scholarly journals Investigation of Tunable Surface Plasmon Resonances on Spheroid Core–Shell Alloy Nanoparticles Using DDA Method

2018 ◽  
Author(s):  
Jing Liu ◽  
Chean Su ◽  
Qiubo Ye ◽  
Wei Chen ◽  
Yushan Chen ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Layer Thickness ◽  
Surface Plasmon ◽  
Shell Thickness ◽  
Core Shell ◽  
Surface Plasmon Resonances ◽  
Shell Nanoparticles ◽  
The Core ◽  
Extinction Spectra ◽  
Plasmon Resonances

In this work, numerical simulations for the absorption and scattering efficiencies of spheroid core–shell nanoparticles (CSNs) were conducted and studied using the discrete-dipole approximation method. The characteristics of surface plasmon resonances (SPR) depend upon shell thickness, the compositions of the core and shell materials, and the aspect ratio of the constructed CSNs. We used different core@shell compositions, specifically Au@SiO2, Ag@SiO2, Au@TiO2, Ag@TiO2, Au@Ag, and Ag@Au, for extinction spectra analysis. We also investigated coupled resonance mode wavelengths by adjusting the composition’s layer thickness and aspect ratio. In this study, we show that the extinction efficiency of the Ag@TiO2 core–shell nanoparticles (CSNPs) was higher than that of the others, and we examined the impact of TiO2 shell thickness and Ag core radius on SPR peak positions. From the extinction spectra we found that the Ag@TiO2 nanoparticle had better refractive index sensitivity and figure of merit when the aspect ratio was set to 0.3. All of the experimental results proved that the tunability of these plasmonic resonances was highly dependent on the material used, the layer thickness, and the aspect ratio of the core@shell CSNPs.

scholarly journals TUNABLE SURFACE PLASMON RESONANCES OF Au@TiO2 CORE-SHELL NANOPARTICLES ON THE DSSC (DYE SENSITIZED SOLAR CELLS) PERFORMANCE

2019 ◽  
Vol 20 (3) ◽  
pp. 106
Author(s):  
Friska Ayu Fitrianti Sugiono ◽  
Doty Dewi Risanti
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Dye Sensitized Solar Cells ◽  
Core Shell ◽  
Surface Plasmon Resonances ◽  
Shell Nanoparticles ◽  
Dye Sensitized ◽  
Plasmon Resonances ◽  
Core Shell Nanoparticles ◽  
Sensitized Solar Cells

Plasmonic core-shell nanoparticles, i.e. gold can improve the efficiency of Dye-sensitized Solar Cell by increase the light harvesting due to the strong near-field effect LSPR (Localized Surface Plasmon Resonance). To achieve maximum enhancement, the morphology of core-shell need to be optimized with coated either by insulator such as semiconductor, i.e. TiO2. In this paper, morphology of Au@TiO2 core-shell precisely control by various TiO2 volume and systematically study its influence on the plasmonic enhancement effect. A gold solution was prepared using Turkevich method. The crystal structure of the powders was determined by powder X-ray diffraction (XRD). The optical properties were measured by UV-Vis absorption spectroscopy using UV-Vis Lambda 750. The photocurrent action spectra or IPCE in visible light spectrum was obtained by adjusting wavelength of incident light, i.e. series connection of halogen lamp and monochromator. UV-Vis absorption spectra of core–shell showed the position of the surface plasmon Au band in the range of 500–550 nm. According to UV-Vis characterization, all samples studied show weak surface plasmon resonance response (~520 to 550 nm) as indicative of the thick TiO2 shells for individual core-shell [email protected] Surface Plasmon Resonances of Au@TiO2 Core-shell Nanoparticles on the DSSC (Dye Sensitized Solar Cells) Performance

Atomistic description of plasmonic generation in alloys and core shell nanoparticles

2021 ◽  
Vol 23 (1) ◽  
pp. 173-185
Author(s):  
Lasse K. Sørensen ◽  
Anton D. Utyushev ◽  
Vadim I. Zakomirnyi ◽  
Hans Ågren
Keyword(s):  
Linear Relationship ◽  
Surface Plasmon ◽  
Core Shell ◽  
Mixing Ratio ◽  
Surface Plasmon Resonances ◽  
Shell Nanoparticles ◽  
Plasmon Resonances ◽  
Non Linear ◽  
Core Shell Nanoparticles

Using the ex-DIM we show and explain why the position of surface plasmon resonances of alloys follow Vegard's linear relationship with the ratio of the constituents and why the polarizability is non-linear with mixing ratio and geometry dependent.

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

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1728
Author(s):  
Joshua Fernandes ◽  
Sangmo Kang
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Aspect Ratio ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Shell Thickness ◽  
Numerical Study ◽  
Field Enhancement ◽  
Core Shell

The near-field enhancement and localized surface plasmon resonance (LSPR) on the core-shell noble metal nanostructure surfaces are widely studied for various biomedical applications. However, the study of the optical properties of new plasmonic non-spherical nanostructures is less explored. This numerical study quantifies the optical properties of spherical and non-spherical (prolate and oblate) dimer nanostructures by introducing finite element modelling in COMSOL Multiphysics. The surface plasmon resonance peaks of gold nanostructures should be understood and controlled for use in biological applications such as photothermal therapy and drug delivery. In this study, we find that non-spherical prolate and oblate gold dimers give excellent tunability in a wide range of biological windows. The electromagnetic field enhancement and surface plasmon resonance peak can be tuned by varying the aspect ratio of non-spherical nanostructures, the refractive index of the surrounding medium, shell thickness, and the distance of separation between nanostructures. The absorption spectra exhibit considerably greater dependency on the aspect ratio and refractive index than the shell thickness and separation distance. These results may be essential for applying the spherical and non-spherical nanostructures to various absorption-based applications.

scholarly journals Tailoring of surface plasmon resonances in TiN/(Al0.72Sc0.28)N multilayers by dielectric layer thickness variation

2017 ◽  
Vol 53 (6) ◽  
pp. 4001-4009 ◽  
Author(s):  
Magnus Garbrecht ◽  
Lars Hultman ◽  
Mohammed H. Fawey ◽  
Timothy D. Sands ◽  
Bivas Saha
Keyword(s):  
Layer Thickness ◽  
Surface Plasmon ◽  
Dielectric Layer ◽  
Thickness Variation ◽  
Surface Plasmon Resonances ◽  
Plasmon Resonances

scholarly journals The effects of bending on plasmonic modes in nanowires and planar structures

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Edson P. Bellido ◽  
Isobel C. Bicket ◽  
Gianluigi A. Botton
Keyword(s):  
Aspect Ratio ◽  
Energy Loss ◽  
Surface Plasmon ◽  
Theoretical Calculations ◽  
Optical Devices ◽  
Surface Plasmon Resonances ◽  
Planar Structures ◽  
Resonant Modes ◽  
Plasmon Resonances ◽  
Electron Energy Loss

Abstract In this work, we investigate the effects of bends on the surface plasmon resonances in nanowires (NWs) and isolated edges of planar structures using electron energy loss spectroscopy experiments and theoretical calculations. Previous work showed that the sharp bends in NWs do not affect their resonant modes. Here, we study previously overlooked effects and analyze systematically the evolution of resonant modes for several bending angles from 30° to 180°, showing that bending can have a significant effect on the plasmonic response of a nanostructure. In NWs, the modes can experience significant energy shifts that depend on the aspect ratio of the NW and can cause mode intersection and antinode bunching. We establish the relation between NW modes and edge modes and show that bending can even induce antinode splitting in edge modes. This work demonstrates that bends in plasmonic planar nanostructures can have a profound effect on their optical response and this must be accounted for in the design of optical devices.

Study of Surface Plasmon Resonances of Core-Shell Nanosphere: A Comparison between Numerical and Analytical Approach

Plasmonics ◽  
2016 ◽  
Vol 12 (4) ◽  
pp. 977-986 ◽  
Author(s):  
Richa Sharma ◽  
Sangita Roopak ◽  
Nilesh kumar Pathak ◽  
Alok ji ◽  
R P Sharma
Keyword(s):  
Surface Plasmon ◽  
Analytical Approach ◽  
Core Shell ◽  
Surface Plasmon Resonances ◽  
Plasmon Resonances
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