Información del autor
Autor Calvo Padilla, María Luisa |
Documentos disponibles escritos por este autor (133)
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Martínez Matos, Óscar ; Cheben, Pavel ; Schmid, Jens H. ; Bogdanov, Alexei L. ; Calvo Padilla, María Luisa ; Delâge, André ; Densmore, Adam ; Janz, Siegfried ; Lamontagne, Boris ; Lapointe, Jean ; Post, Edith ; Powell, Ian ; Rodrigo Martín-Romo, José Augusto ; Waldron, Phillip ; Xu, Dan-Xia | IEEE | 2006We present several new concepts to extend the capabilities of arrayed waveguide grating spectrometers. Strong lateral mode confinement wavegaide structure in the focal plane is used to increase resolution, a Michelson-type AWG spectrometer can i[...]texto impreso
The authors present a mathematically exact formulation of the initial field striking the aperture of an absorbing optical waveguide, via an integral equation description. An analysis of the residual scattering by the waveguide is presented. Beca[...]texto impreso
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Weigand Talavera, Rosa María ; Calvo Padilla, María Luisa ; Gonzalo Fonrodona, Isabel ; Villafranca Velasco, Aitor | 2017-01Se generaran topografías FDTD en sistemas fotónicos para ejemplificación en clase por parte del profesor, realización de trabajos en grupo, realización de prácticas de laboratorio, autoaprendizaje del alumno y Trabajos Fin de Grado y Máster.texto impreso
Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | Elsevier Science BV | 2007-10-15Gyrator transform is a new tool for manipulation of two-dimensional signals such as images or laser beam profiles. Here we demonstrate various applications of the gyrator transform for image processing. Several aspects such as noise reduction, f[...]texto impreso
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Carreras Béjar, Carmen ; Chevalier del Río, Margarita ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 1984In this paper, we present a theoretical model for the transmission function of a biological cell. Three different cases have been considered: a) Real transmission function, b) Pure phase Object, c) Mixed case where both, real and complex terms a[...]texto impreso
Varela Vargas, Alberto J. ; Calvo Padilla, María Luisa | Spie-Soc Photo-Optical Instrumentation Engineers | 1995-04We present a comparative study between two experimental methods to determine the modulation transfer function (MTF) of a hololens system. The two hololenses were previously recorded and tested for filtering pseudocolor. In the first method we us[...]texto impreso
Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Janz, Siegfried ; Rodrigo Martín-Romo, José Augusto ; Xu, Dan-Xia ; Delâge, André | IEEE - Inst. Electrical Electronics Engineers Inc. | 2006-03The authors propose a new wavelength-dispersive principle based on waveguide group-index modification and apply this principle in a new type of arrayed waveguide dispersive element based on modified group index. The element is composed by an arr[...]texto impreso
Villafranca Velasco, Aitor ; Bock, Przemek J. ; Cheben, Pavel ; Calvo Padilla, María Luisa ; Schmid, Jens H. ; Lapointe, Jean ; Xu, Dan-Xia ; Janz, Siegfried ; Delâge, André | The Institution of Engineering and Technology (IET) | 2012-06-07The fabrication and experimental characterisation of a two-stage bandpass filter based on curved waveguide sidewall gratings is reported for the silicon-on-insulator platform. At each cascaded filtering stage, the spectral components of the inpu[...]texto impreso
Martínez Matos, Óscar ; Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Cámara, Alejandro ; Cheben, Pavel ; Calvo Padilla, María Luisa | The Optical Society Of America | 2011-03-28In this work, we propose a robust and versatile approach for the characterization of the complex field amplitude of holographically generated coherent-scalar paraxial beams. For this purpose we apply an iterative algorithm that allows recovering[...]texto impreso
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Guibelalde del Castillo, Eduardo ; Calvo Padilla, María Luisa | Spie-Soc Photo-Optical Instrumentation Engineers | 1987-06A new integral equation is presented and solved by a matrix method based on iterative procedures to obtain information about the transmission and reflection of light (scalar field) in inhomogeneous media. The method, which may be applied to a wi[...]texto impreso
The physical possibility of neutron fibres, proposed in a previous paper, is reviewed briefly. Further possibilities and results are reported specifically about : (a) magnetized fibres, (b) propagation modes in homogeneous circular fibres (upper[...]texto impreso
In this work we present a general formulation of the corrections to the Raman-Nath approximation for the diffracted field by a volume hologram, based on integral equations. An approximate analytic expression is given for the first correction. Nu[...]texto impreso
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Guibelalde del Castillo, Eduardo ; Calvo Padilla, María Luisa | Kluwer Academic Publishers | 1986-05A coupled-wave analysis is given for a mixed hologram grating. The effect of spatial dephasing between the absorption and phase grating which was previously presented in transmission gratings is now developed for reflection ones. The effect is p[...]texto impreso
Fernández Álvarez-Estrada, Ramón ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 1983A general integral equation for the total scattered magnetic field is presented. Thus,the coupling phenomena between N identical dielectric waveguides can be interpreted as a multiple scattering process. The application to the case of two identi[...]texto impreso
Bock, Przemek J. ; Cheben, Pavel ; Schmid, Jens H. ; Villafranca Velasco, Aitor ; Delâge, André ; Janz, Siegfried ; Xu, Dan-Xia ; Lapointe, Jean ; Hall, Trevor J. ; Calvo Padilla, María Luisa | The Optical Society Of America | 2012-08-27We experimentally demonstrate a new type of waveguide multiplexer device designed for silicon photonics, with a crosstalk level as low as -35 dB and an operational wavelength range of 300 nm. A compact device footprint of only 100 x 160 µm2 offe[...]texto impreso
Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa ; Davis, Jeffrey A. | Taylor and Francis Ltd. | 2005-12-15The paper reports studies, both experimental and using numerical simulation, of the Fresnel diffraction by recently introduced fractal zone plates associated with triadic and quintic Cantor sets. The evolution of the intensity patterns at planes[...]texto impreso
The interaction and diffraction of a classical electromagnetic wave by a thin slab characterised by a periodic dielectric permeability is studied rigorously, thereby completing previously existing studies. New integral equations for the inductio[...]texto impreso
Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 2003The Fresnel and Fraunhofer diffraction on the regular structures generated by the multiplicative iterative procedures is considered. It is proved that the iterative procedure of field construction is preserved during Fresnel diffraction, meanwhi[...]texto impreso
Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Rodrigo Martín-Romo, José Augusto ; Cheben, Pavel ; Monte Muñoz de la Peña, Francisco del | American Institute of Physics | 2007-10-01We report results on the temporal evolution of the diffraction efficiency of volume holographic gratings recorded in a photopolymer glass incorporating Zr-based high refractive index species (HRIS) at molecular level. We record high spatial freq[...]texto impreso
Sanz, Inmaculada ; Calvo Padilla, María Luisa ; Chevalier del Río, Margarita | SPIE--The International Society for Optical Engineering | 1998The presence of degraded or soft edges on a scene or digital image may cause ambiguities in depth perception(1,2). This kind of edges has been analyzed by introducing a mathematical model to digitally implement a large category of degraded edges[...]texto impreso
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We present a formalism based upon dynamic programming (DP), to characterize light propagation in particular GRIN (gradient index) media by analyzing ray trajectories associated with skew-type rays. We study the conditions for the formation of pe[...]texto impreso
Calvo Padilla, María Luisa ; Enoch, Jay M. jmenoch@socrates.berkeley.edu | Lippincott Williams & Wilkins | 2003-10We discuss many aspects of a reproduction of a formal painting from the XVIth century. It is a portrait of Viceroy of New Spain Luis de Velasco, El Joven or Hijo (son—see text), found at the Museum of the Pecos National Monument (near Pecos and [...]texto impreso
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Manzanares Ituarte, Ana ; Calvo Padilla, María Luisa ; Chevalier dl Río, Margarita ; Lakshminarayanan, Vasudevan | Elsevier Science BV | 1998-12We discuss a formalism to characterize degraded edge images formed in a diffraction limited system (with circular pupil of unit radius) under conditions of incoherent illumination. We introduce a novel definition of degraded edges and consider t[...]texto impreso
Fernández Álvarez-Estrada, Ramón ; Calvo Padilla, María Luisa | American Institute of Physics | 1980The scattering of electromagnetic waves by an infinite dielectric cylinder with variable dielectric permeability presents, in general, certain mathematical difficulties regarding the construction of rigorous solutions. We give a new divergencele[...]texto impreso
Kundikova, Nataliya D. ; Ryzhkova, A. V. ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa ; Rodrigo Martín-Romo, José Augusto | Maik Nauka, Interperiodica, Springer-Verlag | 2008-05The effect of the Gaussian beam width on the focusing properties of the chainlike Gaussian beam formed upon diffraction of laser radiation on a binary amplitude mask is studied. It is found that a decrease in the Gaussian beam width increases th[...]texto impreso
Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Monte Muñoz de la Peña, Francisco del ; Rodrigo Martín-Romo, José Augusto | American Physical Society | 2006-08-25We report observations of periodic oscillatory behavior of the angular selectivity, near the Bragg angle, in volume holographic gratings recorded in a new photopolymerizable glass with high refractive index modulation. We have detected the prese[...]texto impreso
Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | Optical Society of America | 2007-10The gyrator transform (GT) promises to be a useful tool in image processing, holography, beam characterization, mode transformation, and quantum information. We introduce what we believe to be the first flexible optical experimental setup that p[...]texto impreso
The multiple scattering of classical electromagnetic waves byN fixed dielectric obstacles is studied by using a new Green’s function introduced in a previous paper. The use of the new Green’s function leads us to show that the kernels of the bas[...]texto impreso
Martínez Matos, Óscar ; Hernández Garay, María de la Paz ; Izquierdo, J. G. ; Vaveliuk, Pablo ; Bañares Morcillo, Luis ; Calvo Padilla, María Luisa | American Institute of Physics | 2014-07-28A procedure to characterize the induced damage and the incubation effects in volume transmission gratings under femtosecond laser pulse train illumination is presented. It was also developed a formalism that explains the damage processes. Our pr[...]texto impreso
Martínez Matos, Óscar ; Hernández Garay, María de la Paz ; González Izquierdo, Jesús ; Calvo Padilla, María Luisa ; Vaveliuk, Pablo ; Cheben, Pavel ; Bañares Morcillo, Luis | Optical Society of America | 2011-01-17The majority of the applications of ultrashort laser pulses require a control of its spectral bandwidth. In this paper we show the capability of volume phase holographic gratings recorded in photopolymerizable glasses for spectral pulse reshapin[...]texto impreso
Guibelalde del Castillo, Eduardo ; Calvo Padilla, María Luisa | The Optical Society Of America | 1982We present a theoretical model for the filter function of a holographic grating when the absorption coefficient of the photomaterial is nonnegligable. In this case there is also modulation in the conductivity, which leads to a cosinusoidal funct[...]texto impreso
Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | American Institute of Physics (AIP) | 2006In this work we propose a flexible symmetric configuration for the separable fractional FT composed by three generalized lenses. The distances between the lenses are fixed. The fractional angles are acieved by means of lens rotations.texto impreso
Molina de la Peña, Ignacio ; Calvo Padilla, María Luisa ; Álvarez Estrada, Ramón F. | Taylor & Francis Ltd | 2019-06-22We studied the propagation of slow neutrons and their waveguiding properties in certain suitable thin films where Ti and Si play a key role, having in mind their possible use in Boron Neutron Capture Therapy (BNCT) of small tumors. In PBSi2017 w[...]texto impreso
Calvo Padilla, María Luisa ; Alieva, Tatiana Krasheninnikova ; Bastiaans, Martin J. ; Rodrigo Martín-Romo, José Augusto ; Rodríguez Merlo, D. | SPIE--The International Society for Optical Engineering | 2004We present a short overview on the application of fractional cyclic and linear canonical transformations to optical signal processing and dedicate some of the discussions to the particular features found in the fractional Fourier transform domain.texto impreso
Davis, Jeffrey A. ; Ramirez, Laura ; Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | Alan E. Willner, University of Southern California | 2004-06-15We report the first experimental results, to our knowledge, with fractal zone plates implemented in a liquid-crystal display. Our results largely agree with theory for the axial irradiance distribution of these lenses. The dependence of the shap[...]texto impreso
Davis, Jeffrey A. ; Sigarlaki, Sean Paul ; Craven, Julia M. ; Calvo Padilla, María Luisa | The Optical Society Of America | 2006-02-20We report on a Fourier series approach that predicts the focal points and intensities produced by fractal zone plate lenses. This approach allows us to separate the effects of the fractal order from those of the lens aperture. We implement these[...]texto impreso
Bastiaans, Martin J. ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | Hindawi Publishing Corporation | 2005-07-01We review the progress achieved in optical information processing during the last decade by applying fractional linear integral transforms. The fractional Fourier transform and its applications for phase retrieval, beam characterization, space-v[...]texto impreso
In this study the general algorithm for the fractionalization of the linear cyclic integral transforms is established. It is shown that there are an infinite number of continuous fractional transforms related to a given cyclic integral transform[...]texto impreso
Rodrigo Martín-Romo, José Augusto ; Rodríguez Merlo, Daniel ; Calvo Padilla, María Luisa ; Alieva, Tatiana Krasheninnikova | Maik Nauka, Interperiodica, Springer-Verlag | 2003-07Experimental results are presented for light diffraction under the Fresnel regime by two types of fractal gratings: triadic Cantor bars and Vicsek fractals. It is shown that the evolution of the diffraction patterns in the Fresnel regions reveal[...]texto impreso
Rodrigo Martín-Romo, José Augusto ; Cheben, Pavel ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa ; Scott, Alan ; Solheim, Brian ; Xu, Dan-Xia ; Delâge, André | The Optical Society Of America | 2007-12-10We present an analysis of Fourier-transform arrayed waveguide gratings in the Fresnel diffraction regime. We report a distinct spatial modulation of the interference pattern referred to as the Moire-Talbot effect. The effect and its influence in[...]texto impreso
Calvo Padilla, María Luisa ; Molina de la Peña, Ignacio ; Álvarez Estrada, Ramón F. | Spie-Int Soc Optical Engineering | 2019Neutron optics is the branch of quantum physics devoted to the study of the optical properties of slow neutrons and their behavior as wave-particles. Slow neutrons beams (with typical energy the order of 0.025 eV, known as thermal neutrons, and [...]texto impreso
Lakshminarayanan, Vasudevan ; Calvo Padilla, María Luisa | Spie-Soc Photo-Optical Instrumentation Engineers | 1991-10A systematic procedure for calculating the general transfer function of a cascaded linear optical system working under the Fresnel regime is presented. The validity of neglecting the quadratic phase factors is also discussed. For the case of inh[...]texto impreso
Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | The International Society for Optical Engineering (SPIE) | 2006Wide application of the laser beams in science, technology and biomedicine demands the generation of the beams with desirable structure. In particular for optical trapping the beams with high transversal gradient of intensity distribution or dou[...]