Examining Substrate-Induced Plasmon Mode Splitting and Localization in Truncated Silver Nanospheres with Electron Energy Loss Spectroscopy.
Motivated by the need to study the size dependence of nanoparticle-substrate systems, we present a combined experimental and theoretical electron energy loss spectroscopy (EELS) study of the plasmonic spectrum of substrate-supported truncated silver nanospheres. This work spans the entire classical range of plasmonic behavior probing particles of 20-1000 nm in diameter, allowing us to map the evolution of localized surface plasmons into surface plasmon polaritons and study the size dependence of substrate-induced mode splitting. This work constitutes the first nanoscopic characterization and imaging of these effects in truncated nanospheres, setting the stage for the systematic study of plasmon-mediated energy transfer in nanoparticle-substrate systems.
†Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.
Guoliang
G
Li
‡Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
Charles
C
Cherqui
§Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.
Yueying
Y
Wu
‡Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
Nicholas W
NW
Bigelow
∥Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.
Philip D
PD
Simmons
§Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.|⊥Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Philip D
PD
Rack
‡Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
David J
DJ
Masiello
†Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.
Jon P
JP
Camden
Plasmonics; STEM/EELS; dewetting; quasiplanar; silver nanosphere