Recent Submissions

  • Stabilization of microlasers by non-Hermitian potentials 

    Herrero Simon, Ramon; Botey Cumella, Muriel; Benadouda Ivars, Salim; Akhter, Mohammad Nayeem; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2023)
    Conference report
    Open Access
    Vertical-cavity semiconductor lasers as well as single units or arrays of Edge Emitting Lasers suffer from dynamical spatiotemporal instabilities leading to temporally unstable and low spatial beam quality. We propose a ...
  • DNS and POD analysis of separated flow in a three-dimensional diffuser 

    Miró Jané, Arnau; Eiximeno Franch, Benet; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol (Springer, 2023)
    Conference report
    Restricted access - publisher's policy
    A DNS of a three dimensional diffuser has been performed with the in-house solver Alya. The resulting dataset presents a good agreement with existing numerical and experimental data, even without smoothing of the sharp ...
  • Large nonlinear efficiency enhancement in the visible and UV range from plasmonic gold nanogratings 

    Cojocaru, Crina; Mukhopadhyay, Shroddha; Rodríguez Suñé, Laura; Vicenti, Maria Antonietta; Vilaseca Alavedra, Ramon; Scalora, Michael; Trull Silvestre, José Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference report
    Restricted access - publisher's policy
    We report a combined experimental/theoretical investigation on second and third harmonic generation from a plasmonic gold nanograting, that exhibits a plasmonic resonance in the near IR. The intense field localization leads ...
  • 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)
    Conference report
    Open Access
    We 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, ...
  • Non-Hermitian light control in periodically modulated multimode fibers 

    Akhter, Mohammad Nayeem; Benadouda Ivars, Salim; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2023)
    Conference report
    Open Access
    We 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 ...
  • Towards Data Driven Models for the Automotive Industry 

    Eiximeno Franch, Benet; Miró Jané, Arnau; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
    Conference report
    Restricted access - publisher's policy
    This study employs proper orthogonal decomposition to identify flow patterns linked to yaw angle variations in the Windsor body. A reduced order model is proposed to accurately predict variations in back pres- sure at ...
  • Compressibility effects on the wake dynamics of a circular cylinder 

    Rodríguez Pérez, Ivette María; Eiximeno Franch, Benet; Gasparino, Lucas; Tur Monge, Carlos; Muela Castro, Jordi; Lehmkuhl Barba, Oriol (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
    Conference report
    Open Access
    Compressible large-eddy simulations of the flow past a circular cylinder at Reynolds numbers Re = 104 and Mach numbers in the range M = 0.2-1.2 are performed. Changes in the wake dynamics, coherent structures and flow ...
  • Wall resolved large eddy simulations of a three-element high-lift airfoil at different angles of attack 

    Montalà Sales, Ricard; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
    Conference report
    Open Access
    A parametric study of the flow past the 30P30N three-element high-lift wing is conducted by changing the angle of attack (α = 5, 9 and 23◦) at a constant Reynolds number (Rec = 750, 000). Computational predictions are ...
  • 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)
    Conference report
    Open Access
    We 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 ...
  • Second and third harmonic generation from gold nanolayers: experiment versus theory 

    Rodríguez Suñé, Laura; Trull Silvestre, José Francisco; Akozbek, Neset; Ceglia, Domenico de; Vincenti, M. A.; Scalora, Michael; Cojocaru, Crina (EPJ Web of Conferences, 2021)
    Conference report
    Open Access
    The use of semiconductors, metals, or ordinary dielectrics in the process of fabrication of nanodevices is at the front edge of nowadays technology, exploiting the properties of light propagation and localization at ...
  • Análisis de escala simple de veinticinco años de registros de la red pluviométrica de Barcelona 

    Navarro Bosque, Javier; Kirchner Amor, Ricard; Rodríguez Solá, Raúl; Casas Castillo, M. del Carmen (Real Sociedad Española de Física (RSEF), 2022)
    Conference lecture
    Open Access
    El área metropolitana de Barcelona, de aproximadamente 100 Km2 de extensión, dispone de una red densa de pluviómetros de balancín que se empezó a instalar en 1983, y ha ido siendo gestionada desde entonces por diferentes ...
  • Turbulence control by non-Hermitian potentials 

    Benadouda Ivars, Salim; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2021)
    Conference report
    Open Access
    We propose a method to control turbulence by the introduction a non-Hermitian spatiotemporal modulation, based on the energy redirection from unstable to stable modes by the unidirectional coupling induced by these potentials ...

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