Manipulating the confinement of electromagnetic field in size-specific gold nanoparticles dimers and trimers

Abstract

Confinement of the electromagnetic field in gold nanoparticle dimers and trimers with variations in the interparticle distances and angles has been calculated.

The Aggregation of Destabilized Ag Triangular Nanoplates and Its Application in Detection of Thiram Residues

“…As shown in Figures 3a, S2 and S3, the extinction peaks of most of the assembled Ag TNPs show a redshift when compared with the monomer Ag TNP. This is consistent with the results of the most common spherical nanoparticles dimer [32]. In detail, the tip-to-tip form shows the biggest red shift followed by the side-to-tip, side-by-side, plane-to-tip,…”

Asymmetric Multipole Plasmon-Mediated Catalysis Shifts the Product Selectivity of CO2 Photoreduction toward C2+ Products

“…We also simulated the behavior of isolated Ag, Cu NPs, as well as Ag–Ag and Cu–Cu homodimers (Figures S4 and S5 in the Supporting Information). At very few spots at the right edge of the Ag NP directly opposite the Cu NP on top of TiO 2 , an absolute local field intensity enhancement factor as high as 90 was obtained due to the well-known electrodynamic coupling of plasmon modes in closely lying metal nanoparticles . Absolute local field intensity enhancement factors of 15 and higher were obtained at a number of spots all along the Ag–TiO 2 interface due to the low loss of Ag and the additional field concentration effect at the high-index interface with TiO 2 nanotubes.…”

“…At very few spots at the right edge of the Ag NP directly opposite the Cu NP on top of TiO 2 , an absolute local field intensity enhancement factor as high as 90 was obtained due to the well-known electrodynamic coupling of plasmon modes in closely lying metal nanoparticles. 52 Absolute local field intensity enhancement factors of 15 and higher were obtained at a number of spots all along the Ag−TiO 2 interface due to the low loss of Ag and the additional field concentration effect at the high-index interface with TiO 2 nanotubes. The electric field profiles were scaled using a jet colormap from dark blue (low field amplitude) to dark red (large field amplitude), respectively.…”

DNA Origami-Templated Bimetallic Nanostar Assemblies for Ultra-Sensitive Detection of Dopamine

“…The complex geometry and angular orientation-dependent hotspot formation in the case of trimer nanostructures create non-uniformity in signal enhancements. In a report, Pal et al systematically investigated the effect of varying the interparticle distances and angular orientations of the size-selective Au NP dimers and trimers when the particle size is very large compared with the interparticle distance ( Pal et al, 2019 ). They revealed that spectral features were very sensitive to the relative orientations and interparticle gap in the trimers, with even minute alterations in angular orientation of trimeric nanostructures altering the direction of light propagation.…”

“…The dimer and trimer nanostructures are the simplest geometries to determine the impact of multiple hotspot formation in coupled plasmonic nanostructures. For example, size-specific gold (Au) nanoparticles ( Pal et al, 2019 ), spherical Au@Ag NPs ( Chen et al, 2010 ), and Au and Ag NPs ( Sergiienko et al, 2017 ) were synthesized to explore the stoichiometry effect on SERS signal enhancement. Various metallic nanostructure-based SERS substrates, such as Au/Ag nanoclusters ( Phung et al, 2018 ), self-assembled Au nanoparticles ( An et al, 2011 ), Ag nanocubes ( Lu et al, 2020 ), worm-like Ag clusters ( Palanisamy et al, 2015 ), and spread spectrum SERS technique ( Lee et al, 2021 ), were developed in the last few years as probes for sensitive dopamine detection.…”