Exploració per autor "Botey Cumella, Muriel"
Ara es mostren els items 37-56 de 100
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Management of Light Patterns Based on Local Hilbert Transform
(2018)
Text en actes de congrés
Accés restringit per política de l'editorialWe propose a new approach of optical field management based on a local Hilbert transform, where the non-Hermitian potentials generating arbitrary vector fields of directionality p(\vec r), with desired shapes and topologies ... -
Managing spatial diffraction through a periodic loss modulation
(2014)
Comunicació de congrés
Accés obertWe show that periodic distributions of gain or losses on the wavelength scale allow managing spatial diffraction of light beams, with no index contrast. It has been recently predicted that such artificial periodic structures, ... -
Meta-mirrors with transverse invariance for beam shaping
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2019)
Text en actes de congrés
Accés restringit per política de l'editorialThe paper demonstrates spatial filtering in reflection based on meta-mirrors, composed of periodic subwavelength gratings. The periodic modulation of the refraction index on the sub-micron scale exhibits optical beam shaping ... -
Mode-cleaning in antisymmetrically modulated non-Hermitian waveguides
(2024-01-12)
Article
Accés obertWe demonstrate all-optical spatial mode-cleaning in non-Hermitian waveguides. The effect is accounted by a unidirectional coupling among the modes resulting from a simultaneous modulation of the refractive index and the ... -
Negative diffraction by a periodically modulated loss
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Comunicació de congrés
Accés restringit per política de l'editorial -
Non-Hermitian arrangement for stable semiconductor laser arrays
(2021-06-16)
Report de recerca
Accés obertWe propose and explore a physical mechanism for the stabilization of the complex spatiotemporal dynamics in arrays (bars) of broad area laser diodes taking advantage of the symmetry breaking in non-Hermitian potentials. ... -
Non-Hermitian arrangement for stable semiconductor laser arrays
(2021-07-19)
Article
Accés obertWe propose and explore a physical mechanism for the stabilization of the complex spatiotemporal dynamics in arrays (bars) of broad area laser diodes taking advantage of the symmetry breaking in non-Hermitian potentials. ... -
Non-Hermitian broad aperture semiconductor lasers based on PT-symmetry
(2019)
Text en actes de congrés
Accés obertIn this paper we propose a novel configuration to regularize the complex spatiotemporal dynamics of broad area lasers into bright light beam. It has recently been shown that arbitrary non-Hermitian optical potentials based ... -
Non-Hermitian control of optical turbulence in systems with fractional dispersion
(Elsevier, 2022-12-01)
Article
Accés obertWe show an efficient mechanism to control optical turbulence in systems with different dispersion laws, including parabolic, sub-diffractive, hyper-diffractive or general fractional dispersion. The method is based on the ... -
Non-Hermitian coupled semiconductor laser array
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2022)
Text en actes de congrés
Accés obertWe propose and explore a stabilization mechanism of a semiconductor laser array based on asymmetric coupling between neighboring lasers. The stabilization scheme takes advantage of the symmetry breaking of non-Hermitian ... -
Non-Hermitian light control in periodically modulated multimode fibers
(2023)
Text en actes de congrés
Accés restringit per política de l'editorialWe propose a new light management mechanism in graded index (GRIN) multimode fibers (MMFs) that allow to control the spectral mode distribution of the propagated beam. The effect is achieved through longitudinal non-Hermitian ... -
Non-Hermitian Light Management Based on Local Hilbert Transform
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Text en actes de congrés
Accés restringit per política de l'editorialLight patterns; Metamaterials; Non-Hermitian optics; Microlasers -
Non-Hermitian mode cleaning in periodically modulated multimode fibers
(2022-11-23)
Report de recerca
Accés obertWe show that the simultaneous modulation of the propagation constant and of the gain/loss coefficient along the multimode fibers results in unidirectional coupling among the modes, which, depending on the modulation ... -
Non-Hermitian modulations for stabilization of VCSEL, EEL and EEL arrays
(2023)
Text en actes de congrés
Accés restringit per política de l'editorialSemiconductor lasers and laser arrays emit temporally unstable and low spatial quality beams associated to intrinsic dynamical spatiotemporal instabilities. W e propose the simultaneous modulations of refractive index and ... -
Nondiffractive-nondiffusive beams in complex crystals
(2014-06-16)
Article
Accés obertThe study of spatial dispersion of two-dimensional complex crystals, with periodic modulations of both gain-loss and the refractive index, reveals simultaneous nondiffractive-nondiffusive light propagation. Narrow light ... -
Nonlinear Light Generation at the High Energy Range of a 3D Opal Film
(2009)
Text en actes de congrés
Accés obert -
Una nova experiència docent: cursos voluntaris de preparació als estudis de grau en enginyeria
(Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2012-07-06)
Comunicació de congrés / Text en actes de congrés
Accés obertDescrivim una nova experiència iniciada a l'EUETIB el setembre de 2010: un curs de física de preparació als estudis de grau en enginyeria. En descrivim la organització, el finançament, funcionament i resultats. Constatem ... -
Numerical and experimental demonstration of a wavelength demultiplexer design by point-defect cavity coupled to a tapered photonic crystal waveguide
(2016-01-01)
Article
Accés obertWe propose and experimentally demonstrate a demultiplexer with point-defect resonators and a reflection feedback mechanism in a photonic crystal waveguide (PCW). A tapered PCW has been chosen as the necessary reflector, ... -
Optical turbulence control by non-Hermitian potentials
(American Physical Society, 2022-03-01)
Article
Accés obertWe propose a method for a control of turbulence by modifying the excitation cascade leading to turbulence. The method is based on the asymmetric coupling between the spatiotemporal excitation modes by non-Hermitian potentials. ... -
Polarization-independent broadband bidirectional optical cloaking using a new type of inverse scattering approach
(Institute of Electrical and Electronics Engineers (IEEE), 2017)
Text en actes de congrés
Accés obertSince the advent of transformation optics a decade ago [1], the ability to achieve optical cloaking has become a matter of practical realization. However, so far extreme material requirements and large device areas have ...
