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Autor Alda, Javier |
Documentos disponibles escritos por este autor (63)
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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 [...]![]()
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López Alonso, José Manuel ; Rico-García, José María ; Alda, Javier | The Egyptian Society of Solid State Science | 2006Finite-Differences Time-Domain (FDTD) algorithms are well established tools of computational electromagnetism. Because of their practical implementation as computer codes, they are affected by many numerical artefact and noise. In order to obtai[...]![]()
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López Alonso, José Manuel ; Alda, Javier ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2002-01-10Principal-component decomposition is applied to the analysis of noise for infrared images. It provides a set of eigenimages, the principal components, that represents spatial patterns associated with different types of noise. We provide a method[...]![]()
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Cuadrado, Alexander ; Silva-López, Manuel ; López-Alonso, José Manuel ; Martínez Antón, Juan Carlos ; Ezquerro Rodríguez, José Miguel ; González, Francisco Javier ; Alda, Javier | SPIE | 2015-08-28One of the main technical difficulties in the fabrication of optical antennas working as light detectors is the proper design and manufacture of auxiliary elements as load lines and signal extraction structures. These elements need to be quite s[...]![]()
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Mora Ventura, Brhayllan ; Díaz de León, Ramón ; García Torales, Guillermo ; Flores, Jorge L. ; Alda, Javier ; González, Francisco J. | SPIE | 2016-05-02Seebeck nanoantennas, which are based on the thermoelectric effect, have been proposed for electromagnetic energy harvesting and infrared detection. The responsivity and frequency dependence of three types of Seebeck nanoantennas is obtained by [...]![]()
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Briones, Edgar ; Briones, Joel ; Martínez Antón, Juan Carlos ; Cuadrado, Alexander ; McMurtry, Stefan ; Hehn, Michel ; Montaigne, François ; Alda, Javier ; González, Francisco Javier | 2014-12-08Abstract— In this letter we introduce a new type of infrared sensor, based on thermocouple nanoantennas, which enables the energy detection and gathering in the mid-infrared region. The proposed detector combines the Seebeck effect, as a transdu[...]![]()
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Briones, Edgar ; Briones, Joel ; Cuadrado, Alexander ; Martínez Antón, Juan Carlos ; McMurtry, Stefan ; Hehn, Michel ; Montaigne, François ; Alda, Javier ; González, Francisco Javier | American Institut of Physics | 2014We propose a mid-infrared device based on thermocouple optical antennas for light sensing and energy harvesting applications. We numerically demonstrate that antennas are able to generate low-power dc signals by beneficing of the thermoelectric [...]![]()
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Briones, Edgar ; Cuadrado, Alexander ; Briones, Joel ; Díaz de León, Ramón ; Martínez-Antón, Juan Carlos ; McMurtry, Stefan ; Hehn, Michel ; Montaigne, François ; Alda, Javier ; González, Francisco Javier | Optical Society of America (OSA) | 2014-09-17Arrays of metallic thermocouples in the shape of spiral nanoantennas are proposed as infrared detectors, which use the thermoelectric properties of the metallic interfaces to generate electrical DC signals. The responsivity of these types of ant[...]![]()
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Alda, Javier ; López Alonso, José Manuel ; Rico García, José María ; Zoido Chamorro, Jesús Manuel ; Boreman, Glenn | SPIE | 2004-04-15The miniaturization of light detectors in the visible and infrared has produced devices with micrometric and sub-micrometric spatial features. Some of these spatial features are closely linked with the physical mechanism of detection. An example[...]![]()
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Cuadrado Conde, Alexander ; López Alonso, José Manuel ; González, Francisco Javier ; Alda, Javier | Springer Science+Business Media | 2017When optical antennas are used as light detectors, temperature changes their spectral response. Using this relation, we determine the spectrum of a light beam from an optical antenna’s signal. A numerical evaluation of the temperature-spectral r[...]![]()
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Cuadrado, Alexander ; González, Francisco Javier ; Alda, Javier | 2014-03-24Directional steerability can be obtained for an array of optical antennas through selective heating of the individual elements. Heating changes electrical conductivity of the heated element, which affects the phase of the generated currents. The[...]