article
Full-text available
Laser interference lithography (LIL) is concerned with the use of interference patterns generated from two or several coherent beams of laser radiation for the structuring of materials. This paper presents the work on the processes based on resists and direct writing with laser interference lithography. In the work, a four-beam laser interference s...
Conference Paper
This paper presents a system requirement analysis of multi-beam laser interference nanolithography for nanoscale structuring of materials including seven sections: introduction, formation of multi-beam laser interference patterns, user requirements, system architecture, experiments, discussions and conclusions. Analytical expressions were obtained...
Article
This paper presents a theoretical analysis of formation of 4-beam laser interference patterns for nanolithography. Parameters of 4-beam interference patterns including the pattern amplitude, period, orientation and uniformity were discussed. Analytical expressions were obtained for the spatial distribution of radiation of the interfering beams as a...
Article
Multi-beam laser interference lithography (MB-LIL) is a rapid and cost-effective maskless optical lithography technique to parallelly pattern periodic or quasi- periodic micro/nano-structured material over large areas more than square centimetres. An interference pattern between two or more coherent laser beams is set up and recorded in a recording...

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Projects

Projects (2)
Project
Nanostructuring metal surfaces with the help of ultra-short pulse laser to improve their properties (dental implants, linear encoders, batteries). www.laser4surf.eu
Project
Development of high resolution fabrication processes for linear encoders Design and exploit the possibilities of ultrafast processes in glass