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Autor Torcal Milla, Francisco José |
Documentos disponibles escritos por este autor (28)
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Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2013We obtain a general analytical formulation for determining the near field produced by N diffraction gratings disposed in stack using a scalar approximation. Parameters of the gratings such as type-amplitude/phase-, fill factors, periods and rela[...]![]()
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Cuadrado Conde, Alexander ; Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio | OSA Publishing | 2019-05-01We present in this work a numerical model for characterizing the scattering properties of the human lens. After analyzing the scattering properties of two main scattering particles actually described in the literature through FEM (finite element[...]![]()
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Cuadrado, Alexander ; Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Quiroga, Juan Antonio ; Gómez Pedrero, José Antonio | Optical Society of America | 2019-05-01We present in this work a numerical model for characterizing the scattering properties of the human lens. After analyzing the scattering properties of two main scattering particles actually described in the literature through FEM (finite element[...]![]()
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Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Hoyo Muñoz, Jesús del ; Cuadrado Conde, Alexander ; Gómez Pedrero, José Antonio | IOP Publishing, Ltd. | 2020-04-02Conventional refractive lenses concentrate the incident light at focal distance. A narrow beam waist can be achieved by increasing the lens numerical aperture, but strongly reduces the depth of focus. In this paper, we explore diffractive lenses[...]![]()
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Torcal Milla, Francisco José | Universidad Complutense de Madrid, Servicio de Publicaciones | 2009-07-09In this Thesis work we present theoretical, numerical and experimental analyses of the behavior of non-perfect diffraction gratings. We have permormed an analyses of diffraction gratings engraved on a steel tape. This kind of gratings can be fou[...]![]()
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We analyze the self-imaging process produced by a transmission grating whose strips present two different roughness levels. This kind of grating periodically modulates the transmitted light owing only to the different microtopographic properties[...]![]()
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Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Herrera Fernández, José María ; Morlanes, Tomás ; Bernabeu Martínez, Eusebio | Optical Society of America | 2014A simple collimation technique based on measuring the period of one self-image produced by a diffraction grating is proposed. Transversal displacement of the grating is not required, and then automatic single-frame processing can be performed. T[...]![]()
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Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Salgado Remacha, Francisco Javier ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2010-10-15We analyze the near field behavior of binary amplitude gratings which present a curved profile. This configuration has an important application in rotary optical encoders. This kind of encoders is used to measure the angular displacement between[...]![]()
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Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2007-10-01Metallic gratings can be found in applications such as optical metrology. Due to their fabrication process, the surface presents a certain roughness. In this work, the effect of roughness on Talbot effect has been analyzed when the grating is il[...]![]()
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Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The International Society for Optical Engineering (SPIE) | 2009Diffraction gratings are one of the most used elements in optics and even in other fields of science. They are used also like part of measurement devices in scientific and industrial applications. As it is well known, self-imaging effect appears[...]![]()
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Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2007-06-20The Talbot effect is analyzed when steel tape gratings are used. These gratings are made on a steel substrate, and, because of the manufacture process, both levels of the grating are rough with different roughness parameters. A theoretical analy[...]![]()
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Salgado Remacha, Francisco Javier ; Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Elsevier Sci. Ltd. | 2011-03Steel tape is used in optical applications due to its mechanical properties. However, roughness of steel surfaces affects to wave propagation. The effect can be observed using diffraction gratings with low periods. In such a case, self-images of[...]![]()
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Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2007-08-01We present a technique for determining the contrast of an intensity distribution in the presence of additive noise and other effects, such as undesired local amplitude or offset variations. The method is based on the variogram function. It just [...]