Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas

Germann Hergert; Jan Vogelsang; Felix Schwarz; Dong Wang; Heiko Kollmann; Petra Groß; Christoph Lienau; Erich Runge; Peter Schaaf

doi:10.1038/lsa.2017.75

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Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas

Original Articles

- Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas
- Light: Science & Applications Vol. 6, Issue 4, (2017)
- Affiliations：
  
  1.Carl von Ossietzky Universität, Institut für Physik, Center of Interface Science, D-26129 Oldenburg, Niedersachsen, Germany
  2.Technische Universität Ilmenau, Institut für Physik and Institut für Mikro- und Nanotechnologien MacroNano®, D-98693 Ilmenau, Thüringen, Germany
  3.Technische Universität Ilmenau, Institut für Mikro- und Nanotechnologien MacroNano® and Institut für Werkstofftechnik, Fachgebiet Werkstoffe der Elektrotechnik, D-98693 Ilmenau, Thüringen, Germany
  4.Forschungszentrum Neurosensorik, Carl von Ossietzky Universität, D-26111 Oldenburg, Niedersachsen, Germany
- Author bio：
  
  C Lienau, Email: christoph.lienau@uni-oldenburg.de
- Funds：
- DOI：10.1038/lsa.2017.75
  CLC：
- Published：2017-12，
  
  Published Online：03 May 2017，
  
  Received：09 December 2016，
  
  Revised：26 April 2017，
  
  Accepted：01 May 2017
- Accepted：
Scan QR Code
Hergert, G. et al. Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas. Light: Science & Applications, 6, e17075 (2017).
DOI：

Hergert, G. et al. Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas. Light: Science & Applications, 6, e17075 (2017). DOI： 10.1038/lsa.2017.75.

摘要

Abstract

We report long-lived

highly spatially localized plasmon states on the surface of nanoporous gold nanoparticles—nanosponges—with high excitation efficiency. It is well known that disorder on the nanometer scale

particularly in two-dimensional systems

can lead to plasmon localization and large field enhancements

which can

in turn

be used to enhance nonlinear optical effects and to study and exploit quantum optical processes. Here

we introduce promising

three-dimensional model systems for light capture and plasmon localization as gold nanosponges that are formed by the dewetting of gold/silver bilayers and dealloying. We study light-induced electron emission from single nanosponges

a nonlinear process with exponents of

≈5...7

using ultrashort laser pulse excitation to achieve femtosecond time resolution. The long-lived electron emission process proves

in combination with optical extinction measurements and finite-difference time-domain calculations

the existence of localized modes with lifetimes of more than 20 fs. These electrons couple efficiently to the dipole antenna mode of each individual nanosponge

which in turn couples to the far-field. Thus

individual gold nanosponges are cheap and robust disordered nanoantennas with strong local resonances

and an ensemble of nanosponges constitutes a

meta material with a strong polarization independent

nonlinear response over a wide frequency range.

关键词

Keywords

disorder-induced plasmon localizationnanoantennasnanoporous gold nanoparticlesultrafast photoemission spectroscopy

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