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Autor Alda, Javier |
Documentos disponibles escritos por este autor (63)
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Mora Ventura, Brhayllan ; Díaz de León, Ramón ; García Torales, Guillermo ; Flores, Jorge L. ; Alda, Javier ; González, Francisco Javier | SPIE | 2015-09-04Recently thermo-electrical nanoantennas, also known as Seebeck nanoantennas, have been proposed as an alternative for solar energy harvesting applications. In this work we present the optical and thermal analysis of metallic nanoantennas operati[...]texto impreso
Cuadrado, Alexander ; López-Alonso, José Manuel ; Martínez Antón, Juan Carlos ; Ezquerro Rodríguez, José Miguel ; González, Francisco Javier ; Alda, Javier | SPIE | 2015-08-28Fractal antennas have been proposed to improve the bandwidth of resonant structures and optical antennas. Their multiband characteristics are of interest in radiofrequency and microwave technologies. In this contribution we link the geometry of [...]texto impreso
Abstract The longitudinal and transverse angular shifts in the refraction of a paraxial beam are calculated by using the plane-wave decomposition of the amplitude of the electric field distribution of the incident beam. The transmission coeffici[...]texto impreso
Alda, Javier ; López-Alonso, José Manuel ; Boreman, Glenn ; Rico-García, José María | Puntex | 2005-05La investigación sobre el comportamiento de estructuras metálicas cuyo tamaño es comparable a la longitud de onda de la radiación detectada puede realizarse considerándolas como antenas detectoras de radiación óptica. El diseño, análisis y carac[...]texto impreso
Se ha aplicado una herramienta automática de análisis de textos, Wordsmith, para la obtención de información cuantitativa acerca del contenido de foros en un entorno de enseñanza virtual sin requerir la intervención humana en su lectura. Se ha p[...]texto impreso
Rico-García, José María ; Sánchez Brea, Luis Miguel ; Alda, Javier | The Optical Society Of America | 2008-02-20A tomographiclike method based on the inverse radon transform is used to retrieve the irradiance map of a focused laser beam. The results obtained from multiple knife-edge measurements have been processed through a kriging technique. This techni[...]texto impreso
Elshorbagy, Mahmoud Hamdy Mohamed ; Abdel-Hady, Kamal ; Kamal, Hala ; Alda, Javier | Elsevier Science BV | 2017-01-07Absorption of amorphous-Si hydrogenated (aSi-H) solar cells can be enhanced by using dielectric nanostructures made of Si3N4 that work like antireflection coatings. The analysis focus on the short-circuit current delivered by the cell under sola[...]texto impreso
López Alonso, José Manuel ; Grumel, Eduardo ; Cap, Nelly Lucía ; Trivi, Marcelo ; Rabal, Héctor ; Alda, Javier | SPIE | 2015-09-09Speckle is being used as a characterization tool for the analysis of the dynamic of slow varying phenomena occurring in biological and industrial samples. The retrieved data takes the form of a sequence of speckle images. The analysis of these i[...]texto impreso
FDTD algorithms are being used as a numeric tool for the analysis of photonic crystals. The definition of the modes associated with them is of interest for the study of the capabilities of photonic crystal devices. The Principal Component Analys[...]texto impreso
Rico-García, José María ; López-Alonso, José Manuel ; Alda, Javier | OSA (Optical Society of America) Publishing | 2005-05-16The manufacture of a photonic crystal always produce deviations from the ideal case. In this paper we present a detailed analysis of the influence of the manufacture errors in the resulting electric field distribution of a photonic crystal micro[...]texto impreso
Briones, Edgar ; Briones, Joel ; Cuadrado, Alexander ; Mc Murtry, Stefan ; Hehn, Michel ; Montaigne, François ; Alda, Javier ; González, Francisco Javier | ARXIV | 2014-01-20Thermo-electrical nanoantennas have been proposed as an alternative option for conversion solar energy harvesting applications. In this work, the response of a spiral broadband antenna has been obtained from numerical and theoretical simulations[...]texto impreso
Kamal Abd El-Hady, Hala ; Alda, Javier ; Vázquez Moliní, Daniel ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2004In this paper we analyze different alternatives in the design of optimized optical arrays having spatial integration feature in a plane arrangement. More specifically, we focus our attention in the evaluation of the number of useful individual u[...]texto impreso
Alda, Javier ; Rico-García, José María ; López-Alonso, José Manuel ; Lail, Brian | Elsevier | 2006-04-15The design of plane Fresnel zone plates, and binary-staircase kinoforms, has been analyzed in this paper for a non-imaging application aimed to increase the performance of point-like detectors. They maximize the irradiance at the focal point of [...]texto impreso
Kolosovas Machuca, Eleazar Samuel ; Cuadrado Conde, Alexander ; Ojeda Galván, Hiram Joazet ; Ortiz Dosal, Luis Carlos ; Hernández Arteaga, Aida Catalina ; Rodríguez Aranda, María del Carmen ; Navarro Contreras, Hugo Ricardo ; Alda, Javier ; González Contreras, Francisco Javier | MDPI | 2019-02-06In this paper, we report a fast and easy method to detect histamine dihydrochloride using gold nanostars in colloidal aqueous solution as a highly active SERS platform with potential applications in biomedicine and food science. This colloid was[...]texto impreso
Cuadrado, Alexander ; López-Alonso, José Manuel ; Martínez Antón, Juan Carlos ; Ezquerro Rodríguez, José Miguel ; González, Francisco Javier ; Alda, Javier | SPIE | 2015-08-28The practical application of optical antennas in detection devices strongly depends on its ability to produce an acceptable signal-to-noise ratio for the given task. It is known that, due to the intrinsic problems arising from its sub-wavelength[...]texto impreso
Alda, Javier ; Sánchez Brea, Luis Miguel ; Salgado Remacha, Francisco Javier ; Rico-García, José María | John Wiley & SONS INC | 2010-04A diffractive optical element having equal-width concentric square rings is analyzed in this article. This constant width makes possible its realization using spatial light modulators or square pixels phase screens. It allows a simple analytical[...]texto impreso
Alda, Javier ; Rico García, José María ; Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel | Elsevier | 2009-06-14We analyze the optical behavior of square Fresnel zones plates. A theoretical analysis and numerical simulations based on the Rayleigh-Sommerfeld approach have been developed analyzing properties such as the depth of focus and the intensity of t[...]texto impreso
Mendez, Javier ; González Contreras, Gabriel ; Cuadrado Conde, Alexander ; Alda, Javier ; González Contreras, Francisco Javier | Institution of Engineering and Technology (IET) | 2018Plasmonic nanoantennas are currently the subject of many theoretical and experimental investigations due to their unique properties and potential applications. In this work, a new type of plasmonic nanoantenna the discrete bowtie nanoantenna is [...]texto impreso
López Alonso, José Manuel ; Alda, Javier ; Rabal, Héctor ; Grumel, Eduardo ; Trivi, Marcelo | IOP Publishing Group | 2015-03-01In this work we use principal components analysis to characterize dynamic speckle patterns. This analysis quantitatively identifies different dynamics that could be associated to physical phenomena occurring in the sample. We also found the cont[...]texto impreso
Elshorbagy, Mahmoud Hamdy Mohamed ; Cuadrado Conde, Alexander ; Romero Martínez, Beatriz ; Alda, Javier | Nature Publishing Group | 2020-05-08Perovskite solar cells are currently considered a promising technology for solar energy harvesting. Their capability to deliver an electrical signal when illuminated can sense changes in environmental parameters. We have numerically analyzed the[...]texto impreso
The far-field scattered in the infrared by an arrangement of metallic structures deposited on a dielectric wafer is estimated in this paper. The scattering is modelled by using operators that describe the far field obtained under the regime appl[...]texto impreso
Rueda Ordax, Gloria María ; Alda, Javier ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2010This paper shows how corneal topographic data can be used to determine the value of the longitudinal spherical aberration. We have obtained the corneal profiles and the values of the longitudinal spherical aberration for the rays propagating wit[...]texto impreso
Rico-García, José María ; López-Alonso, José Manuel ; Lail, Brian ; Boreman, Glenn ; Alda, Javier | SPIE | 2004-12-06Fresnel Zone Plate Lenses (FZPLs) have been successfully coupled to infrared (IR) antennas producing a responsivity enhancement of about two orders of magnitude. However, their lateral extension may compromise their applicability in focal-plane-[...]texto impreso
Ultrathin amorphous silicon hydrogenated (aSi-H) solar cells grown on a one-dimensional (1-D) dielectric subwavelength gratings improve the short circuit current by a factor of more than 51% when compared with conventional, flat ultrathin aSi-H [...]texto impreso
A few years ago, some of the authors of the paper demonstrated the resonance of optical antennas in the visible frequencies. The results of that paper were obtained using experimental techniques that were primarily developed for the measurement [...]texto impreso
Elshorbagy, Mahmoud Hamdy Mohamed ; Cuadrado Conde, Alexander ; Alda, Javier | OSA Publishing | 2017A metallic nanostructured array that scatters radiation toward a thin metallic layer generates surface plasmon resonances for normally incident light. The location of the minimum of the spectral reflectivity serves to detect changes in the index[...]texto impreso
Vázquez Moliní, Daniel ; González Cano, Agustín ; Díaz Herrera, Natalia ; Llombart, N. ; Alda, Javier | SPIE | 2012-10-15The history of optics is a very rich field of science and it is possible to find many simple and significant examples of the application and success of the experimental method and therefore is a very good tool to transmit to the student the way [...]texto impreso
Vázquez Moliní, Daniel ; Álvarez Fernández Balbuena, Antonio ; García Botella, Ángel ; Alda, Javier | SPIE | 2015-08-25In this contribution the line flow method is applied to an optimized secondary optics in a photovoltaic concentration system where the primary optics is already defined and characterized. This method is a particular application of photic field t[...]texto impreso
Álvarez Fernández-Balbuena, Antonio ; Vázquez Moliní, Daniel ; Alda, Javier ; Bernabeu Martínez, Eusebio | Spie-Soc Photo-Optical Instrumentation Engineers | 2006-07The flux transfer efficiency of an optical array with spatial integration has been improved by adding a new element at the input surface. The optical characteristics of the input surfaces of the individual units do not affect the spatial integra[...]texto impreso
Gómez Pedrero, José Antonio ; Alda, Javier ; Aradian, Ashod ; Delair, Stephanie ; Flexer, Victoria ; Veltri, Alessandrofac | Facultad de Optica y Optometría | 2015Tabla de contenido: Introducción por José A. Gómez Pedrero...3 Ciencia y Deporte por Luis M. Sánchez Brea ....6 El lugar de Chema por Javier Alda ....8 Memories of José María in Bordeaux (Recuerdos de José María en Burdeos) por Ashod Aradian ...[...]texto impreso
Mennemanteouil, Marie-Maxime ; Colas-des-Francs, Gérard ; Buret, Mickaël ; Dasgupta, Arindam ; Cuadrado, Alexander ; Alda, Javier ; Bouhelier, Alexandre | Gruyter | 2018-10-11Electrically biased metal nanostructures are at the core of innovative multifunctional integrated devices that control the flow of electrons and photons at the nanoscale. They are based on plasmonic structures that create strongly confined field[...]texto impreso
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Silva López, Manuel ; Rico-García, José María ; Alda, Javier | The Optical Society Of America | 2012-10-08An experimental setup to measure the three-dimensional phase-intensity distribution of an infrared laser beam in the focal region has been presented. It is based on the knife-edge method to perform a tomographic reconstruction and on a transport[...]texto impreso
Alda, Javier ; Rico-García, José María ; López-Alonso, José Manuel ; Boreman, Glenn | Egyptian Society of Solid State Science & Applications | 2005Antenna-coupled optical detectors, also named as optical antennas, are being developed as detection devices with micro- and nano-scale features for their use in the millimetre, infrared, and visible spectral range. They are optical components th[...]texto impreso
Bueno, Juan ; López Camacho, Elena ; Silva-López, Manuel ; Rico-García, José María ; Llombart, N ; Alda, Javier ; Costa-Krämer, José Luis | Elsevier | 2013-11Silicon microlenses are a very important tool for coupling terahertz (THz) radiation into antennas and detectors in integrated circuits. They can be used in a large array structures at this frequency range reducing considerably the crosstalk bet[...]texto impreso
Monochromatic aberrations in resonant optical elements applied to a focusing multilevel reflectarray
The monochromatic aberrations produced by the phase distribution reflected by resonant sub-wavelength metallic structures are studied both analytically and numerically. Even for normal incidence, the angular dependence of the re-radiated wavefro[...]texto impreso
This work reports on a computational analysis of how a modified perovskite cell can work as a refractometric sensor by generating surface plasmon resonances at its front surface. Metal-dielectric interfaces are necessary to excite plasmonic reso[...]texto impreso
Finite-difference time-domain (FDTD) algorithms are affected by numerical artifacts and noise. In order to obtain better results we propose the use of the principal component analysis based on multivariate statistical techniques. It allows a str[...]texto impreso
Vázquez Moliní, Daniel ; Muñoz de Luna Clemente, Javier ; Álvarez Fernández-Balbuena, Antonio ; García Botella, Ángel ; Belloni, Paola ; Alda, Javier | SPIE | 2012-10-15One of the key challenges in the teaching of Optics is that students need to know not only the math of the optical design, but also, and more important, to grasp and understand the optics in a three-dimensional space. Having a clear image of the[...]texto impreso
Rueda Ordax, Gloria María ; Alda, Javier ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 1999The maximum or minimum character of the optical path is analyzed when the angle of incidence on a dielectric sphere is near the limit angle and the object point is close to the Weierstrass object point.texto impreso
Cuadrado Conde, Alexander ; Toudert, Johan Aristippe Michael ; García Cámara, Braulio ; Vergaz Benito, Ricardo ; González, Francisco Javier ; Alda, Javier ; Serna Galán, Rosalía | IEEE (Institute of Electrical and Electronics Engineers) | 2016-12-13Plasmonic nanostructures can be described by equivalent impedance, allowing the analysis of their properties and performance by an RLC circuit equivalent model. In this letter, the equivalent impedance has been obtained from a power budget calcu[...]texto impreso
Alda, Javier ; Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Rico-García, José María ; González, Francisco Javier | IEEE | 2010Polygonal Fresnel zone plates can be configured in a variety of forms depending on the number of sides of the polygon and the number of phase steps used. This contribution deals with some specific polygonal designs that tessellate the plane: tri[...]texto impreso
Rico-García, José María ; Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Alda, Javier | SPIE | 2009-06-17Polygonal Fresnel zone plates with a low number of sides have deserved attention in micro and nanoptics, because they can be straightforwardly integrated in photonic devices, and, at the same time, they represent a balance between the high-focus[...]texto impreso
Elshorbagy, Mahmoud Hamdy Mohamed ; Cuadrado Conde, Alexander ; Gómez Pedrero, José Antonio ; Alda, Javier | MDPI | 2020-02-11The bolometric effect allows us to electrically monitor spectral characteristics of plasmonic sensors; it provides a lower cost and simpler sample characterization compared with angular and spectral signal retrieval techniques. In our device, a [...]texto impreso
Elshorbagy, Mahmoud Hamdy Mohamed ; Cuadrado Conde, Alexander ; González Contreras, Gabriel ; González Contreras, Francisco Javier ; Alda, Javier | IEEE | 2019-03-27In this paper, we present a plasmonic refractometric sensor that works under normal incidence; allowing its integration on a fiber tip. The sensor's material and geometry exploit the large scattering cross-section given by high-contrast of the i[...]texto impreso
Moreno, Camilo ; Alda, Javier ; Kinzel, Edward ; Boreman, Glenn | The Optical Society Of America | 2017-02When considering the pseudo-heterodyne mode for detection of the modulus and phase of the near field from scattering scanning near-field optical microscopy (s-SNOM) measurements, processing only the modulus of the signal may produce an undesired[...]texto impreso
We demonstrate the capabilities of principal component analysis (PCA) for studying the results of finite-difference time-domain (FDTD) algorithms in simulating photonic crystal microcavities. The spatial-temporal structures provided by PCA are r[...]texto impreso
Vázquez Moliní, Daniel ; Alda, Javier ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1999-03-01A planar optical array is presented that provides a selective concentration of the light incident upon the system onto a given area. Several alternative designs are analyzed and explained geometrically. The photometric calculation is presented f[...]texto impreso
Elshorbagy, Mahmoud Hamdy Mohamed ; Cuadrado Conde, Alexander ; Alda, Javier | Springer Science+Business Media | 2020-01-03We present a refractometric sensor realized as a stack of metallic gratings with subwavelength features and embedded within a low-index dielectric medium. Light is strongly confined through funneling mechanisms and excites resonances that sense [...]texto impreso
Cuadrado, Alexander ; Briones, Edgar ; González, Francisco Javier ; Alda, Javier | Optical Society of America (OSA) | 2014-05-30Optical nanoantennas made of two metals are proposed to produce a Seebeck voltage proportional to the Stokes parameters of a light beam. The analysis is made using simulations in the electromagnetic and thermal domains. Each Stokes parameter is [...]