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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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-[...]![]()
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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 [...]![]()
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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 [...]