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

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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

Fingerprint

Surface plasmon resonance
Photoemission
Silver
surface plasmon resonance
Hydrogen
near fields
photoelectric emission
silver
Nanoparticles
nanoparticles
augmentation
Photons
hydrogen
Monolayers
photons
Polarization
Metal nanoparticles
Photoelectron spectroscopy
Gold
polarization

ASJC Scopus subject areas

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

Cite this

Photoemission enhancement induced by near-fields via local surface plasmon resonance of silver nanoparticles on a hydrogen-terminated Si(111) surface. / Nakamura, Tsuneyuki; Hirata, Naoyuki; Sekino, Yuji; Nagaoka, Shuhei; Nakajima, Atsushi.

In: Journal of Physical Chemistry C, Vol. 114, No. 39, 07.10.2010, p. 16270-16277.

Research output: Contribution to journalArticle

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