Enviaments recents

  • Controlling monoterpene isomerization by guiding challenging carbocation rearrangement reactions in engineered squalene-hopene cyclases 

    Ludwig, Julian; Curado Carballada, Christian; Hammer, Stephan C.; Schneider, Andreas; Diether, Svenja; Kress, Nico; Ruiz Barragán, Sergio; Osuna Oliveras, Silvia; Hauer, Bernhard (John Wiley & sons, 2024-03-18)
    Article
    Accés obert
    The interconversion of monoterpenes is facilitated by a complex network of carbocation rearrangement pathways. Controlling these isomerization pathways is challenging when using common Brønsted and Lewis acid catalysts, ...
  • Mode-cleaning in antisymmetrically modulated non-Hermitian waveguides 

    Akhter, Mohammad Nayeem; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2024-01-12)
    Article
    Accés obert
    We 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 ...
  • An equivalent lattice-modified model of interfering Bragg bandgaps and Locally Resonant Stop Bands for phononic crystal made from Locally Resonant elements 

    Redondo Pastor, Francisco Javier; Godinho, Luis; Staliunas, Kestutis; Sanchez Perez, Juan Vicente (2023-08-01)
    Article
    Accés obert
    The design and development of advanced devices based on metamaterials to control the transmission of acoustic waves is a hot topic. An important class of these metamaterials is based on phononic crystals with Locally ...
  • Spatially structured optical pump for laser generation tuning 

    Kontenis, Gabrielius; Gailevicius, Darius; Taranenko, Victor; Staliunas, Kestutis (2023-12-23)
    Article
    Accés obert
    The goal and essential parameter of laser light conversion is achieving emitted radiation of higher brightness. For many applications, the laser beam must have the highest available beam quality and highest achievable ...
  • Resonant x-ray difference frequency generation 

    Serrat Jurado, Carles (2023-12-28)
    Article
    Accés restringit per política de l'editorial
    Resonantly enhanced x-ray difference-frequency generation (re-XDFG) is a second-order nonlinear effect that involves illuminating a molecule with two-color x-ray pulses with photon energies O1 and O2. The energy difference ...
  • All-regions tunable high harmonic enhancement by a periodic static electric field 

    Serrat Jurado, Carles; Biegert, Jens (American Institute of Physics (AIP), 2010-02-19)
    Article
    Accés obert
    Simulations show that a static electric field periodically distributed in space can be used to control the production of coherent light by high-order harmonic generation in a wide spectral range covering extremeultraviolet ...
  • Permutation entropy-based characterization of speckle patterns generated by semiconductor laser light 

    Tirabassi, Giulio; Duque Gijón, María; Tiana Alsina, Jordi; Masoller Alonso, Cristina (2023-12)
    Article
    Accés obert
    Semiconductor lasers with optical feedback are stochastic nonlinear systems that can display complex dynamics and abrupt changes when their operation conditions change. Even very small changes can lead to large variations ...
  • Spectral shift and split of harmonic lines in propagation affected high harmonic generation in a long-interaction gas tube 

    Seres, Jozsef; Seres, Enikoe; Serrat Jurado, Carles; Dinh, Thanh Hung; Hasegawa, Noboru; Ishino, Masahiko; Nishikino, Masaharu; Namba, Shinichi (2023-12)
    Article
    Accés obert
    While generating high harmonics in long media of helium gas, at certain laser intensities and chirp, the spectral shift and split of the harmonic lines were experimentally observed, sometimes exceeding one harmonic order. ...
  • Timing jitter reduction in semiconductor lasers induced by optical injection 

    Duque Gijón, María; Quirce Teja, Ana; Tiana Alsina, Jordi; Masoller Alonso, Cristina; Valle Gutierrez, Ángel (2023-11-01)
    Article
    Accés restringit per política de l'editorial
    We present an experimental study of the effect of continuous-wave optical injection (OI) from a vertical-cavity surface-emitting laser (VCSEL) on the timing jitter of a gain-switched discrete-mode semiconductor laser (DML). ...
  • Entropy-based early detection of critical transitions in spatial vegetation fields 

    Tirabassi, Giulio; Masoller Alonso, Cristina (International Academy of Sciences (NAS), 2023-01-03)
    Article
    Accés obert
    In semiarid regions, vegetated ecosystems can display abrupt and unexpected changes, i.e., transitions to different states, due to drifting or time-varying parameters, with severe consequences for the ecosystem and the ...
  • Quantifying the synchronization of the spikes emitted by coupled lasers 

    Tiana Alsina, Jordi; Masoller Alonso, Cristina (Institute of Physics (IOP), 2023-07-01)
    Article
    Accés obert
    Synchronization phenomena is ubiquitous in nature, and in spite of having been studied for decades, it still attracts a lot of attention as is still challenging to detect and quantify, directly from the analysis of noisy ...
  • Experimental study of spatial and temporal coherence in a laser diode with optical feedback 

    Duque Gijón, María; Tiana Alsina, Jordi; Masoller Alonso, Cristina (Optical Society of American (OSA), 2023-06-19)
    Article
    Accés obert
    Optical feedback can reduce the linewidth of a semiconductor laser by several orders of magnitude, but it can also cause line broadening. Although these effects on the temporal coherence of the laser are well known, a good ...

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