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.

Toward 10 meV Electron Energy-Loss Spectroscopy Resolution for Plasmonics

2014 ◽  
Vol 20 (3) ◽  
pp. 767-778 ◽  
Author(s):  
Edson P. Bellido ◽  
David Rossouw ◽  
Gianluigi A. Botton
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Surface Plasmon ◽  
Energy Resolution ◽  
Electron Energy Loss Spectroscopy ◽  
High Energy ◽  
High Energy Resolution ◽  
Surface Plasmon Resonances ◽  
Plasmon Resonances ◽  
Electron Energy Loss

AbstractEnergy resolution is one of the most important parameters in electron energy-loss spectroscopy. This is especially true for measurement of surface plasmon resonances, where high-energy resolution is crucial for resolving individual resonance peaks, in particular close to the zero-loss peak. In this work, we improve the energy resolution of electron energy-loss spectra of surface plasmon resonances, acquired with a monochromated beam in a scanning transmission electron microscope, by the use of the Richardson–Lucy deconvolution algorithm. We test the performance of the algorithm in a simulated spectrum and then apply it to experimental energy-loss spectra of a lithographically patterned silver nanorod. By reduction of the point spread function of the spectrum, we are able to identify low-energy surface plasmon peaks in spectra, more localized features, and higher contrast in surface plasmon energy-filtered maps. Thanks to the combination of a monochromated beam and the Richardson–Lucy algorithm, we improve the effective resolution down to 30 meV, and evidence of success up to 10 meV resolution for losses below 1 eV. We also propose, implement, and test two methods to limit the number of iterations in the algorithm. The first method is based on noise measurement and analysis, while in the second we monitor the change of slope in the deconvolved spectrum.

scholarly journals Investigation of Surface Plasmon Resonances in Silver Infiltrated Metalattices by Monochromated Electron Energy Loss Spectroscopy

2018 ◽  
Vol 24 (S1) ◽  
pp. 432-433 ◽  
Author(s):  
Parivash Moradifar ◽  
Yunzhi Liu ◽  
Jennifer L. Russell ◽  
Thomas E. Mallouk ◽  
John Badding ◽  
...  
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Surface Plasmon ◽  
Electron Energy Loss Spectroscopy ◽  
Surface Plasmon Resonances ◽  
Plasmon Resonances ◽  
Electron Energy Loss

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 Tuning the Fano Resonance Between Localized and Propagating Surface Plasmon Resonances for Refractive Index Sensing Applications

Plasmonics ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 1379-1385 ◽  
Author(s):  
Kristof Lodewijks ◽  
Jef Ryken ◽  
Willem Van Roy ◽  
Gustaaf Borghs ◽  
Liesbet Lagae ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Fano Resonance ◽  
Surface Plasmon Resonances ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Plasmon Resonances
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