In:
Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 35, No. 22 ( 2021-08-10), p. 2150378-
Abstract:
Heterogeneous dimers of Au and Si nanoparticles are expected to exhibit different plasmon properties from that of homogeneous noble metal nanoparticle dimers. It is crucial to unveil the potential applications in surface-enhanced Raman scattering (SERS) and refractive-index (RI) sensing of the prototype dimer of Au and Si nanospheres. The near-field coupling between the two components within the dimer is revealed to not affect the resonance energy of Si mode in the extinction spectra, but decrease that of Au mode. It also accounts for the plasmon ruler behavior of the fractional shifts of both its dipolar peak wavelength of localized surface plasmon resonance (LSPR) and corresponding RI sensitivity factor [Formula: see text], which provide another kind of substitute to estimate the gap distance in between components within the dimer as that of noble metal nanoparticle dimers. Additionally, by tracking the inflection point shift of the corresponding extinction spectra, its [Formula: see text] is revealed to improve 36% than that of traditional one. The maximum [Formula: see text] and SERS enhancement factor [Formula: see text] at 2 nm gap distance are demonstrated to reach 336 nm RIU[Formula: see text] and [Formula: see text] , respectively. This work paves a new way for developing efficient SERS and RI sensing substrates by combining noble metal and dielectric nanoparticles.
Type of Medium:
Online Resource
ISSN:
0217-9849
,
1793-6640
DOI:
10.1142/S0217984921503784
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2021
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