Numerical Study on the Surface Plasmon Resonance Tunability of Spherical and Non-Spherical Core-Shell Dimer Nanostructures

Fernandes, Joshua; Kang, Sangmo

doi:10.3390/nano11071728

Cited by 10 publications

(10 citation statements)

References 63 publications

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“…A previous study by Jain et al 60 showed that the spectral position of the absorption efficiency is strongly dependent on the total radius and core-to-shell ratio of the nanostructure. This observation is further supported by our previously reported numerical model, 61 where we investigated the plasmonic properties of core−shell gold nanodimers with varying shell thicknesses. Here we study the influence of the gold shell thickness (t Au ) on the temperature and flow velocity around the core−shell gold nanodimers.…”

Section: Numerical Validationsupporting

confidence: 83%

Thermal-Induced Convective Flow around Core–Shell Gold Nanodimers under Continuous-Wave Laser Irradiation: Implications for Nanofluidics

Fernandes,

Kang

2023

ACS Appl. Nano Mater.

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The study of heat transfer and fluid flow around gold nanostructures under laser irradiation is critical for advancements in targeted drug delivery and photothermal therapy within the field of nanofluidics. However, previous theoretical studies have predicted only nanometers-per-second flow velocities, which need to be improved for microscale mass transport. Our numerical approach investigates the thermal-induced convective flow around core–shell gold nanodimers, including nanoshells and nanorods, under continuous-wave laser irradiation using finite element modeling in the COMSOL Multiphysics package. We integrate electromagnetic, thermal, and fluid flow multiphysics simulations to quantify time-varying temperature and convective flow fields. Our study reveals that nanodimers on a substrate can generate convective flow with a velocity in the micrometers-per-second range, which is significantly higher than previous predictions. Moreover, our investigation demonstrates that thinning the metal shell in the core–shell nanodimers significantly enhances their thermofluidic response, resulting in higher temperature and flow velocity than their solid counterparts. Additionally, we report on the effects of geometrical parameters on the thermofluidic response. Our findings have significant implications for the synthesis of plasmonic nanostructures using gold as an optimized shell material for specific applications such as drug delivery. The present research not only advances our understanding of thermal-induced convective flow around gold nanodimers but also provides a robust foundation for enhancing the functionality of these nanostructures for targeted bioapplications like optical trapping in nanofluidic systems.

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Section: Numerical Validationsupporting

confidence: 83%

Thermal-Induced Convective Flow around Core–Shell Gold Nanodimers under Continuous-Wave Laser Irradiation: Implications for Nanofluidics

Fernandes,

Kang

2023

ACS Appl. Nano Mater.

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“…This was implemented using the software package COMSOL multiphysics which is extensively applied to several types of plasmonic devices. 46,47 We first verified good qualitative and quantitative agreement with simulations reported in previous works, 19,21 that were obtained via the discrete dipole approximation method as implemented in the DDSCAT library. 43…”

Section: Definition and Modeling Of Covered Gold-nanorod-dimer Nanoan...supporting

confidence: 77%

Effect of the excitation setup in the improved enhancement factor of covered-gold-nanorod-dimer antennas

Ramos

Hilario

Pedano

et al. 2022

Phys. Chem. Chem. Phys.

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“…The enhancement factor follows from post-processing the local electric field within the gap obtained from full wave simulations having the sample subject to the desired excitation at a fixed wavelength, i.e., in the frequency domain. This was implemented using the software package COMSOL multiphysics which is extensively applied to several types of plasmonic devices [44,45]. We first verified good qualitative and quantitative agreement with simulations reported in previous works [19,21], that were obtained via the discrete dipole approximation method as implemented in the DDSCAT library [41].…”

Section: Enhancement Factor and Surface Charge Densitiessupporting

confidence: 68%

Effect of the excitation setup in the improved enhancement factor of covered-gold-nanorod-dimer antennas

Ramos,

Hilario,

Pedano

et al. 2023

Preprint

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Devices possessing the ability to sense both electrically and optically molecular targets are of fundamental and technological interest. Towards this end, it has been shown that covering the ends of gapped gold-nanorod-dimer nanoantennas can improve the enhancement factor (EF) that quantifies the nanoantenna efficiency for surface-enhancement Raman spectroscopy (SERS) for an incident wave coming from the top of the sample. Here, as the covering breaks the top-bottom symmetry, we investigate the behavior of the EF for excitation coming from the bottom of the sample. This is relevant in presence of a reflecting substrate or due to the placement of the device in a cavity field. We also study the case of a superposition of waves coming from both directions in the limit cases in which a node or an antinode of the total incident field lies at the center of the gold nanorods. In all these situations we find that the EF of the covered device can continue to be higher than for the uncovered case when the geometrical parameters are tuned to the peak values of the calculated enhancement factor.

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Numerical Study on the Surface Plasmon Resonance Tunability of Spherical and Non-Spherical Core-Shell Dimer Nanostructures

Cited by 10 publications

References 63 publications

Thermal-Induced Convective Flow around Core–Shell Gold Nanodimers under Continuous-Wave Laser Irradiation: Implications for Nanofluidics

Thermal-Induced Convective Flow around Core–Shell Gold Nanodimers under Continuous-Wave Laser Irradiation: Implications for Nanofluidics

Effect of the excitation setup in the improved enhancement factor of covered-gold-nanorod-dimer antennas

Effect of the excitation setup in the improved enhancement factor of covered-gold-nanorod-dimer antennas

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