Photoemission enhancement induced by near-fields via local surface plasmon resonance of silver nanoparticles on a hydrogen-terminated Si(111) surface

Tsuneyuki Nakamura, Naoyuki Hirata, Yuji Sekino, Shuhei Nagaoka, Atsushi Nakajima

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The photoemission enhancement with local surface plasmon resonance (LSPR) was studied by two-photon photoemission (2PPE) spectroscopy for size-selected silver (Ag) and gold (Au) metal nanoparticles (NPs) deposited on a hydrogen-terminated Si(111)-(1 × 1) [H-Si(111)] surface. At 0.0015 monolayer equivalents (MLE) of Ag NPs, the photoemission enhancement was observed at a photon energy of 3.10 eV, which corresponds to the peak energy for the LSPR of isolated Ag NPs. A surface with around 0.005 MLE LSPR of size-selected Ag NPs exhibited three- and four-photon photoemission processes, implying monodispersed Ag NPs on H-Si(111). This enhancement could not be observed for Au NP deposition, even at 1.0 MLE in the photon energy range of 2.90-3.23 eV. Taking into account the polarization and photoemission-angle dependences, the photoemission enhancement could be accounted for by a mechanism involving the near-fields induced by the LSPR of Ag NPs. This mechanism is consistent with an analysis based on the effect of the interparticle distance between Ag NPs on the near-field intensity and polarization.

Original languageEnglish
Pages (from-to)16270-16277
Number of pages8
JournalJournal of Physical Chemistry C
Volume114
Issue number39
DOIs
Publication statusPublished - 2010 Oct 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Photoemission enhancement induced by near-fields via local surface plasmon resonance of silver nanoparticles on a hydrogen-terminated Si(111) surface'. Together they form a unique fingerprint.

  • Cite this