Exploració per autor "Herrero Simon, Ramon"
Ara es mostren els items 92-111 de 128
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Regularization of broad-area lasers by non-Hermitian potentials
Botey Cumella, Muriel; Ahmed Waseem, Waqas Waseem; Medina, Judith; Herrero Simon, Ramon; Wu, Ying; Staliunas, Kestutis (2019)
Text en actes de congrés
Accés obertIt was recently shown that arbitrary non-Hermitian optical potentials based on local Parity-Time (PT-) symmetry may control the flow of light, due to the asymmetric mode coupling. We propose periodic non-Hermitian potentials ... -
Regularization of vertical-cavity surface-emitting laser emission by periodic non-Hermitian potentials
Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Botey Cumella, Muriel; Wu, Ying; Staliunas, Kestutis (2019-08-15)
Article
Accés obertWe propose a novel physical mechanism based on periodicnon-Hermitian potentials to efficiently control the complexspatial dynamics of broad-area lasers, particularly in vertical-cavity surface-emitting lasers (VCSELs), ... -
Restricted Hilbert transform for feasible light management
Botey Cumella, Muriel; Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Wu, Yina; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2021)
Text en actes de congrés
Accés obertA feasible restricted Hilbert Transform (HT) is presented to solve the challenging practical realization of non-Hermitian systems, restricting the complex susceptibility within practical limits. Beyond closed-conservative ... -
Restricted Hilbert Transform for Non-Hermitian Management of Fields
Waseem Ahmed, Waqas; Herrero Simon, Ramon; Botey Cumella, Muriel; Wu, Ying; Staliunas, Kestutis (2020-10-07)
Article
Accés obertNon-Hermitian systems exploiting the synergy between the properties of closed-conservative systems and open-dissipative (gain-loss) systems have recently become the playground to uncover unusual physical phenomena. Indeed, ... -
Self-cleaning in non-Hermitian linear multimode fibers
Akhter, Mohammad Nayeem; Herrero Simon, Ramon; Staliunas, Kestutis; Botey Cumella, Muriel (Institute of Electrical and Electronics Engineers (IEEE), 2023)
Text en actes de congrés
Accés obertWe propose a self-cleaning mechanism in linear non-Hermitian graded index multimode fibers. The proposal is based a unidirectional coupling among transverse modes, induced by the introduction of a non-Hermitian potential, ... -
Self-collimated beams in 2D complex periodic lattices from P- to PT-symmetry
Ahmed Waseem, Waqas Waseem; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2017)
Text en actes de congrés
Accés obertWe analyze self-collimation in two-dimensional periodic complex lattices. We consider P-symmetric and PT-symmetric complex lattices with different geometries, where the periodic modulations of both refractive index and ... -
Self-collimation in 2D Complex P- and PT-symmetric systems
Botey Cumella, Muriel; Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Staliunas, Kestutis (2017)
Text en actes de congrés
Accés obertWe predict the self-collimation phenomena (or equivalently, dynamical localization) in 2-dimensional P-symmetric and PT-symmetric complex potentials, with periodic modulations of both gain/loss and refractive index. ... -
Self-collimation in PT -symmetric crystals
Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (AMER PHYSICAL SOC, 2017-05-10)
Article
Accés obertWe predict the self-collimation phenomena (or equivalently, dynamical localization) in two-dimensional PT-symmetric complex potentials, where the complex modulation is considered in the transverse, longitudinal, or ... -
Simulations and analysis of beam quality improvement in spatially modulated broad area edge-emitting devices
Radziunas, Mindaugas; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialWe simulate and analyze how beam quality improves while being amplified in edge emitting broad area semiconductor amplifiers with a periodic structuring of the electrical contacts, in both longitudinal and lateral directions. ... -
Slow light enabled wavelength demultiplexing
Hayran, Zeki; Turduev, M.; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis; Kurt, H. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
Text en actes de congrés
Accés obertPhotonic crystal waveguides supporting band gap guided modes hold great potential to tailor the group velocity of propagating light. We propose and explore different wavelength demultiplexer design approaches that ... -
Sound directivity by PT-symmetric acoustic dipoles
Magariyachi, Tetsu; Arias Casals, Helena; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2021)
Text en actes de congrés
Accés obertThe new physics of open-dissipative, non-Hermitian systems have become a fruitful playground to uncover novel physical phenomena, even in exotic or counterintuitive ways, especially in optics and, more recently, also in ... -
Spatial filtering in edge-emitting lasers by intracavity chirped photonic crystals
Gawali, Sandeep Babu; Medina Pardell, Judith; Gailevicius, D.; Purlys, Vytautas; Garre Werner, Guillermo; Cojocaru, Crina; Trull Silvestre, José Francisco; Botey Cumella, Muriel; Herrero Simon, Ramon; Montiel Ponsoda, Joan; Staliunas, Kestutis (2020-10-01)
Article
Accés obertIn this work, we report an experimental and numerical study of the intracavity spatial filtering in edge-emitting lasers using a chirped photonic crystal (PhC) as the filtering element in the near-field domain. We provide ... -
Spatial noise reduction in broad area semiconductors
Herrero Simon, Ramon; Botey Cumella, Muriel; Pradeep Kumar, Nikhil; Staliunas, Kestutis (IEEE, 2012)
Text en actes de congrés
Accés restringit per política de l'editorial -
Spatiotemporal stabilization of PT-symmetric BAS lasers
Medina Pardell, Judith; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2020)
Text en actes de congrés
Accés restringit per política de l'editorialWe propose a compact solution to spatially regularize and temporally stabilize edge emitting (broad area) semiconductor lasers. The scheme relays on the local asymmetries generated by a non-Hermitian potential with a central ... -
Spatiotemporal stabilization proof of concept of Broad Area Semiconductor laser sources
Medina Pardell, Judith; Ahmed Waseem, Waqas Waseem; Kumar, Shubham; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2018-02)
Report de recerca
Accés obertWe provide a numerical proof of concept of a stabilization mechanism for BAS laser sources. The scheme is based on the simultaneous introduction of in-phase two-dimensional modulations on the refractive index and pump ... -
Stabilisation of spatially periodic states by non-Hermitian potentials
Benadouda Ivars, Salim; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2023-03)
Article
Accés restringit per política de l'editorialWe uncover new families of stable periodic solutions by the introduction of non-Hermitian potentials in the universal complex Ginzburg–Landau equation. We perform a comprehensive analysis on the dynamics and stability of ... -
Stabilization of Broad Area Semiconductor Amplifiers and Lasers by Double Modulation of Pump and Refractive Index
Ahmed Waseem, Waqas Waseem; Kumar, Shubham; Medina Pardell, Judith; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2018)
Text en actes de congrés
Accés restringit per política de l'editorialBroad Area Semiconductor Amplifiers and Lasers display instability of the homogeneous state typically related with self-focusing nonlinearities, inducing multi-transverse mode operation and filamentation that deteriorates ... -
Stabilization of Broad Area Semiconductor Laser Sources
Medina Pardell, Judith; Ahmed Waseem, Waqas Waseem; Kumar, Shubham; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2018)
Text en actes de congrés
Accés obertWe numerically proof the stabilization of broad area semiconductor laser sources by introducing simultaneous in-phase two-dimensional modulations on the refractive index and on the pump (gain). We also examine the interplay ... -
Stabilization of broad area semiconductor lasers
Kumar, Shubham; Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2018)
Text en actes de congrés
Accés restringit per política de l'editorialBroad Area Semiconductor edge-emitting lasers typically display self-focusing nonlinearity due to the refractive index dependence on the population inversion. It induces the homogeneous solution instability, multi-transverse ... -
Stabilization of broad-area semiconductor laser sources by simultaneous index and pump modulations
Waseem Ahmed, Waqas; Kumar, Shubham; Medina Pardell, Judith; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2018-06-01)
Article
Accés obertWe show that the emission of broad-area semiconductor amplifiers and lasers can be efficiently stabilized by introducing two-dimensional periodic modulations simultaneously on both the refractive index and the pump (gain–loss) ...