Enhanced RI Sensitivity and SERS Performances of Individual Au Nanobipyramid Dimers

Fu, Tong; Du, Chunling; Chen, Yangxi; Zhang, RuXin; Zhu, Yan; Sun, Lu; Shi, Dan

doi:10.1007/s11468-020-01302-8

Cited by 14 publications

(10 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides the size and shape of the nanoparticles, a significant contributor is the field enhancement and localization due to interparticle plasmonic coupling [ 31 , 32 ]. It was previously shown that decreasing the interparticle gap (and thus increasing the coupling between nanoparticles) leads to an increased bulk refractive index sensitivity [ 33 , 34 , 35 , 36 ]. More importantly, it was demonstrated that coupling focuses the field in the interparticle gap, thus effectively decreasing the plasmon decay length [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Bonyár

2021

Biosensors

View full text Add to dashboard Cite

The bulk and surface refractive index sensitivities of LSPR biosensors, consisting of coupled plasmonic nanosphere and nano-ellipsoid dimers, were investigated by simulations using the boundary element method (BEM). The enhancement factor, defined as the ratio of plasmon extinction peak shift of multi-particle and single-particle arrangements caused by changes in the refractive index of the environment, was used to quantify the effect of coupling on the increased sensitivity of the dimers. The bulk refractive index sensitivity (RIS) was obtained by changing the dielectric medium surrounding the nanoparticles, while the surface sensitivity was modeled by depositing dielectric layers on the nanoparticle in an increasing thickness. The results show that by optimizing the interparticle gaps for a given layer thickness, up to ~80% of the optical response range of the nanoparticles can be utilized by confining the plasmon field between the particles, which translates into an enhancement of ~3–4 times compared to uncoupled, single particles with the same shape and size. The results also show that in these cases, the surface sensitivity enhancement is significantly higher than the bulk RI sensitivity enhancement (e.g., 3.2 times vs. 1.8 times for nanospheres with a 70 nm diameter), and thus the sensors’ response for molecular interactions is higher than their RIS would indicate. These results underline the importance of plasmonic coupling in the optimization of nanoparticle arrangements for biosensor applications. The interparticle gap should be tailored with respect to the size of the used receptor/target molecules to maximize the molecular sensitivity, and the presented methodology can effectively aid the optimization of fabrication technologies.

show abstract

Section: Introductionmentioning

confidence: 99%

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Bonyár

2021

Biosensors

View full text Add to dashboard Cite

show abstract

“…37 Amin et al used these structures for detecting drug additives such as thiram and bisphenol-S. 38 Very recently, Dong et al assembled Au NBPs into chiral plasmonic nanostructures using DNA origami demonstrating their superior chiroptical response. 39 These new structures have been used for achieving a high photothermal response 40 and refractive index sensitivity 41 and have been used as outstanding SERS substrates. 42,43 In this study, we demonstrate for the first time the design of gold bipyramid monomer and dimer structures with precise nanogaps assembled on a rectangular DNA origami template.…”

Section: Introductionmentioning

confidence: 99%

Selective recognition of the amyloid marker single thioflavin T using DNA origami-based gold nanobipyramid nanoantennas

Sen¹,

Kaur²,

Kaur³

et al. 2023

Nanoscale

View full text Add to dashboard Cite

show abstract

“…Gold nanobipyramids (AuNBPs) with two sharp ends bring much larger local field enhancement, as well as larger optical cross sections, narrower line widths, and higher refractive index sensitivity. − The longitudinal plasmon wavelength of AuNBPs is approximately proportional to the aspect ratio and can be synthetically expanded to wide excitation waveband to fit various scenarios. These inherent properties make AuNBPs a great candidate for spectroscopy, photocatalysis, and biomedical technologies. − On the contrary, it is worth noting that the bare Si modulator is often frequency independent with fixed functionality. Metamaterials through flexible geometrical design can achieve different resonant modes and spectral lineshapes to provide a method to manipulate the THz wave as the multifunctional modulators, which are also sensitive to the external field. , Additionally, the LSPR enhancement of AuNBPs is closely related to surface conditions involving the surface morphology and dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Modulation Enhancement in All-Optical Si-Based THz Modulators Integrated with Gold Nanobipyramids

et al. 2022

View full text Add to dashboard Cite

Optical regulation strategy with the aid of hybrid materials can significantly optimize the performance of terahertz devices. Gold nanobipyramids (AuNBPs) with synthetical tunability to the near-infrared band show strong local field enhancement, which improves optical coupling at the interface and benefits the modulation performance. We design AuNBPs-integrated terahertz modulators with multiple structured surfaces and demonstrate that introducing AuNBPs can effectively enhance their modulation depths. In particular, an ultrahigh modulation enhancement of 1 order of magnitude can be achieved in the AuNBPs hybrid metamaterials accompanied by the multifunctional modulation characteristics. By application of the coupled Lorentz oscillator model, the theoretical calculation suggests that the optical regulation with AuNBPs originates from increased damping rate and higher coupling coefficient under pump excitation. Additionally, a terahertz spatial light modulator is constructed to demonstrate multiple imaging display and consume extremely low power, which is promising for the potential application in spatial and frequency selective imaging.

show abstract

Enhanced RI Sensitivity and SERS Performances of Individual Au Nanobipyramid Dimers

Cited by 14 publications

References 40 publications

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Selective recognition of the amyloid marker single thioflavin T using DNA origami-based gold nanobipyramid nanoantennas

Ultrahigh Modulation Enhancement in All-Optical Si-Based THz Modulators Integrated with Gold Nanobipyramids

Contact Info

Product

Resources

About