Anomalous spectral correlations between SERS enhancement and far-field optical responses in roughened Au mesoparticles

Huang, Yu; Chen, Yun; Gao, Weixiang; Yang, Zhengxuan; Wang, Lingling

doi:10.1063/1.5030373

Cited by 10 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the calculation of optical properties, full electrodynamics calculations based on the frequency-domain COMSOL finite element method (FEM) are performed [34][35][36]. Figure 1(a) shows a schematic diagram of the considered PSC model.…”

Section: Methods and Modelingmentioning

confidence: 99%

Anomalous effects of dielectric coated plasmonic metal nanoparticles on solar absorption enhancement in perovskite thin films

Shen¹,

Deng²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

Localized surface plasmon resonances in metallic nanostructures have been extensively harnessed for light absorption enhancement in various solar cells, including perovskite solar cells (PSCs). For stabilization and functionalization, plasmonic metal nanostructures are often coated with dielectric shells. In this work, we numerically investigate the effects of dielectric coated plasmonic metal nanoparticles (NPs) on solar absorption enhancement in perovskite thin films. To our surprise, a further absorption enhancement compared with the films embedding bare Ag NPs can be achieved when using thin dielectric coating of high refractive index, while an absorption reduction in comparison with bare perovskite thin films may take place when the embedded Ag NPs are coated with thick dielectric shells of low refractive index. The physics behind is addressed within classic electrodynamics. These anomalous effects extend our knowledge of PSCs, providing guidelines for optimized design of plasmonic solar cells.

show abstract

Section: Methods and Modelingmentioning

confidence: 99%

Anomalous effects of dielectric coated plasmonic metal nanoparticles on solar absorption enhancement in perovskite thin films

Shen¹,

Deng²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is now fully appreciated in plasmonics that the localized near-field optical response is intrinsically redshifted relative to the radiated far-field one. [56,57] The shift can be hundreds of nanometers for large particles, but it may decrease in the case of strong near-field coupling. [57][58][59][60] Basically, this phenomenon is associated with the damping of the system, which can be intuitively understood in analogy with classically driven damped harmonic oscillators in mechnanics.…”

Section: Redshift Between Absorption and Scattering Peaksmentioning

confidence: 99%

“…[56,57] The shift can be hundreds of nanometers for large particles, but it may decrease in the case of strong near-field coupling. [57][58][59][60] Basically, this phenomenon is associated with the damping of the system, which can be intuitively understood in analogy with classically driven damped harmonic oscillators in mechnanics. [61] The total damping is a sum of the intrinsic damping of the materials and the radiative damping which increases with the size of the whole hybrid NP.…”

Section: Redshift Between Absorption and Scattering Peaksmentioning

confidence: 99%

Mie‐Resonance‐Enhanced Visible Light Absorption in Dielectric‐Supported Small Pt Nanoparticles for Photocatalysis

Huang

Wang

et al. 2021

Annalen der Physik

Self Cite

View full text Add to dashboard Cite

Strong near‐field coupling between small catalytic Pt nanoparticles (NPs) and their dielectric supports can be achieved while visible light absorption in the Pt NPs is greatly enhanced via rationally designing the dielectric–Pt core–satellite configuration. Herein, it is demonstrated that the absorption enhancement is mediated by the Mie resonances of the support and the absorption peaks are induced by the magnetic Mie resonances. Utilizing both multipole decomposition analysis and numerical near‐field mapping, resonances including magnetic dipole, magnetic quadrupole, and higher modes are verified. For the generation of strong Mie resonances, a dielectric support with a high refractive index, like TiO2, can be used not only as the core directly, but also as a shell coated beneath or above the Pt NP layer. Additionally, the redshifts between the absorption peaks contributed by the Pt NPs and the scattering peaks contributed by the dielectric core are ascribed to the intrinsical spectral deviation between near‐ and far‐field optical properties. These findings benefit significantly both the fundamental understanding and optimized design of dielectric supported Pt photocatalysts, providing new opportunities for solar energy conversion and visible light photocatalysis using nonplasmonic catalytic transition metals.

show abstract

“…The nearfield resonance peak is usually more or less redshifted compared to the far field resonance peak [34,35]. Here, to collect the nearfield spectral characteristics, a selfdefined averaged nearfield enhancement factor EF is taken as the spatial average of EF = |E| 4 /|E 0 | 4 [36][37][38]:…”

Section: Computational Modeling and Theorymentioning

confidence: 99%

Reducing the loss of electric field enhancement for plasmonic core–shell nanoparticle dimers by high refractive index dielectric coating

Zhai

Deng

Chen

et al. 2019

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

Plasmonic nanoparticle (NP) dimers, generating highly intense areas of electric field enhancement named hot spots, have been playing a vital role in various applications like surface enhanced Raman scattering. For stabilization and functionalization, such metallic NPs are often coated with dielectric shells, yet suffer from a rapid degeneration of the hot spot with the increase of the shell thickness. Herein, it is demonstrated that the use of appropriately high refractive dielectric coatings can greatly reduce the loss of local electric field enhancement, maintaining usable hot spots. Two mechianisms work synergistically. Firstly, the high refractive index dielectric coating enables a great leap of the local electric fields reaching the gap, which follows the boundary conditions at the interface within electrodynamics. Secondly, owing to its strong Mie resonances that can participate in the plasmon hybridization, the high refractive index dielectric coating contributes to a strong light coupling effect in terms of improving the light absorption. Taking advantage of the proposed physical process decomposition, both the resonance shift and local electric field enhancement can be elaborated. These findings should be of significant importance in extended applications of surface enhanced spectroscopies and related plasmonic devices based on hot spots.

show abstract

Anomalous spectral correlations between SERS enhancement and far-field optical responses in roughened Au mesoparticles

Cited by 10 publications

References 29 publications

Anomalous effects of dielectric coated plasmonic metal nanoparticles on solar absorption enhancement in perovskite thin films

Anomalous effects of dielectric coated plasmonic metal nanoparticles on solar absorption enhancement in perovskite thin films

Mie‐Resonance‐Enhanced Visible Light Absorption in Dielectric‐Supported Small Pt Nanoparticles for Photocatalysis

Reducing the loss of electric field enhancement for plasmonic core–shell nanoparticle dimers by high refractive index dielectric coating

Contact Info

Product

Resources

About