Doped Silicon Nanocrystal Plasmonics

Hui Zhang, Runmin Zhang, Katelyn S. Schramke, Nicholas M. Bedford, Katharine Hunter, Uwe R. Kortshagen, Peter Nordlander

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Doped semiconductor nanocrystals represent an exciting new type of plasmonic material with optical resonances in the infrared. Unlike noble metal nanoparticles, the plasmon resonance can be tuned by altering the doping density. Recently, it has been shown that silicon nanocrystals can be doped using phosphorus and boron resulting in highly tunable infrared plasmon resonances. Due to the band structure of silicon, doping with phosphorus contributes light (transverse) and heavy (longitudinal) electrons, while boron contributes light and heavy holes and one would expect two distinct plasmon branches. Here we develop a classical hybridization theory and a full quantum mechanical TDLDA approach for two-component carrier plasmas and show that the interaction between the two plasmon branches results in strongly hybridized plasmon modes. The antibonding mode where the two components move in phase is bright and depends sensitively on the doping densities. The low energy bonding mode with opposite charge alignment can only be observed in the quantum regime when strong Coulomb screening is present. The theoretical results are in good agreement with the experimental data.

Original languageEnglish (US)
Pages (from-to)963-970
Number of pages8
JournalACS Photonics
Volume4
Issue number4
DOIs
StatePublished - Apr 19 2017

Keywords

  • plasmon hybridization
  • plasmonics
  • quantum dots
  • silicon nanocrystals

How much support was provided by MRSEC?

  • Shared

Reporting period for MRSEC

  • Period 4

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