El grup de recerca treballa en dues temàtiques principals:
- L'estudi de fenòmens òptics lineals i no lineals en cristalls fotònics i microcavitats.
- L'estudi de la dinàmica espaciotemporal de sistemes no lineals, sobretot de làsers i sistemes òptics en general.

http://futur.upc.edu/DONLL

The research group works on two main topics: linear and nonlinear optical phenomena in photonic crystals and microcavities, and the spatiotemporal dynamics of nonlinear systems, in particular lasers and optical systems.

http://futur.upc.edu/DONLL

The research group works on two main topics: linear and nonlinear optical phenomena in photonic crystals and microcavities, and the spatiotemporal dynamics of nonlinear systems, in particular lasers and optical systems.

http://futur.upc.edu/DONLL

Recent Submissions

  • Neuronal coupling benefits the encoding of weak periodic signals in symbolic spike patterns 

    Masoliver Vila, Maria; Masoller Alonso, Cristina (2020-03-01)
    Article
    Open Access
    The biophysical mechanisms by which an input signal elicits a neuronal response are well known (sufficiently large inputs change the membrane potential of the neuron and generate electrical pulses, known as action potentials ...
  • Inferring the connectivity of coupled chaotic oscillators using Kalman filtering 

    Forero Ortiz, Edwar Andres; Tirabassi, Giulio; Masoller Alonso, Cristina; Pons Rivero, Antonio Javier (Nature, 2021-11-17)
    Article
    Open Access
    Inferring the interactions between coupled oscillators is a significant open problem in complexity science, with multiple interdisciplinary applications. While the Kalman filter (KF) technique is a well-known tool, widely ...
  • Time crystal dynamics in a weakly modulated stochastic time delayed system 

    Tiana Alsina, Jordi; Masoller Alonso, Cristina (Nature, 2022-03-22)
    Article
    Open Access
    Time crystal oscillations in interacting, periodically driven many-particle systems are highly regular oscillations that persist for long periods of time, are robust to perturbations, and whose frequency difers from the ...
  • Nonlinear propagation effect in x-ray parametric amplification during high harmonic generation 

    Seres, Jozsef; Seres, Enikoe; Serrat Jurado, Carles; Dinh, Thanh Hung; Hasegawa, N.; Ishino, Masahiko; Nishikino, M.; Nakano, Kouji; Namba, Shinichi (2022-04-01)
    Article
    Restricted access - publisher's policy
    We report the realization and characterization of parametric amplification in high harmonic generation around 100 eV using He gas in a double gas jet arrangement. The delay of the seed extreme ultraviolet (XUV) pulse with ...
  • Nonlinear complexification of periodic orbits in the generalized Landau scenario 

    Herrero Simon, Ramon; Farjas Silva, Jordi; Pi Vila, Francesc; Orriols Tubella, Gaspar (2022-02)
    Article
    Open Access
    We have found a way for penetrating the space of the dynamical systems towards systems of arbitrary dimension exhibiting the nonlinear mixing of a large number of oscillation modes through which extraordinarily complex ...
  • Suppression of modulation instability in pump modulated flat-mirror VECSELs 

    Ahmed Waseem, Waqas Waseem; Kumar, Shubham; Herrero Simon, Ramon; Botey Cumella, Muriel; Radziunas, Mindaugas; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2016)
    Conference report
    Restricted access - publisher's policy
    We show that modulation instability (MI) can be suppressed in vertical external cavity surface emitting lasers (VECSELs) by introducing a periodic spatio-temporal modulation of the pump profile which in turn allows a simple ...
  • Experimental and Numerical Study of Locking of Low-Frequency Fluctuations of a Semiconductor Laser with Optical Feedback 

    Tiana Alsina, Jordi; Masoller Alonso, Cristina (2022-02)
    Article
    Open Access
    We study the output of a semiconductor laser with optical feedback operated in the lowfrequency fluctuations (LFFs) regime and subject to weak sinusoidal current modulation. In the LFF regime, the laser intensity exhibits ...
  • Non-Hermitian arrangement for stable semiconductor laser arrays 

    Botey Cumella, Muriel; Herrero Simon, Ramon; Medina Pardell, Judith; Staliunas, Kestutis (2021-06-16)
    Research report
    Open Access
    We 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. ...
  • 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 ...
  • Supercollimation of light beams by axisymmetric aperiodic photonic structures 

    Gailevicius, Darius; Aleksandravicius, Edvinas; Purlys, Vytautas; Staliunas, Kestutis (2021-12-14)
    Article
    Restricted access - publisher's policy
    Efficient beam supercollimation is proposed and shown experimentally by axisymmetric aperiodic photonic structures. The structure consists of equidistant layers of concentric refraction index rings, with the transverse ...
  • ENSO and SAM Influence on the Generation of Long Episodes of Rossby Wave Packets During Southern Hemisphere Summer 

    Pérez Fernández, Iago; Barreiro, Marcelo; Masoller Alonso, Cristina (2021-12-27)
    Article
    Restricted access - publisher's policy
    This study assesses the impact of low-frequency climate modes on Rossby Wave Packets (RWPs) during southern hemisphere summer. In particular, we focus on long-lived RWPs (lifespan above 8 days) and determine how El ...
  • Correlation lags give early warning signals of approaching bifurcations 

    Tirabassi, Giulio; Masoller Alonso, Cristina (2022-02-01)
    Article
    Open Access
    Identifying approaching bifurcations and regime transitions from observations is an important challenge in time series analysis with practical applications in many fields of science. Well-known indicators are the increase ...

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