Localization of laser-induced breakdown in aggregates of silver nanoshells

Honoh Suzuki*, Tomoko Koike, Izumi Suzuki, Tokimasa Kawabata, I. Yin Sandy Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Nanoshells are useful in near-infrared (NIR) applications because of the red shift of the Mie resonance into NIR. Silica/gold/silver nanoshells were prepared via gold anchoring and characterized by Mie-theoretical calculations and transmission electron microscopy, which indicated a broad and enhanced NIR absorption and a partially coated, mottled Ag/Au structure on the silica core. The mottled nanoshells were found to spontaneously aggregate in solution to form irregular islands. Their surface roughness was examined by the fractal dimension analysis. When the aggregates were irradiated with 1064-nm laser pulses, highly localized emission due to laser-induced breakdown was observed, which is attributed to the non-uniform metal distribution over the aggregate surface and the localization of the optical field induced by the disordered arrangement of the nanoshells in the aggregate.

Original languageEnglish
Pages (from-to)290-295
Number of pages6
JournalScience and Technology of Advanced Materials
Volume7
Issue number3
DOIs
StatePublished - 2006/04

Keywords

  • Ag nanoshells
  • Laser-induced breakdown
  • Localized emission
  • Mie theory
  • Nanoparticle aggregates

ASJC Scopus subject areas

  • General Materials Science

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