Enviaments recents

  • Enhancement of nonlinear optical phenomena by localized resonances 

    Rodríguez Echarri, A.; Cox, Joel D.; Yu, Renwen; García de Abajo, F. Javier (ACS, 2018-01-20)
    Article
    Accés restringit per política de l'editorial
    Nonlinear optics at the nanoscale is severely limited by the small departure of available materials from linear behavior. Despite intense efforts placed into overcoming this problem using multiple strategies for enhancing ...
  • Enhanced graphene nonlinear response through geometrical plasmon focusing 

    Saavedra, J. R. M.; García de Abajo, F. Javier (AIP, 2018-01-01)
    Article
    Accés restringit per política de l'editorial
    We propose a simple approach to couple light into graphene plasmons and focus these excitations at focal spots of a size determined by the plasmon wavelength, thus producing high optical field enhancement that boosts the ...
  • Transient nonlinear plasmonics in nanostructured graphene 

    COX, JOEL D.; GARCÍA DE ABAJO, F. JAVIER (OSA, 2018-04-06)
    Article
    Accés obert
    Plasmons in highly doped graphene offer the means to dramatically enhance light absorption in the atomically thin material. Ultimately the absorbed light energy induces an increase in electron temperature, accompanied by ...
  • Electron refraction at lateral atomic interfaces 

    Abd El-Fattah, Z. M.; Kher-Elden, M A.; Yassin, O.; El-Okr, M. M.; Ortega, J. E.; García de Abajo, F. J. (AIP, 2017-10-01)
    Article
    Accés restringit per política de l'editorial
    We present theoretical simulations of electron refraction at the lateral atomic interface between a “homogeneous” Cu(111) surface and the “nanostructured” one-monolayer (ML) Ag/Cu(111) dislocation lattice. Calculations ...
  • Ultrafast nonlinear optical response of Dirac fermions in graphene 

    Baudisch, Matthias; Marini, Andrea; Cox, Joel D.; Zhu, Tony; Silva, Francisco; Teichmann, Stephan; Massicotte, Mathieu; Koppens, Frank; Levitov, Leonid S.; García de Abajo, F. Javier; Biegert, Jens (Nature, 2018-03-09)
    Article
    Accés obert
    The speed of solid-state electronic devices, determined by the temporal dynamics of charge carriers, could potentially reach unprecedented petahertz frequencies through direct manipulation by optical fields, consisting ...
  • Optimization of Nanoparticle-Based SERS Substrates through Large-Scale Realistic Simulations 

    Solís, Diego M.; Taboada, José M,; Obelleiro, Fernando; Liz-Marzán, Luis M.; García de Abajo, Francisco Javier (ACS, 2016-12-20)
    Article
    Accés obert
    Surface-enhanced Raman scattering (SERS) has become a widely used spectroscopic technique for chemical identification, providing unbeaten sensitivity down to the singlemolecule level. The amplification of the optical ...
  • Nonlinear Plasmonic Sensing with Nanographene 

    Yu, Renwen; Cox, Joel D.; García de Abajo, Francisco Javier (APS, 2016-09-16)
    Article
    Accés obert
    Plasmons provide excellent sensitivity to detect analyte molecules through their strong interaction with the dielectric environment. Plasmonic sensors based on noble metals are, however, limited by the spectral broadening ...
  • Plasmons in doped finite carbon nanotubes and their interactions with fast electrons and quantum emitters 

    Vega, Sandra de; Cox, Joel D.; García de Abajo, Javier (APS, 2016-08-31)
    Article
    Accés obert
    We study the potential of highly doped finite carbon nanotubes to serve as plasmonic elements that mediate the interaction between quantum emitters. Similar to graphene, nanotubes support intense plasmons that can be ...
  • Smith-Purcell radiation emission in aperiodic arrays 

    Saavedra, J. R. M.; Castells-Graells, D.; García de Abajo, F. Javier (APS, 2016-07-13)
    Article
    Accés obert
    We study the Smith-Purcell light emission produced by electrons moving parallel to linear aperiodic particle arrays. This constitutes a generalization of this type of phenomenon from periodic to aperiodic structures. As ...
  • Ultraefficient Coupling of a Quantum Emitter to the Tunable Guided Plasmons of a Carbon Nanotube 

    Martín-Moreno, Luis; García de Abajo, Francisco Javier; García-Vidal, Francisco J. (APS, 2015-10-23)
    Article
    Accés obert
    We show that a single quantum emitter can efficiently couple to the tunable plasmons of a highly doped single-wall carbon nanotube (SWCNT). Plasmons in these quasi-one-dimensional carbon structures exhibit deep subwavelength ...
  • Propagation and localization of quantum dot emission along a gap-plasmonic transmission line 

    Castro-Lopez, M.; Manjavacas, A.; García de Abajo, Francisco Javier; Hulst, Niek F. van (OSA, 2015-11-02)
    Article
    Accés obert
    Plasmonic transmission lines have great potential to serve as direct interconnects between nanoscale light spots. The guiding of gap plasmons in the slot between adjacent nanowire pairs provides improved propagation of ...
  • Phonon excitation by electron beams in nanographenes 

    Saavedra, J. R. M.; García de Abajo, Francisco Javier (APS, 2015-09-30)
    Article
    Accés obert
    Electron beams have the ability of exciting vibrational modes (phonons) in molecules and nanoclusters, which can be currently probed with atomic spatial resolution through electron energy-loss spectroscopy (EELS). This ...

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