Influence of the Substrate to the LSP Coupling Wavelength and Strength

Liao, Jiawei; Li, Ji; Zhang, Jin; Gao, Na; Li, Penggang; Huang, Kai; Yu, Edward T.; Kang, Junyong

doi:10.1186/s11671-018-2691-2

Cited by 15 publications

(19 citation statements)

References 46 publications

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“…This effect is stronger for greater contact between the nanoparticle and the substrate. 55,56 Although the effect of the substrate can be an important aspect to consider, its inclusion in the model entails greater consumption…”

Section: Problem Specification and Numerical Methodologymentioning

confidence: 99%

Coupled Plasmon Modes in 2D Gold Nanoparticle Clusters and Their Effect on Local Temperature Control

Borah

Verbruggen

2019

J. Phys. Chem. C

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Assemblies of closely separated gold nanoparticles exhibit a strong collective plasmonic response due to coupling of the plasmon modes of the individual nanostructures. In the context of self-assembly of nanoparticles, closed packed 2D clusters of spherical nanoparticles present an important composite system that promises numerous applications. The present study probes the collective plasmonic characteristics and resulting photothermal behavior of closed packed 2D Au nanoparticle clusters in order to delineate the effects of cluster size, inter-particle distance and particle size. Smaller nanoparticles (20 nm and 40 nm in diameter) that exhibit low individual scattering and high absorption were considered for their relevance to photothermal applications. In contrast to typical literature studies, the present study compares the optical response of clusters of different sizes ranging from a single nanoparticle up to large assemblies of 61 nanoparticles. Increasing the cluster size induces significant changes to the spectral position and optophysical characteristics. Based on the model outcome, an optimal cluster size for maximum absorption per nanoparticle is also determined for enhanced photothermal effects. The effect of particle size and interparticle distance is investigated in order to elucidate the nature of interaction in terms of near-field and farfield coupling. The photothermal effect resulting from absorption is compared for different cluster sizes and inter-particle distances considering a homogeneous water medium. A strong dependence of the steady state temperature of the nanoparticles on the cluster size, particle position in the cluster, incident light polarization and inter-particle distance provides new physical insight in local temperature control of plasmonic nanostructures.

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Section: Problem Specification and Numerical Methodologymentioning

confidence: 99%

Coupled Plasmon Modes in 2D Gold Nanoparticle Clusters and Their Effect on Local Temperature Control

Borah

Verbruggen

2019

J. Phys. Chem. C

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“…We assume that the refractive index of the substrate is the same as that of the surrounding medium, water. Therefore, the reflected light will not be induced at the interface between the medium and the substrate; the optical field is not disturbed by the existence of the substrate [ 37 ]. On the other hand, the existence of the substrate serves as a confinement to support NPs moving on the substrate.…”

Section: Methodsmentioning

confidence: 99%

Spin and Orbital Rotation of Plasmonic Dimer Driven by Circularly Polarized Light

et al. 2018

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The plasmon-enhanced spin and orbital rotation of Au dimer, two optically bound nanoparticles (NPs), induced by a circularly polarized (CP) light (plane wave or Gaussian beam) were studied theoretically. Through the optomechanical performances of optical forces and torques, the longitudinal/transverse spin-orbit coupling (SOC) of twisted electromagnetic fields was investigated. The optical forces show that for the long-range interaction, there exist some stable-equilibrium orbits for rotation, where the stable-equilibrium interparticle distances are nearly the integer multiples of wavelength in medium. In addition, the optical spin torque drives each NP to spin individually. For a plane wave, the helicities of the longitudinal spin and orbital rotation of the coupled NPs are the same at the stable-equilibrium orbit, consistent with the handedness of plane wave. In contrast, for a focused Gaussian beam, the helicity of the orbital rotation of dimer could be opposite to the handedness of the incident light due to the negative optical orbital torque at the stable-equilibrium interparticle distance; additionally, the transverse spin of each NP becomes profound. These results demonstrate that the longitudinal/transverse SOC is significantly induced due to the twisted optical field. For the short-range interaction, the mutual attraction between two NPs is induced, associated with the spinning and spiral trajectory; eventually, the two NPs will collide. The borderline of the interparticle distance between the long-range and short-range interactions is approximately at a half-wavelength in medium.

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“…CEM relies on the charge transfer between chemisorbed species and the metal surface [8] . EM provides the leading contribution (typically by a factor of 10 8 ) for the SERS enhancement, which generally originates from the magnification of the electric field by the excitation of LSPs of the underlying SERS active material [9] . One of the strategies is to improve the EM enhancement further by increasing the coupling with the LSPs.…”

Section: Introductionmentioning

confidence: 99%

“…Theory predicts that the LSP coupling strongly depends on the separation distance between the nanoparticles (NPs), which have been confirmed experimentally. Thus, controlling the distance is a promising avenue to improve the SERS enhancement factor [9,10] . It has been observed that the EM enhancement can be drastically increased with the decrease of the separation distance between NPs [9,10] .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, controlling the distance is a promising avenue to improve the SERS enhancement factor [9,10] . It has been observed that the EM enhancement can be drastically increased with the decrease of the separation distance between NPs [9,10] . Therefore, controlling the separation distance to sub-nanometre scales precisely is a promising approach to further improve the enhancement factor of the SERS.…”

Section: Introductionmentioning

confidence: 99%

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Controlled Electrodeposition of Gold on Graphene: Maximization of the Defect‐Enhanced Raman Scattering Response

Ananthoju

Biroju

Theis

et al. 2019

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Influence of the Substrate to the LSP Coupling Wavelength and Strength

Cited by 15 publications

References 46 publications

Coupled Plasmon Modes in 2D Gold Nanoparticle Clusters and Their Effect on Local Temperature Control

Coupled Plasmon Modes in 2D Gold Nanoparticle Clusters and Their Effect on Local Temperature Control

Spin and Orbital Rotation of Plasmonic Dimer Driven by Circularly Polarized Light

Controlled Electrodeposition of Gold on Graphene: Maximization of the Defect‐Enhanced Raman Scattering Response

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