Search

© Optical Society of America. We are very grateful to Félix González and Diego Castillo for their help in building the prototype. We also thank Antonio Quiroga and Héctor Canabal for his assistance in the image acquisition of the synthetic image. This research was partially supported by project MAT-95-0767 of the Comisión Interministerial de Ciencia y Tecnología of Spain. This research was finished during a stay by one of the authors (J. Alda) at the Center for Research and Education in Optics and Lasers (CREOL, University of Central Florida, Orlando, Florida). This stay was supported by the Ministerio de Educación y Cultura of Spain and by a grant from CREOL., A planar optical array is presented that provides a selective concentration of the light incident upon the system onto a given area. Several alternative designs are analyzed and explained geometrically. The photometric calculation is presented for three different levels of approximation. A prototype of the proposed system is tested, showing good accordance with the theoretical predictions., Comisióm Interministerial de Ciencia y Tecnología (CICYT), España, Ministerio de Educación y Cultura, España, Center for Research and Education in Optics and Lasers (CREOL, University of Central Florida, Orlando, Florida), Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

© Elsevier Science Ltd. This work has been partially supported by the project TIC2001–1259 from the Ministerio de Ciencia y Tecnología of Spain., In this paper we analyze different alternatives in the design of optimized optical arrays having spatial integration feature in a plane arrangement. More specifically, we focus our attention in the evaluation of the number of useful individual units, and its contribution to the synthetic image characteristics. The analysis has been made by using matrix optics relations. Two examples of planar thin lens spatial integrator arrays are designed and compared., Ministerio de Ciencia y Tecnología, España, Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

In this work we use principal components analysis to characterize dynamic speckle patterns. This analysis quantitatively identifies different dynamics that could be associated to physical phenomena occurring in the sample. We also found the contribution explained by each principal component, or by a group of them. The method analyzes the paint drying process over a hidden topography. It can be used for fast screening and identification of different dynamics in biological or industrial samples by means of dynamic speckle interferometry., Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

© Optical Society of America. This research has been developed within the collaboration program between the Centro de Investigación y Desarrollo de la Armada (CIDA) and the Optics Department of the University Complutense of Madrid. The authors are deeply grateful to Benjamín M. Alvariño, director of CIDA when this research began, and to Felipe López-Merenciano, head of the Thermovision Laboratory at CIDA., Principal-component decomposition is applied to the analysis of noise for infrared images. It provides a set of eigenimages, the principal components, that represents spatial patterns associated with different types of noise. We provide a method to classify the principal components into processes that explain a given amount of the variance of the images under analysis. Each process can reconstruct the set of data, thus allowing a calculation of the weight of the given process in the total noise. The method is successfully applied to an actual set of infrared images. The extension of the method to images in the visible spectrum is possible and would provide similar results., Centro de Investigación y Desarrollo de la Armada (CIDA), España, Departamento de Óptica, Universidad Complutense de Madrid, Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

ISBN: 978-162841713-5 CODEN: PSISD Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited., Fractal antennas have been proposed to improve the bandwidth of resonant structures and optical antennas. Their multiband characteristics are of interest in radiofrequency and microwave technologies. In this contribution we link the geometry of the current paths built-in the fractal antenna with the spectral response. We have seen that the actual currents owing through the structure are not limited to the portion of the fractal that should be geometrically linked with the signal. This fact strongly depends on the design of the fractal and how the different scales are arranged within the antenna. Some ideas involving materials that could actively respond to the incoming radiation could be of help to spectrally select the response of the multiband design., Ministerio de Economia y Competitividad (MINECO), Centro Mexicano de Innovación en Energía Solar from Fondo Sectorial CONACYT-Secretaría de Energía Sustentabilidad Energética, National Laboratory program from CONACYT through the Terahertz Science and Technology National Lab (LANCYTT), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Acceso libre a la edición electrónica en la web del editor, Antenna-coupled optical detectors, also named as optical antennas, are being developed as detection devices with micro- and nano-scale features for their use in the millimetre, infrared, and visible spectral range. They are optical components that couple the electromagnetic radiation in the visible and infrared wavelengths in the same way that radioelectric antennas do at the corresponding wavelengths. Optical antennas show polarization dependence, tuneability, and rapid time of response. They also can be considered as point detectors and directionally sensitive elements. So far, these detectors have been operated in the mid-infrared with positive results in the visible. The measurement and characterization of optical antennas requires the use of an experimental set-up with nanometric resolution. On the other hand, a computational simulation of the interaction between the material structures and the incoming electromagnetic radiation is needed to explore alternative designs of practical devices. In this contribution we will present the concept of optical and infrared antennas, and some experimental results of their performance, along with the experimental set-up arranged for their characterization in the visible, Ministerio de Ciencia y Tecnología de España, Consejería de Educación de la Comunidad de Madrid, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Received 23 March 2005; received in revised form 25 October 2005; accepted 27 October 2005 Es una versión postprint., The design of plane Fresnel zone plates, and binary-staircase kinoforms, has been analyzed in this paper for a non-imaging application aimed to increase the performance of point-like detectors. They maximize the irradiance at the focal point of the diffractive element maintaining some constrains in the lateral size of the element. The design of the binary-staircase kinoform has been described as an iterative process. Some interesting results have been obtained for the values of the relative aperture number, or F/#. The practical case treated here produces elements with very low F/#. The results shows that the gain of the irradiance at the focal point increases with the focal distance of the binary-staircase kinoform, and decreases with the focal length for a plane Fresnel zone plate having a limited lateral size. The calculation of the width of the irradiance distribution makes it possible to select those solutions that best concentrate the irradiance on the focal plane. (c) 2005 Elsevier B.V. All rights reserved., Ministerio de Ciencia y Tecnología de España, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

© 2010 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited., The monochromatic aberrations produced by the phase distribution reflected by resonant sub-wavelength metallic structures are studied both analytically and numerically. Even for normal incidence, the angular dependence of the re-radiated wavefront disturbs the overall performance of the reflectarray. This effect is modelled as combination of a linear and a cubic dependence. A complete numerical simulation of a multilevel focusing reflectarray is performed using computational-electromagnetic and physical-optics-propagation methods. A modified Strehl ratio is defined to show the dependence of the focused spot behavior on aperture. The irradiance distribution is dependent on the polarization state. A small-aperture focusing reflectarray has been designed, fabricated, and tested. The irradiance distribution at the focusing plane is compared with the simulated one, showing a good agreement when residual wavefront aberrations are included., Ministerio de Ciencia e Innovacion, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Es una versión postprint., The far-field scattered in the infrared by an arrangement of metallic structures deposited on a dielectric wafer is estimated in this paper. The scattering is modelled by using operators that describe the far field obtained under the regime applicable for the Babinet's principle in its vectorial approach and the Stratton–Chu approximation. The far-field scattered by an arrangement of thin gold layers over a dielectric wafer under infrared illumination is computed. The model assumes a normally incident vectorial Gaussian beam focused over the arrangement plane. An angular spectrum decomposition of the field is done. Then, every plane wave is scattered by the whole structure: arrangement + substrate layer. The reflexions in the substrate layer and the arrangement action have been taken into account in an operator formalism. Numerical results estimating the influence of substrate thickness on the pattern are obtained., Ministerio de Ciencia y Tecnologı́a de España, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

ISBN: 978-162841738-8 CODEN: PSISD Copyright 2015. Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited., In this contribution the line flow method is applied to an optimized secondary optics in a photovoltaic concentration system where the primary optics is already defined and characterized. This method is a particular application of photic field theory. This method uses the parameterization of a given primary optics, including actual tolerances of the manufacturing process. The design of the secondary optics is constrained by the selection of primary optics and maximizes the concentration at a previously specified collection area. The geometry of the secondary element is calculated by using a virtual source, which sends light in a first concentration step. This allows us to calculate the line flow for this specific case. This concept allows designing more compact and efficient secondary optics of photovoltaic systems., Ministerio de Economia y Competitividad (MINECO), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Es una versión postprint. La versión publicada está en Open Access en la web del editor. © 2005 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited., The manufacture of a photonic crystal always produce deviations from the ideal case. In this paper we present a detailed analysis of the influence of the manufacture errors in the resulting electric field distribution of a photonic crystal microcavity. The electromagnetic field has been obtained from a FDTD algorithm. The results are studied by using the Principal Component Analysis method. This approach quantifies the influence of the error in the preservation of the spatial-temporal structure of electromagnetic modes of the ideal microcavity. The results show that the spatial structure of the excited mode is well preserved within the range of imperfection analyzed in the paper. The deviation from the ideal case has been described and quantitatively estimated., Ministerio de Ciencia yTecnología de España, Comunidad de Madrid, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

"This is the pre-peer reviewed version of the following article, which has been published in final form at [https://doi.dx.org/10.1111/j.1600-0846.2010.00461.x]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving", Background Filaggrin (FLG) gene mutations, which result in complete or incomplete loss of proFLG/FLG peptides, have been reported as an important predisposing factor for atopic dermatitis (AD) and secondary atopic phenotypes such as atopic asthma. Method The presence of the protein FLG in the skin was evaluated at birth on 12 infants using Raman spectroscopy; these 12 infants were monitored for 1 year to see whether they developed AD. Three different statistical analysis procedures, two of which involved principal component analysis (PCA), were performed on the Raman spectra in order to determine the FLG content. Results The infants who had a lower FLG content, determined using any of the three statistical analysis procedures proposed, were also the ones that clinically developed AD. Conclusion The results suggest that Raman spectroscopy and statistical analysis such as PCA could be used as an early detection procedure for FLG -related AD and as a possible quantitative marker for FLG gene mutations, Consejo Nacional de Ciencia y Tecnología (CONACyT), Fondos Mixtos San Juan Potosí (FOMIX-SLP), Ministerio de Educación y Ciencia de España, Unidad Docente de Biodiversidad, Ecología y Evolución, Fac. de Óptica y Optometría, TRUE, pub

"This is the peer reviewed version of the following article: Alda, J., Sanchez-Brea, L. M., Salgado-Remacha, F. J. and Rico-García, J. M. (2010), Diffractive optical elements with square concentric rings of equal width. Microw. Opt. Technol. Lett., 52: 930–934. doi: 10.1002/mop.25065, which has been published in final form at http://dx.doi.org/10.1002/mop.25065. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.", A 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 treatment, and the element is also simulated using the Rayleigh-Sommerfeld approach. An experimental verification of its performance has been compared with the simulated results., Ministerio de Educacion y Ciencia, Dirección General de Universidades e Investigación de la Consejería de Educación de la Comunidad de Madrid, Universidad Complutense de Madrid, European Social Fund, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

ISBN: 978-162841713-5 CODEN: PSISD Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited., The practical application of optical antennas in detection devices strongly depends on its ability to produce an acceptable signal-to-noise ratio for the given task. It is known that, due to the intrinsic problems arising from its sub-wavelength dimensions, optical antennas produce very small signals. The quality of these signals depends on the involved transduction mechanism. The contribution of different types of noise should be adapted to the transducer and to the signal extraction regime. Once noise is evaluated and measured, the specific detectivity, D*, becomes the parameter of interest when comparing the performance of antenna coupled devices with other detectors. However, this parameter involves some magnitudes that can be defined in several ways for optical antennas. In this contribution we are interested in the evaluation and comparison of D_ values for several bolometric optical antennas working in the infrared and involving two materials. At the same time, some material and geometrical parameters involved in the definition of noise and detectivity will be discussed to analyze the suitability of D_ to properly account for the performance of optical antennas., Ministerio de Economia y Competitividad (MINECO), Centro Mexicano de Innovación en Energía Solar from Fondo Sectorial CONACYT-Secretaría de EnergíaSustentabilidad Energética, National Laboratory program from CONACYT through the Terahertz Science and Technology National Lab (LANCYTT), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

En acceso abierto en la web del editor (comprobado en julio 2016). Received 20 Jun 2012; revised 23 Jul 2012; accepted 23 Jul 2012; published 3 Oct 2012., An experimental setup to measure the three-dimensional phase-intensity distribution of an infrared laser beam in the focal region has been presented. It is based on the knife-edge method to perform a tomographic reconstruction and on a transport of intensity equation-based numerical method to obtain the propagating wavefront. This experimental approach allows us to characterize a focalized laser beam when the use of image or interferometer arrangements is not possible. Thus, we have recovered intensity and phase of an aberrated beam dominated by astigmatism. The phase evolution is fully consistent with that of the beam intensity along the optical axis. Moreover, this method is based on an expansion on both the irradiance and the phase information in a series of Zernike polynomials. We have described guidelines to choose a proper set of these polynomials depending on the experimental conditions and showed that, by abiding these criteria, numerical errors can be reduced., Ministerio de Ciencia e Innovación (MICINN), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Accesible a texto completo en la web del editor., Finite-Differences Time-Domain (FDTD) algorithms are well established tools of computational electromagnetism. Because of their practical implementation as computer codes, they are affected by many numerical artefact and noise. In order to obtain better results we propose using Principal Component Analysis (PCA) based on multivariate statistical techniques. The PCA has been successfully used for the analysis of noise and spatial temporal structure in a sequence of images. It allows a straightforward discrimination between the numerical noise and the actual electromagnetic variables, and the quantitative estimation of their respective contributions. Besides, The GDTD results can be filtered to clean the effect of the noise. In this contribution we will show how the method can be applied to several FDTD simulations: the propagation of a pulse in vacuum, the analysis of two-dimensional photonic crystals. In this last case, PCA has revealed hidden electromagnetic structures related to actual modes of the photonic crystal., Ministerio de Ciencia y Tecnología of Spain, Consejería de Educación of the Comunidad de Madrid (Spain), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Esta es una versión preprint. Received 4 February 2009, Revised 14 May 2009, Accepted 21 May 2009, Available online 14 June 2009, We 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 the focus in terms of the number of zones. In addition, an experimental verification has been performed using a Spatial Light Modulator to implement the designed square Fresnel zones plates., Direccion General de Universidades e Investigacion de la Consejeria de Educacion de la Comunidad de Madrid, Universidad Complutense de Madrid, Ministerio de Educacion y Ciencia, European Social Fund, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Conferencia: International Conference on Trends in Nanotechnology, Segovia, España, del 13 al 17 de septiembre de 2004, Antenna-coupled optical detectors, also named optical antennas, are being developed and proposed as alternative detection devices for the millimetre, infrared, and visible spectra. Optical and infrared antennas represent a class of optical components that couple electromagnetic radiation in the visible and infrared wavelengths in the same way as radioelectric antennas do at the corresponding wavelengths. The size of optical antennas is in the range of the detected wavelength and they involve fabrication techniques with nanoscale spatial resolution. Optical antennas have already proved and potential advantages in the detection of light showing polarization dependence, tuneability, and rapid time response. They also can be considered as point detectors and directionally sensitive elements. So far, these detectors have been thoroughly tested in the mid-infrared with some positive results in the visible. The measurement and characterization of optical antennas requires the use of an experimental set-up with nanometric resolution. On the other hand, a computation simulation of the interaction between the material structures and the incoming electromagnetic radiation is needed to explore alternative designs of practical devices., Ministerio de Ciencia y Tecnologia (España), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

© 2010 Elsevier GmbH. We are deeply grateful to Dr. Eduard A. Phillipe, of EyeSys Laboratories Inc. for allowing us to use the ‘‘cornsag’’ utility. We also appreciate very much the collaboration of the Ophthalmology Department of the University Complutense of Madrid for facil- itating the use of the videokeratometer., This paper shows how corneal topographic data can be used to determine the value of the longitudinal spherical aberration. We have obtained the corneal profiles and the values of the longitudinal spherical aberration for the rays propagating within the steepest and flattest meridional planes, by using a real raytracing algorithm. These corneal profiles have been also fitted to conicoids and the asphericity parameter has been calculated. We have found that the longitudinal spherical aberration follows a parabolic dependence for a circular region of 5 mm in diameter. This parabolic dependence has been fitted with a polynomial function. The data provided by commercial topographic systems can be used to obtain the longitudinal spherical aberration along the selected meridians., Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

En O.A. en la web del editor. Received 19 October 2016; revised 20 December 2016; accepted 3 January 2017; posted 5 January 2017 (Doc. ID 279131); published 27 January 2017, When considering the pseudo-heterodyne mode for detection of the modulus and phase of the near field from scattering scanning near-field optical microscopy (s-SNOM) measurements, processing only the modulus of the signal may produce an undesired constraint in the accessible values of the phase of the near field. A two-dimensional analysis of the signal provided by the data acquisition system makes it possible to obtain phase maps over the whole [0, 2, Ministerio de Economía y Competitividad de España (MINECO), University of North Carolina at Charlotte, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Es una versión postprint. La versión publicada está en Open Access en la web del editor. © 2004 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited., We demonstrate the capabilities of principal component analysis (PCA) for studying the results of finite-difference time-domain (FDTD) algorithms in simulating photonic crystal microcavities. The spatial-temporal structures provided by PCA are related to the actual electric field vibrating inside the photonic microcavity. A detailed analysis of the results has made it possible to compute the phase maps for each mode of the arrangement at their respective resonant frequencies. The existence of standing wave behavior is revealed by this analysis. In spite of this, some numerical artifacts induced by FDTD algorithms have been clearly detailed through PCA analysis. The data we have analyzed are a given set of maps of the electric field recorded during the simulation., Ministerio de Ciencia y Tecnología de España, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

© 2005 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.”, Finite-difference time-domain (FDTD) algorithms are affected by numerical artifacts and noise. In order to obtain better results we propose the use of the principal component analysis based on multivariate statistical techniques. It allows a straightforward discrimination between the numerical noise and the actual electromagnetic field distributions, and the quantitative estimation of their respective contributions. Besides, the FDTD results can be filtered to clean the effect of the noise. The method has been applied successfully to two dimensional simulations: propagation of a pulse in vacuum using total field-scattered field techniques, and mode computation in a two-dimensional photonic crystal. In this last case, PCA has revealed hidden electromagnetic structures related to actual modes of the photonic crystal., Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Revista cerrada en el año 2010, La investigación sobre el comportamiento de estructuras metálicas cuyo tamaño es comparable a la longitud de onda de la radiación detectada puede realizarse considerándolas como antenas detectoras de radiación óptica. El diseño, análisis y caracterización de estos dispositivos requiere el estudio de los fenómenos básicos de interacción entre la radiación y la materia. A la vez, su inclusión en sistemas con relevancia tecnológica requiere la medida y caracterización de sus propiedades. Nuestro equipo de investigación, integrado en el «Grupo Complutense de Óptica Aplicada», se ha dedicado durante los últimos años al estudio de estos dispositivos así como a la caracterización de todo tipo de detectores de luz, y a la definición de aquellas figuras de mérito que son relevantes a la hora de establecer su uso., The investigation about metallic structures behaviour, wich size is comparable to warw length of detected radiation, can me done considering them as detector antena of optical radiation. Design, analysis and characterization of these dispositives recquire the study of basic phenomena in interaction between radiation and mathery. El sewhere, its inclusionin technology characterization of its properties our invetigation group, integrated in "Applied Optics Complutense group", has been dedicated last years to the study of this dispositive and to the characterization of every kind of light detectors, and the definition of these figures of merit that are relevant at the moment of define their use, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Es una versión prprint., The longitudinal and transverse angular shifts in the refraction of a paraxial beam are calculated by using the plane-wave decomposition of the amplitude of the electric field distribution of the incident beam. The transmission coefficients are expanded into powers of the spatial frequencies. In this paper these spatial frequencies need to be within the paraxial approach around the main direction of propagation of the beam. The beam is characterized by the moments of the square of the modulus of the angular spectrum of the electric field. To compute them, it is necessary to calculate how the spatial frequencies of the beam change along the refraction. The state of polarization of the beam is also included in the analysis. Numerical results are obtained to show the dependence of the angular shifts on the polarization’s state and the symmetry of the beam., Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

This paper was published in [Optics Express] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S6-A1538]. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law., Arrays of metallic thermocouples in the shape of spiral nanoantennas are proposed as infrared detectors, which use the thermoelectric properties of the metallic interfaces to generate electrical DC signals. The responsivity of these types of antennas is evaluated from both theoretical and numerical perspectives pointing out its potential as infrared sensors. Moreover, the same structures can be used to characterize the state of polarization of the optical near fields with a spatial resolution comparable to the wavelength., Fondo Sectorial CONACYT-Secretaría de Energía-Sustentabilidad Energética”, CONACYT, FONDECYT, Ministerio de Innovación de España, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

© 2006 Society of Photo-Optical Instrumentation Engineers. This work has been partially supported by the project TIC2001-1259 of the Ministerio de Ciencia y Tecnología of Spain., The flux transfer efficiency of an optical array with spatial integration has been improved by adding a new element at the input surface. The optical characteristics of the input surfaces of the individual units do not affect the spatial integration property. We propose to fill this input surface with a nested optical array designed to transfer as much energy as possible to the plane of the synthetic image of the spatial integrator array. Several designs for the individual units of this array are discussed. The most promising design consists of a cylindrical axicon-diopter element. This element has been simulated, fabricated, and tested, showing the expected improvement in performance., Ministerio de Ciencia y Tecnología, España, Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

ISBN: 978-162841713-5 CODEN: PSISD Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited., One of the main technical difficulties in the fabrication of optical antennas working as light detectors is the proper design and manufacture of auxiliary elements as load lines and signal extraction structures. These elements need to be quite small to reach the location of the antennas and should have a minimal effect on the response of the device. Unfortunately this is not an easy task and signal extraction lines resonate along with the antenna producing a complex signal that usually masks the one given by the antenna. In order to decouple the resonance from the transduction we present in this contribution a parametric analysis of the response of a bolometric stripe that is surrounded by resonant dipoles with different geometries and orientations. We have checked that these elements should provide a signal proportional to the polarization state of the incoming light., Ministerio de Economia y Competitividad (MINECO), Centro Mexicano de Innovacin en Energa Solar from Fondo Sectorial CONACYT-Secretara de EnergaSustentabilidad Energtica, National Laboratory program from CONACYT through the Terahertz Science and Technology National Lab (LANCYTT), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

Available online 13 October 2016, publicado en papel n enero de 2017, Depto. de Optometría y Visión, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-7-1957]. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law., Directional steerability can be obtained for an array of optical antennas through selective heating of the individual elements. Heating changes electrical conductivity of the heated element, which affects the phase of the generated currents. The variation in temperature can be obtained by modifying the biasing point of the individual elements of the array, which would allow fast reconfiguration. The numerical evaluation of the performance of an array of a reduced number of antennas (2 and 3) shows the feasibility of this approach., Ministerio de Ciencia e Innovación de España, Fondo Sectorial CONACYT-Secretaría de Energía-Sustentabilidad Energética, Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub