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Autor Calvo Padilla, María Luisa |
Documentos disponibles escritos por este autor (133)
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Martínez Matos, Óscar ; Rodrigo Martín-Romo, José Augusto ; Hernández Garay, María de la Paz ; Izquierdo González, Jesús ; Weigand Talavera, Rosa María ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Vaveliuk, Pablo ; Bañares Morcillo, Luis | The Optical Society Of America | 2010-03-01We present an approach to generate paraxial laser beams with arbitrary spatial distribution in the femtosecond time regime. The proposed technique is based upon a pair of volume phase holographic gratings working in parallel arrangement. It expl[...]![]()
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Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | The Optical Society Of America | 2007-03-05In this work we formulate the main properties of the gyrator operation which produces a rotation in the twisting (position-spatial frequency) phase planes. This transform can be easily performed in paraxial optics that underlines its possible ap[...]![]()
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This paper presents a high efficiency holographic coupler design for telecommunication purposes. It is based on the eikonal approach to diffracted field analysis and on the coupled wave analysis for gaussian beam in generalized coordinate.![]()
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Florja?czyk, Miroslaw ; Villafranca Velasco, Aitor ; Cheben, Pavel ; Calvo Padilla, María Luisa ; Bock, Przemek J. ; Delâge, André ; Schmid, Jens H. ; Lapointe, Jean ; Janz, Siegfried ; Xu, Dan-Xia ; Vachon, Martin | IEEE-Inst Electrical Electronics Engineers Inc. | 2013We report a spatial heterodyne Fourier-transform spectrometer consisting of an array of Mach-Zehnder interferometers (MZI) implemented in silicon microphotonics. Optical path differences between the MZI arms increase linearly along the array, ge[...]![]()
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Villafranca Velasco, Aitor ; Cheben, Pavel ; Bock, Przemek J. ; Schmid, Jens H. ; Delâge, André ; Lapointe, Jean ; Janz, Siegfried ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Florja?czyk, Miros?aw ; Vachon, Martin | The Optical Society Of America | 2013-03-01We report a stationary Fourier-transform spectrometer chip implemented in silicon microphotonic waveguides. The device comprises an array of 32 Mach-Zehnder interferometers (MZIs) with linearly increasing optical path delays between the MZI arms[...]![]()
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Based on a previous model describing the behavior of a holocoupler/fiber optic device, we develop a new model for a holocoupler/GRIN lens system and analyze the conditions for the coupling to hold and the requirements of the coupled signal![]()
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Pedraza Velasco, María Lourdes de ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 1989The interconnection problems in the use of optical fibers for signal transmission is a very active area of research involving several fields such as optical communication techniques and holography. Various authors have studied the efficiency of [...]![]()
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Pedraza Velasco, María Lourdes de ; Calvo Padilla, María Luisa | The Optical Society Of America | 1989-06-01A mathematical model for describing a holographic coupler–optical fiber system is considered. The object wave to be recorded in the hologram is assumed to be a polarized wave which is scattered by the optical fiber. In the reconstruction the opt[...]![]()
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Martínez Matos, Óscar ; Rodrigo Martín-Romo, José Augusto ; Vaveliuk, Pablo ; Calvo Padilla, María Luisa | Optical Society of America | 2011-02-15We propose a spectrum analyzer based on the properties of a hologram recorded with the field transmitted by a Fabry-Perot etalon. The spectral response of this holographic Fabry-Perot spectrometer (HFPS) is analytically investigated in the parax[...]![]()
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Hernández Garay, María de la Paz ; Martínez Matos, Óscar ; González Izquierdo, Jesús ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Bañares Morcillo, Luis | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2011We present the capability of the holographic gratings implemented in photopolymerizable glasses to be applied in spatial and spectral manipulation of femtosecond laser pulses. For this purpose we used volume phase holographic gratings recorded b[...]![]()
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Guibelalde del Castillo, Eduardo ; Calvo Padilla, María Luisa | Butterworth - Heinemann Ltd. | 1988-06The transition from the Raman-Nath to a Bragg regime for holographic grating diffracted fields is studied using a new integral equation and Fourier transform techniques. Analytical and numerical studies are presented and evaluated.![]()
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Calvo Padilla, María Luisa ; Alieva, Tatiana Krasheninnikova | Maik Nauka, Interperiodica, Springer-Verlag | 2003-07Image reconstruction from amplitude-only and phase-only data in the fractional Fourier domain applying the inverse fractional Fourier transform is analyzed on the examples of perfect edges of different contrasts and real-world image.![]()
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The importance of the amplitude and phase in the fractional Fourier transform (FT) domain is analyzed on the basis of the rectangular signal and the real-world image. The quality of signal restoration from only the amplitude or from only the pha[...]![]()
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The spatial impulse response of a single variable-cross-section photoreceptor has been characterized assuming the incoming radiation to be an initial field propagating under confinement conditions inside the receptor. By application of Fourier a[...]![]()
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Carreras Béjar, Carmen ; Calvo Padilla, María Luisa ; Chevalier del Río, Margarita | SPIE--The International Society for Optical Engineering. | 1985In preceding works, a theoretical model has been introduced for the transmission function of a biological cell, in which the physical effects of the three transmission functions for the cytoplasm, the nucleus and the cellular membrane have been [...]![]()
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We consider a general class of inhomogeneous dielectric slabs, where the dielectric permittivity (l) is assumed to depend on the frequency (y) at each position, through the Kramers-Krönig dispersion relation. The physical basis for this assumpti[...]![]()
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We study monomode slab and cylindrical waveguides, in which the dielectric permittivity l has both a graded spatial variation and finite discontinuities at the boundaries. New integral equations for the H-type propagation mode in the slab and fo[...]![]()
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An exact formulation of the electromagnetic field striking an optical waveguide is presented and compared with the decomposition relationship used in the literature. The expression for the critical angle is derived as a natural consequence of th[...]![]()
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We present here numerical estimates of the density and flux of energy based on physical parameters associated with the absorption properties of certain types of absorbing optical waveguides. These results are based on a theoretical formalism est[...]![]()
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Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | American Institute of Physics (AIP) | 2007We introduce the gyrator transform which produces a rotation of two-dimensional signal in phase space. Main properties of this transform are considered. The flexible optical set up for gyrator transform experimental implementation is discussed. [...]![]()
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We apply techniques of optimal-control theory, namely, the methods of dynamic programming, to the problem of light propagation in optical waveguides. This formulation is equivalent to the resolution of an eikonal equation. We illustrate this opt[...]![]()
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Calvo Padilla, María Luisa ; Enoch, Jay M. ; Lakshminarayanan, Vasudevan ; Limeres, J. | The Optical Society Of America | 2003-07We develop a computational method for calculating the spatial profile of the electromagnetic field after scattering by an array of waveguides. Our formalism is very general and includes chromatic dependence, the influence of the array arrangemen[...]![]()
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Manzanares Ituarte, Ana ; Calvo Padilla, María Luisa ; Chevalier del Río, Margarita ; Lakshminarayanan, Vasudevan | The Optical Society Of America | 1997-07-01A revised formulation of the image Light distribution of an incoherent line source proposed by Steel [Rev. Opt. 31, 334-340 (1952)] is presented. Analytical and numerical results based on this new representation are given. We explicitly show tha[...]![]()
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Since the last decades, cell phones have become increasingly popular and are nowadays ubiquitous. New generations of cell phones are now equipped with text messaging, internet, and camera features. They are now making their way into the classroo[...]![]()
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Rodrigo Martín-Romo, José Augusto ; Caravaca Aguirre, Antonio Miguel ; Alieva, Tatiana Krasheninnikova ; Cristóbal Pérez, Gabriel ; Calvo Padilla, María Luisa | The Optical Society Of America | 2011-03-14Three-dimensional microparticle movements induced by laser beams with a funnel- and tubular pod-like structure, in the neighbourhood of the focal plane of an optical trapping setup, are experimentally studied. The funnel and pod beams constructe[...]![]()
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We present a general formulation for multiple scattering of classical electromagnetic waves by volume gratings. Fujiwara's electron multiple scattering theory is modified and extended to the case of both, the transmission and the reflection geom[...]![]()
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Fernández Álvarez-Estrada, Ramón ; Calvo Padilla, María Luisa | Pergamon-Elsevier Science Ldt | 2004-11We summarize previous researches regarding neutron guides of small transverse cross-section (neutron fibres), smaller than those of the standard hollow guides and collimators employed currently. Those studies may not be widely known in the neutr[...]![]()
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For pt.I see ibid., vol.17, p.475 (1984). The possible confined propagation of slow (thermal) neutrons along cladded waveguides of small cross section (fibres) is studied, in order to improve a previously published analysis. Quite suitable possi[...]![]()
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The authors study confined propagation of slow (thermal) neutrons along (non-hollow) solid fibres made of certain elements (Ti, Mn, ...) such that amplitude for the low-energy nuclear scattering of neutrons on them be negative. Geometrical optic[...]![]()
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The confined propagation of slow neutrons along waveguides of a small cross section (fibres), discussed theoretically some time ago and demonstrated experimentally by other authors later, is analysed further. Motivated by those experiments, a th[...]![]()
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Neutron waveguides in neutron optics: Green's functions formalism with Dirichlet boundary conditions
Molina de la Peña, Ignacio ; Calvo Padilla, María Luisa ; Álvarez Estrada, Ramón F. | Taylor and Francis Ltd. | 2020-06-06In neutron optics, we analyse the propagation of slow (thermal) neutrons along a semi-infinite waveguide limited by a large repulsive potential (reminding the propagation of light along an optical fibre). We set an ideal case of a straight empty[...]![]()
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Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Rodrigo Martín-Romo, José Augusto ; Janz, Siegfried ; Xu, Dan-Xia ; Delâge, André | Elsevier Science BV | 2007-02-01We propose a new type of arrayed waveguide grating (AWG) multiplexer/demultiplexer based on modified group refractive index. This device is composed by an array of straight and parallel waveguides of equal length and each waveguide consist of tw[...]![]()
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Martínez Matos, Óscar ; Cheben, Pavel ; Calvo Padilla, María Luisa ; Rodrigo Martín-Romo, José Augusto ; Monte Muñoz de la Peña, Francisco del | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2007We report recent results obtained with volume holographic gratings recorded in a new photopolymerisable glass modified with high refractive index species at molecular level. Various not previously observed performances have been achieved for dif[...]![]()
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Rigorous approximation techniques for the scattering of a classical electromagnetic wave by fixed obstacles are studied. For that purpose, a new Green's function G^T is introduced, which is divergenceless throughout all space and, hence, less si[...]![]()
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We present a revisited study of the Thompson-Wolf experiment earlier developed in 1957 with the aim to characterize the degree of spatial coherent of a luminous source. We develop further experiments by using laser sources under various modal re[...]![]()
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Villafranca Velasco, Aitor ; Cheben, Pavel ; Florja?czyk, Miros?aw ; Schmid, Jens H. ; Bock, Przemek J. ; Lapointe, Jean ; Delâge, André ; Janz, Siegfried ; Vachon, Martin ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Civiš, Svatopluk | Optical Society of America | 2013-07-01We report a spatial heterodyne Fourier-transform spectrometer implemented with an array of optical fiber interferometers. This configuration generates a wavelength-dependent stationary interferogram from which the input spectrum is retrieved in [...]![]()
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Carreras Béjar, Carmen ; Chevalier del Río, Margarita ; Calvo Padilla, María Luisa | The Optical Society Of America | 1984In this paper we present a theoretical model for the transmission function of a biological cell. Three different cases are considered: real transmission function, pure phase object, general case, where both real and complex terms are present in [...]![]()
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Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | Optical Society of America | 2006-10On the basis of a matrix formalism, we analyze the paraxial optical systems composed by generalized lenses and fixed free-space intervals, suitable for orthosymplectic transformations in phase space. Flexible configurations to perform the attrac[...]![]()
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Cámara, Alejandro ; Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2011The application of partially coherent optical beams for imaging, free space communication, random medium analysis requires controlling its mutual intensity. This task can be done using the phase-space tomography method consisting on the reconstr[...]![]()
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Rodríguez, E. E. ; Zúñiga, H. J. ; Tepichín Rodríguez, Eduardo ; Calvo Padilla, María Luisa | American Institute of Physics (AIP) | 2008A programmable digital circuit typically consists of a microprocessor, a memory device, an input data device and an output data device, with its corresponding communication busses. These devices work following a program which is stored in the me[...]![]()
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We consider Fresnel and Fraunhofer diffraction on regular structures generated by multiplicative iterative procedures. We prove that the iterative procedure of field construction is preserved during Fresnel diffraction, while the initiator of th[...]![]()
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Pedraza Velasco, María Lourdes de ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 1990The phase profile of the wave scattered by a GRIN lens has been determined using the eikonal approximation for the scattering amplitude. This wave acts as the object wave in a holographic register to construct a GRIN holocoupler. Different geome[...]![]()
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Cámara, Alejandro ; Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | Optical Society of America | 2009-06We propose a simple approach for the phase space tomography reconstruction of the Wigner distribution of paraxial optical beams separable in Cartesian coordinates. It is based on the measurements of the antisymmetric fractional Fourier transform[...]![]()
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Cámara, Alejandro ; Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | The Optical Society Of America | 2011-07-11We show the adaptation of a multifunctional optical system consisting of two spatial light modulators for the optimal measurement of the Radon-Wigner transform of one-dimensional signals. The proposed Radon-Wigner display allows reconstructing t[...]![]()
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Permanent holographic storage has been demonstrated in a photopolymerizable organically modified silica glass. The glass was prepared by dispersing a titanocene photoinitiator and a high refractive index acrylic monomer in a porous silica matrix[...]![]()
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Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Hernández Garay, María de la Paz ; Cheben, Pavel ; Martí Panameño, Erwin José Armando | IEEE | 2009We present an overview of the main properties and the emerging implementations corresponding to a photopolymerizable glass modified with high refractive index species (HRIS) incorporated at molecular level. The study concerns to transmission and[...]![]()
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Villafranca Velasco, Aitor ; Hernández Garay, María de la Paz ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Monte Muñoz de la Peña, Francisco del | American Institute of Physics | 2011-03-01Three different holographic photomaterials belonging to the class of photopolymerizable glasses have been synthesized using sol-gel techniques, and characterized with the purpose of a comparative study. Their behavior is analyzed in terms of ach[...]![]()
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Villafranca Velasco, Aitor ; Calvo Padilla, María Luisa ; Cheben, Pavel | American Institute of Physics | 2013-06-21A novel formulation and synthesis method to overcome the thickness limitations in samples of photopolymerizable glasses with high refractive index species is presented. The reported method allows the recording of volume holographic diffraction g[...]