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Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Salgado Remacha, Francisco Javier ; Morlanes Calvo, Tomás ; Jiménez Castillo, Isidoro ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2010-06-10We present a collimation technique based on a double grating system to locate with high accuracy an emitter in the focal plane of a lens. Talbot self-images are projected onto the second grating producing moiré interferences. By means of two pho[...]texto impreso
Salgado Remacha, Francisco Javier | Universidad Complutense de Madrid, Servicio de Publicaciones | 2011-07-14Laser ablation micromachining represents a reliable fabrication method for diffractive optics with moderate costs. However, the process of laser ablation is far from a “clean process”. In fact, during the interaction of focalized and high-energe[...]texto impreso
Alda, Javier ; Sánchez Brea, Luis Miguel ; Salgado Remacha, Francisco Javier ; Rico-García, José María | John Wiley & SONS INC | 2010-04A diffractive optical element having equal-width concentric square rings is analyzed in this article. This constant width makes possible its realization using spatial light modulators or square pixels phase screens. It allows a simple analytical[...]texto impreso
Alda, Javier ; Rico García, José María ; Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel | Elsevier | 2009-06-14We analyze the optical behavior of square Fresnel zones plates. A theoretical analysis and numerical simulations based on the Rayleigh-Sommerfeld approach have been developed analyzing properties such as the depth of focus and the intensity of t[...]texto impreso
Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | European Optical Soc | 2011We analyze the effect of the fill factor of binary diffraction gratings on the near field propagation. We show that the location of the best-visibility planes changes with the configuration parameters of the grating, that is, the amplitude and p[...]texto impreso
Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | IEEE - Inst. Electrical Electronics Engineers Inc. | 2011-03-15Micro-optical devices embedded in transparent materials are usually manufactured focusing a pulsed laser in bulk fused silica. Under this condition, pulsewidth becomes the most important parameter that rules the size of the inscriptions. Ultrafa[...]texto impreso
Alda, Javier ; Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Rico-García, José María ; González, Francisco Javier | IEEE | 2010Polygonal Fresnel zone plates can be configured in a variety of forms depending on the number of sides of the polygon and the number of phase steps used. This contribution deals with some specific polygonal designs that tessellate the plane: tri[...]texto impreso
Rico-García, José María ; Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Alda, Javier | SPIE | 2009-06-17Polygonal Fresnel zone plates with a low number of sides have deserved attention in micro and nanoptics, because they can be straightforwardly integrated in photonic devices, and, at the same time, they represent a balance between the high-focus[...]texto impreso
Bernabeu Martínez, Eusebio ; Salgado Remacha, Francisco Javier ; Sánchez Martín, José Antonio | Elsevier Sci. Ltd. | 2014-04We present in this work a study of the diffraction of a focused Gaussian beam by a microrefractive cylinder, and the dependence of the far field diffracted pattern with the location of the beam focal plane, relative to the center of the cylinder[...]texto impreso
Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Álvarez Ríos, Francisco Javier ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2010-04-01We analyze the focusing properties of Fresnel zone plates fabricated over steel tapes using laser ablation. Our intention is to implement the use of micro-optical elements when the use of conventional chrome–glass elements is not indicated. Beca[...]texto impreso
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[...]texto impreso
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[...]
