Depósito Digital de Documentos de la UAB Encontrados 23 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.00 segundos. 
1.
4 p, 361.0 KB Conical refraction as a tool for polarization metrology / Peinado Capdevila, Alba (Universitat Autònoma de Barcelona. Departament de Física) ; Turpin Avilés, Alejandro (Universitat Autònoma de Barcelona. Departament de Física) ; Lizana Tutusaus, Ángel (Universitat Autònoma de Barcelona. Departament de Física) ; Fernández, Estefania (Universitat Autònoma de Barcelona. Departament de Física) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
A method for polarization metrology based on the conical refraction (CR) phenomenon, occurring in biaxial crystals, is reported. CR transforms an input Gaussian beam into a light ring whose intensity distribution is linked to the incoming polarization. [...]
2013 - 10.1364/OL.38.004100
Optics letters, Vol. 38, No. 20 (15 October 2013) , p. 4100-4103  
2.
3 p, 278.7 KB Free-space optical polarization demultiplexing and multiplexing by means of conical refraction / Turpin Avilés, Alejandro (Universitat Autònoma de Barcelona. Departament de Física) ; Loiko, Yurii (Universitat Autònoma de Barcelona. Departament de Física) ; Kalkandjiev, Todor Kirilov (Universitat Autònoma de Barcelona. Departament de Física) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Polarization demultiplexing and multiplexing by means of conical refraction is proposed to increase the channel capacity for free-space optical communication applications. The proposed technique is based on the forward-backward optical transform occurring when a light beam propagates consecutively along the optic axes of two identical biaxial crystals with opposite orientations of their conical refraction characteristic vectors. [...]
2012 - 10.1364/OL.37.004197
Optics letters, Vol. 37, No. 20 (15 October 2012) , p. 4197-4199  
3.
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  
4.
3 p, 409.3 KB Enhancement of the broadband modulation diffraction efficiency of liquid-crystal displays / Albero, Jorge (Universidad Miguel Hernández. Departamento de Ciencia de Materiales, Optica y Tecnología Electrónica) ; Moreno Soriano, Ignacio (Universidad Miguel Hernández. Departamento de Ciencia de Materiales, Optica 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  
5.
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  
6.
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 Soriano, Ignacio (Universidad Miguel Hernández. Departamento de Ciencia de Materiales, Optica 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 (Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal) ; Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Fisica) ; 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  
7.
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  
8.
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  
9.
3 p, 508.0 KB Achromatic diffractive lens written onto a liquid crystal display / Márquez Ruiz, Andrés (Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal) ; Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Fisica) ; 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  
10.
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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