Abstract
Higher order plasmonic resonance modes and their frequency blue shifts in silver-coated silica nanoparticle antennas are studied. Synthesizing them with a wet chemistry method, silica (SiO2) nanoparticles were enclosed within silver shells with different thicknesses. A size-dependent Drude model was used to model the plasmonic shells and their optical losses. Two higher order plasmonic resonances were identified for each case in these simulations. The photoluminescence spectroscopy (PL) experimental results, in good agreement with their simulated values, confirmed the presence of those two higher order resonant modes and their resonance frequencies. When compared with pure metallic Ag nanoparticles, size-induced blue shifts were observed in these resonance frequencies.
Highlights
The word nanoantenna is widely used to denote a scattering device able to localize an optical field into a region smaller than its wavelength [1]
Our experiments have identified a blue shift in the local surface plasmon resonance (LSPR) of the Ag-coated SiO2 nanoparticles
The samples were named as S1, S2, and S3 according to their shell thickness ~14 ± 1 nm, 18 ± 1 nm samples were named as S1, S2, and their shell
Summary
The word nanoantenna is widely used to denote a scattering device able to localize an optical field into a region smaller than its wavelength [1]. Noble metals like silver (Ag) and gold (Au) exhibit LSPR resonances in optical regime They are used in a variety of optoelectronics devices for bio sensing, imaging properties, and surface-enhanced Raman spectroscopy wireless communication [2,3,4,5,6]. This article presents the concept of material quantity based (MQB) and nano size-dependent (NSD) optical losses to explain the frequency blue shift observed in fabricated core–shell The measured data indicates that an increase in the effective dielectric constant of the SiO2 region is not the only feature responsible for the blue shift. Additional size-dependent effects in the nano-regime are necessary to explain the observed blue shifts of the LSPR frequencies. The measured results and their simulated values are in reasonable agreement
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