Optimization of the Field Enhancement and Spectral Bandwidth of Single and Coupled Bimetal Core-Shell Nanoparticles for Few-Cycle Laser Applications

Ying Ying Yang, Edit Csapó, Yong Liang Zhang, Frederik Süßmann, Sarah L. Stebbings, Xuan Ming Duan, Zhen Sheng Zhao, Imre Dékány, Matthias F. Kling

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We have theoretically studied and optimized the field enhancement and temporal response of single and coupled bimetal Ag/Au core-shell nanoparticles (NPs) with a diameter of 160 nm and compared the results to pure Ag and Au NPs. Very high-field enhancements with an amplitude reaching 100 (with respect to the laser field centered at 800 nm) are found at the center of a 2-nm gap between Ag/Au core-shell dimers. We have explored the excitation of the bimetal core-shell particles by Fourier transform-limited few-cycle optical pulses and identified conditions for an ultrafast plasmonic decay on the order of the excitation pulse duration. The high-field enhancement and ultrafast decay makes bimetal core-shell particles interesting candidates for applications such as the generation of ultrashort extreme ultraviolet radiation pulses via nanoplasmonic field enhancement. Moreover, in first experimental studies, we synthesized small bimetal Ag/Au core-shell NPs and compared their optical response with pure Au and Ag NPs and numerical results.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalPlasmonics
Volume7
Issue number1
DOIs
Publication statusPublished - Mar 1 2012

Keywords

  • Core-shell nanoparticles
  • Few-cycle laser pulses
  • Nanoparticle synthesis
  • Nanoplasmonic field enhancement
  • Plasmonic absorption spectra

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biochemistry

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