Exploració per autor "Herrero Simon, Ramon"
Ara es mostren els items 62-81 de 128
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Light control by Non-Hermitian modulation in multimode fiber
Akhter, Mohammad Nayeem; Benadouda Ivars, Salim; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (META Conference, 2022)
Text en actes de congrés
Accés obertWe show that a non-Hermitian modulation of the potential along the nonlinear multimode fibers controls dynamics of propagating radiation. Specifically we consider simultaneous modulation of the refraction index and gain/loss ... -
Light control by scattering cancellation in ordered and disordered non-Hermitian media, direct and inverse design
Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2023)
Text en actes de congrés
Accés obertNon-Hermitian Physics has emerged as a fertile ground for a smart control of waves. Here, we present direct and inverse-design strategies to achieve ‘on demand’ dynamical manipulation of light by non-Hermitian potentials. ... -
Light in materials with periodic gain-loss modulation on a wavelength scale
Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2010-07-22)
Article
Accés restringit per política de l'editorial -
Locally parity-time-symmetric and globally parity-symmetric systems
Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (2016-11-11)
Article
Accés obertWe introduce a class of systems holding parity-time (PT) symmetry locally, whereas being globally P symmetric. The potential, U = U(vertical bar r vertical bar), fulfills PT symmetry with respect to periodically distributed ... -
Management of Light Patterns Based on Local Hilbert Transform
Staliunas, Kestutis; Ahmed, W.; Botey Cumella, Muriel; Herrero Simon, Ramon; Hayran, Zeki; Kurt, H. (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
Botey Cumella, Muriel; Pradeep Kumar, Nikhil; Herrero Simon, Ramon; Maigyte, Lina; Staliunas, Kestutis (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
Cheng, Yu-Chieh; Wang, Pei-Yu; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (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
Akhter, Mohammad Nayeem; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (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 ... -
Near surface geophysical analysis of the Navamuño depression (Sierra de Béjar, Iberian Central System): geometry, sedimentary infill and genetic implications of tectonic and glacial footprint
Carrasco González, Rosa M.; Turu Michels, Valentí; Pedraza Gilsanz, Javier de; Herrero Simon, Ramon (2018-08-15)
Article
Accés obertThe geometric and genetic characterization of the Navamuño depression peatland system (Iberian Central System) is presented here using results from a geophysical survey. This depression is a ~30¿ha pseudo-endorheic flat ... -
Negative diffraction by a periodically modulated loss
Botey Cumella, Muriel; Pradeep Kumar, Nikhil; Herrero Simon, Ramon; Maigyte, Lina; Picó, Ruben; Staliunas, Kestutis (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
Botey Cumella, Muriel; Herrero Simon, Ramon; Medina Pardell, Judith; Staliunas, Kestutis (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
Medina Pardell, Judith; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (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
Botey Cumella, Muriel; Waseem Ahmed, Waqas; Medina Pardell, Judith; Herrero Simon, Ramon; Staliunas, Kestutis (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
Benadouda Ivars, Salim; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (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
Herrero Simon, Ramon; Medina Pardell, Judith; Botey Cumella, Muriel; Staliunas, Kestutis (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
Akhter, Mohammad Nayeem; Benadouda Ivars, Salim; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (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
Staliunas, Kestutis; Waseem Ahmed, Waqas; Botey Cumella, Muriel; Herrero Simon, Ramon (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
Akhter, Mohammad Nayeem; Benadouda Ivars, Salim; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (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
Herrero Simon, Ramon; Benadouda Ivars, Salim; Botey Cumella, Muriel; Staliunas, Kestutis (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
Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (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 ...