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Articles 39 records found  previous11 - 20nextend  jump to record: Search took 0.01 seconds. 
11.
3 p, 124.5 KB Spin-induced angular momentum switching / Fernández Calvo, Gabriel (Universitat Autònoma de Barcelona. Departament de Física) ; Picón Álvarez, Antonio (Universitat Autònoma de Barcelona. Departament de Física)
When light is transmitted through optically inhomogeneous and anisotropic media the spatial distribution of light can be modified according to its input polarization state. A complete analysis of this process, based on the paraxial approximation, is presented, and we show how it can be exploited to produce a spin-controlled change in the orbital angular momentum of light beams propagating in patterned space-variant optical axis phase plates. [...]
2007 - 10.1364/OL.32.000838
Optics letters, Vol. 32, No. 7 (1 April 2007) , p. 838-840  
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12.
3 p, 409.3 KB Enhancement of the broadband modulation diffraction efficiency of liquid-crystal displays / Albero, Jorge (Universidad Miguel Hernández de Elche. Departamento de Ciencia de Materiales, Óptica y Tecnología Electrónica) ; Moreno, Ignacio (Universidad Miguel Hernández de Elche. Departamento de Ciencia de Materiales, Óptica y Tecnología Electrónica) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We report a method to maximize the broadband modulation diffraction efficiency of liquid-crystal spatial light modulators for polychromatic applications requiring a wide range of wavelengths. An optimized encoding pattern based on the minimum Euclidean projection principle is applied in order to increase the diffraction efficiency at large wavelengths that exhibit phase modulation depth lower than 2p. [...]
2012 - 10.1364/OL.37.000052
Optics letters, Vol. 37, No. 1 (1 January 2012) , p. 52-54  
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13.
3 p, 255.9 KB Optical pattern recognition based on color vision models / Millán García-Varela, M. Sagrario (Universitat Politècnica de Catalunya) ; Corbalán Fuertes, Montserrat (Universitat Politècnica de Catalunya) ; Romero, J. (Universidad de Granada. Departamento de Óptica) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
A channel transformation based on opponent-color theory of the color vision models is applied to optical pattern recognition so that the conventional red, green, and blue (RGB) channels are transformed into bright-dark, red-green, and yellow-blue (ATD) channels. [...]
1995 - 10.1364/OL.20.001722
Optics letters, Vol. 20, No. 16 (15 August 1995) , p. 1722-1724  
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14.
3 p, 286.8 KB Combined Mueller and Jones matrix method for the evaluation of the complex modulation in a liquid-crystal-on-silicon display / Moreno, Ignacio (Universidad Miguel Hernández de Elche. Departamento de Ciencia de Materiales, Óptica y Tecnología Electrónica) ; Lizana Tutusaus, Ángel (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Márquez Ruiz, Andrés (Universitat d'Alacant. Departament de Física, Enginyeria de Sistemes i Teoria de la Senyal) ; Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
We apply the polar decomposition of the Mueller matrix describing a liquid-crystal-on-silicon display to identify the diattenuator, depolarizer, and retarder contributions as a function of the gray level. [...]
2008 - 10.1364/OL.33.000627
Optics letters, Vol. 33, No. 6 (15 March 2008) , p. 627-629  
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15.
3 p, 74.1 KB Improved expressions for performance parameters for complex filters / Sheppard, Colin J. R. (National University of Singapore. Division of Bioengineering) ; Ledesma, Silvia (Universidad de Buenos Aires. Departamento de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Escalera Merino, Juan Carlos (Universitat Autònoma de Barcelona. Departament de Física)
Improved expressions are given for the performance parameters for transverse and axial gains for complex pupil filters. These expressions can be used to predict the behavior of filters that give a small axial shift in the focal intensity maximum and also predict the changes in gain for different observation planes.
2007 - 10.1364/OL.32.001713
Optics letters, Vol. 32, No. 12 (15 June 2007) , p. 1713-1715  
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16.
3 p, 226.9 KB Tailoring the depth of focus for optical imaging systems using a Fourier transform approach / Davis, Jeffrey A. (San Diego State University. Department of Physics) ; Tuvey, C. Stewart (San Diego State University. Department of Physics) ; López Coronado, Octavio (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
We show how to tailor the depth of focus for an optical system using pupil functions obtained from a Fourier transform approach. These complex amplitude and phase pupil functions are encoded onto a single liquid-crystal spatial light modulator. [...]
2007 - 10.1364/OL.32.000844
Optics letters, Vol. 32, No. 7 (1 April 2007) , p. 844-846  
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17.
3 p, 508.0 KB Achromatic diffractive lens written onto a liquid crystal display / Márquez Ruiz, Andrés (Universitat d'Alacant. Departament de Física, Enginyeria de Sistemes i Teoria de la Senyal) ; Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
We propose a programmable diffractive lens written onto a liquid crystal display (LCD) that is able to provide equal focal lengths for several wavelengths simultaneously. To achieve this goal it is necessary that the LCD operate in the phase-only regime simultaneously for the different wavelengths. [...]
2006 - 10.1364/OL.31.000392
Optics letters, Vol. 31, No. 3 (1 February 2006) , p. 392-394  
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18.
3 p, 93.3 KB Integration in the Fourier domain for restoration of a function from its slope : comparison of four methods / Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yaroslavsky, Leonid P. (Tel Aviv University. Department of Interdisciplinary Studies) ; Moreno Soriano, Alfonso (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
In some measurement techniques the profile, f(x), of a function should be obtained from the data on measured slope f'(x) by integration. The slope is measured in a given set of points, and from these data we should obtain the profile with the highest possible accuracy. [...]
2002 - 10.1364/OL.27.001986
Optics letters, Vol. 27, No. 22 (15 November 2002) , p. 1986-1988  
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19.
3 p, 290.0 KB Evaluation and correction of aberrations in an optical correlator by phase-shifting interferometry / Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Física) ; Moreno Soriano, Alfonso (Universitat Autònoma de Barcelona. Departament de Física) ; Nicolás, Josep (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We propose a new method for evaluating and correcting aberrations in a Vander Lugt correlator. The technique is achieved with liquid-crystal displays of the correlator and allows the task to be performed in situ. [...]
2003 - 10.1364/OL.28.001117
Optics letters, Vol. 28, No. 13 (1 July 2003) , p. 1117-1119  
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20.
3 p, 453.7 KB Simple expressions for performance parameters of complex filters, with applications to super-Gaussian phase filters / Ledesma, Silvia (Universidad de Buenos Aires. Departamento de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Escalera Merino, Juan Carlos (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
To study the three-dimensional (3-D) behavior produced by complex filters, we have extended the expressions for the axial and the transverse gain to the case in which the best image plane is not near the paraxial focus. [...]
2004 - 10.1364/OL.29.000932
Optics letters, Vol. 29, No. 9 (1 May 2004) , p. 932-934  
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