Nanophotonics theory

Enviaments recents

  • Electron diffraction by vacuum fluctuations 

    Giulio, Valerio Di; García de Abajo, Francisco Javier (IOP, 2020-10-29)
    Article
    Accés obert
    Vacuum fluctuations are known to produce electron diffraction leading to decoherence and self-interference. These effects have so far been studied as either an extension of the Aharonov–Bohm effect in front of a planar ...

  • Nonlinear plasmonic response in atomically thin metal films 

    Rodríguez Echarri, Álvaro; Cox, Joel D.; Iyikanat, Fadil; García de Abajo, Francisco Javier (De Gruyter, 2021-10-15)
    Article
    Accés obert
    Nanoscale nonlinear optics is limited by the inherently weak nonlinear response of conventional materials and the small light–matter interaction volumes available in nanostructures. Plasmonic excitations can alleviate these ...

  • Visible Optical Resonances in Electrically Doped DNA 

    Saavedra, J. R. M.; García de Abajo, Francisco Javier (ACS Publications, 2019-02-25)
    Article
    Accés obert
    Dexoyribonucleic acid (DNA) has recently been identified as a promising material for nanotechnology due to its unique mechanical, electrical, and optical properties. However, optical applications are severely hampered by ...

  • Single-Plasmon Thermo-Optical Switching in Graphene 

    Cox, Joel D.; García de Abajo, Francisco Javier (ACS Publications, 2019-05-22)
    Article
    Accés obert
    While plasmons in noble metal nanostructures enable strong light-matter interactions on commensurate length scales, the overabundance of free electrons in these systems inhibits their tunability by weak external stimuli. ...

  • Nonlinear Graphene Nanoplasmonics 

    Cox, Joel D.; García de Abajo, Francisco Javier (ACS, 2019-08-26)
    Article
    Accés obert
    Nonlinear optics is limited by the weak nonlinear response of available materials, a problem that is generally circumvented by relying on macroscopic structures in which light propagates over many optical cycles, thus ...

  • Nonlinear Interactions between Free Electrons and Nanographenes 

    Cox, Joel D.; García de Abajo, Francisco Javier (ACS, 2020-05-13)
    Article
    Accés obert
    Free electrons act as a source of highly confined, spectrally broad optical fields that are widely used to map photonic modes with nanometer/millielectronvolt space/energy resolution through currently available electron ...

  • Enhancement of nonlinear optical phenomena by localized resonances 

    Rodríguez Echarri, A.; Cox, Joel D.; Yu, Renwen; García de Abajo, Francisco Javier (ACS, 2018-01-20)
    Article
    Accés obert
    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, Francisco Javier (AIP, 2018-01-01)
    Article
    Accés obert
    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, Francisco 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, Francisco Javier (AIP, 2017-10-01)
    Article
    Accés obert
    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 H. L.; Levitov, Leonid S.; García de Abajo, Francisco 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 ...

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