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Autor Calvo Padilla, María Luisa |
Documentos disponibles escritos por este autor (133)
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The research into new photosensitive materials with advanced performance for holographic applications is an active branch in material science and photonics, still challenging the field. We proposed a new class of volume hologram recording materi[...]![]()
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Martíenz Matos, Óscar ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa ; Cheben, Pavel | The Optical Society Of America | 2009-02-15Polarization properties of transmission volume holographic phase gratings recorded in a photopolymerizable glass modified with high refractive index species are reported. The gratings are recorded by the interference of two parallel s-polarized [...]![]()
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Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa ; Bastiaans, Martin J. | SPIE--The International Society for Optical Engineering | 2003The main properties of n-th order power filtering in the fractional Fourier domain and its relationship to the differentiation operation are considered. The. application of power filtering for solving the phase retrieval problem is proposed.![]()
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Bastiaans, Martin J. ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | IOP Publishing | 2002-09-13The main properties of the power filtering operation in the fractional Fourier domain and its relationship to the differentiation operation are considered. The application of linear power filtering for solving the phase retrieval problem from in[...]![]()
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Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | The Optical Society Of America | 2009-03-30A flexible optical system able to perform the fractional Fourier transform (FRFT) almost in real time is presented. In contrast to other FRFT setups the resulting transformation has no additional scaling and phase factors depending on the fracti[...]![]()
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Mondal, Pronab K. ; Chevalier del Río, Margarita ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 1990We define a resolution criterion for the case of two narrow line images. For doing so, we have considered the two lines as superposition of gradients of two Heaviside step-functions.![]()
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Fernández Álvarez-Estrada, Ramón ; Calvo Padilla, María Luisa ; Juncos del Egido, Purificación | Taylor and Francis, Ltd. | 1980The scattering of electromagnetic waves by dielectric cylinders and, in particular, by optical fibres is studied through integral equations. The convergence of the iterations of the integral equations is established under certain conditions. The[...]![]()
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Pedraza Velasco, María Lourdes de ; Calvo Padilla, María Luisa | The Optical Society Of America | 1993-07-20A mathematical model that describes a fiber-to-fiber holographic connector is presented. We consider both single- and double-image cases for the reconstruction of the second hologram. A comparative study of the two coupling conditions is present[...]![]()
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We study anisotropic cylindrical dielectric waveguides under the following conditions: (1) their cross section ? has arbitrary shape; (2) the dielectric permittivity tensor ? has discontinuities at the boundaries, as well as a graded spatial var[...]![]()
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Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Rodrigo Martín-Romo, José Augusto ; Monte Muñoz de la Peña, Francisco del | Maik Nauka, Interperiodica, Springer-Verlag | 2007-12The advances in the sol-gel holographic recording materials, namely in the photopolymerizable compositions and photorefractive glasses, are reviewed. A new sol-gel holographic material is also discussed that exploits diffusion of a high-refracti[...]![]()
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We present an application of the analysis of light propagation in optical waveguides using the dynamic programming technique. We have obtained results for the transit time light pulse propagated in periodically segmented waveguides. Different se[...]![]()
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Herrero-Bermello, Alaine ; Villafranca Velasco, Aitor ; Podmore, Hugh ; Cheven, Pavel ; Schmid, Jens H. ; Janz, Siegfried ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Scott, Alan ; Lee, Regina | SPIE - International Society for Optical Engineering | 2018Spatial heterodyne Fourier transform (SHFT) spectroscopy is based on simultaneous interferometric measurements implementing linearly increasing optical path differences, hence circumventing the need for mechanical components of traditional Fouri[...]![]()
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Limeres, J. ; Calvo Padilla, María Luisa ; Lakshminarayanan, Vasudevan ; Enoch, Jay M. | SPIE--The International Society for Optical Engineering | 2003We propose a new stress-sensing technique based upon measurement of light scattering produced by an array of birefringent waveguides. When external; stress is applied to the array of waveguides, their optical properties are modified via the phot[...]![]()
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Martínez Matos, Óscar ; Vaveliuk, Pablo ; Moraes, Fernando Jorge Sampaio ; Fumeron, Sebastien ; Calvo Padilla, María Luisa | Optical Society of America | 2010-06A q-plate is a stratified medium composed of a uniaxial nematic liquid crystal with an inhomogeneous orientation of the optical axis possessing a topological charge q, which looks promising as a switching device. This work reports an approach to[...]![]()
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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 | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2011In this work we analyze the optical quality, performance, and recording mechanism of holographic diffraction gratings recorded in photopolymerizable sol-gel glasses. These classes of holographic photomaterials have various compositions, one of w[...]![]()
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Cheben, Pavel ; Calvo Padilla, María Luisa ; Belenguer Dávila, Tomás ; Núñez Peral, Armonía | Elsevier Science BV | 1998-03-01A novel method of substrate mode hologram (SMH) design and fabrication is presented. The coupling between a homogeneous plane wave and an arbitrary free propagating wave is achieved via a total internally reflected (TIR) wave. The input slanted [...]![]()
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Bock, Przemek J. ; Cheben, Pavel ; Villafranca Velasco, Aitor ; Schmid, Jens H. ; Delâge, André ; Florja?czyk, Miros?aw ; Lapointe, Jean ; Xu, Dan-Xia ; Vachon, Martin ; Janz, Siegfried ; Calvo Padilla, María Luisa | Wiley-V C H Verlag Gmbh | 2013-11A planar waveguide Fourier-transform spectrometer with densely arrayed Mach-Zehnder interferometers is demonstrated. Subwavelength gratings are used to produce an optical path difference without waveguide bends. The fabricated device comprises o[...]![]()
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Se presenta una revisión de las teorías de la difracción de ondas electromagnéticas por redes de volumen. En el enfoque de este trabajo se encuentran las teorías de los siguiente grupos: teorías de ondas acopladaseorías modales, teorías de dispe[...]![]()
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Moreno Soriano, Ignacio ; Yzuel, María J. ; Calvo Padilla, María Luisa | SPIE - International Society for Optical Engineering | 2018In this work, we review the main activities related to the International Day of Light (IDL) in Spain. We describe the actions of the Spanish Committee for IDL that has been created in Spain, reactivating the Spanish Committee for the Internation[...]![]()
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In this article we report on the activities in Spain related to the celebration of the International Day of Light (IDL). The Spanish Committee for the IDL was constituted in 2017, as a continuation of the previous Committee for the International[...]![]()
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Mondal, Pronab K. ; Calvo Padilla, María Luisa ; Chevalier del Río, Margarita ; Lakshminarayanan, Vasudevan | The International Society of Optical Engineering (SPIE) | 1991Resolution criteria for resolving two line images under coherent and incoherent illumination are presented. This technique has been used to interpret psychophysical data obtained from hyperacuity paradigms.![]()
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Fernández Álvarez-Estrada, Ramón ; Calvo Padilla, María Luisa | Optical Society of America | 1987-04A three-dimensional analysis of bending losses in dielectric optical waveguides is presented. It constitutes a nontrivial generalization of previous two- and three-dimensional studies by other authors. Our analysis is based on homogeneous integr[...]![]()
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Cámara, Alejandro ; Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | The Electromagnetics Academy | 2010The numerical demonstration of the phase-space tomographic reconstruction method of non-separable beams is presented in this contribution. The Wigner distribution of a Laguerre-Gaussian beam is recovered from numerically simulated intensity meas[...]![]()
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We introduce a coupling model to describe the geometry conversion in various wave fronts diffracted by a holocoupler recorded with two different Gaussian beams. We conjecture the possibilities for using the proposed device as a beam corrector.![]()
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Villafranca Velasco, Aitor ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Ortega Moñux, Alejandro ; Schmid, Jens H. ; Alonso Ramos, Carlos ; Molina Fernández, Íñigo ; Lapointe, Jean ; Vachon, Martin ; Janz, Siegfried ; Xu, Dan-Xia | IEEE | 2012We demonstrate an ultracompact polarization mode converter based on a silicon-on-insulator waveguide with two longitudinal subwavelength trenches. An extinction ratio of 16 dB at 1.5 ?m is achieved for a device length of 10 ?m.![]()
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Villafranca Velasco, Aitor ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Ortega Moñux, Alejandro ; Alonso Ramos, Carlos Alberto ; Molina Fernández, Íñigo ; Lapointe, Jean ; Vachon, Martin ; Janz, Siegfried ; Xu, Dan-Xia | The Optical Society Of America | 2012-02-01The design and fabrication of an ultracompact silicon-on-insulator polarization converter is reported. The polarization conversion with an extinction ratio of 16 dB is achieved for a conversion length of only 10 mu m. Polarization rotation is ac[...]![]()
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Monte Muñoz de la Peña, Francisco del ; Martínez Matos, Óscar ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa ; Cheben, Pavel | Wiley-V C H Verlag Gmbh | 2006-08-04Improved performance of volume holographic sol-gel materials-refractive index modulations in the 10^2 range, diffraction efficiencies near 100 %, and low levels of noise scattering-are reported that arise from the incorporation of Zr-based high [...]![]()
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The theoretical model for an off-Bragg on-axis conversion between a Gaussian beam with cylindrical phase function and a plane wave by a volume aperiodic nonplanar inhomogeneous holographic grating is presented. A two-wave first-order coupled-wav[...]![]()
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We present a coupled-wave-analysis-based treatment for a wave-front conversion problem between a Gaussian beam with a cylindrical phase and a plane wave for a two-dimensional on-axis geometry. A coupled-wave approach to the multiple-scattering p[...]![]()
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Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Cristóbal Pérez, Gabriel ; Calvo Padilla, María Luisa | The Optical Society Of America | 2011-09-12We present a fast and robust non-interferomentric wavefield retrieval approach suitable for imaging of both amplitude and phase distributions of scalar coherent beams. It is based on the diversity of the intensity measurements obtained under con[...]![]()
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Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Delâge, André ; Janz, Siegfried ; Xu, Dan-Xia | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2004We propose a modified arrayed waveguide grating (AWG) demultiplexer formed by an array of parallel ridge waveguides of equal length fabricated in silicon-on-insulator (SOI). Each waveguide contains two sections with different widths. The lenghts[...]