Numerical study of anomalous TE-polarized light scattering by metallic nanowires using realistic data

2014 ◽  
Vol 23 (01) ◽  
pp. 1450005 ◽  
Author(s):  
G. Wesley Putra Data ◽  
Alexander A. Iskandar ◽  
May-On Tjia
Keyword(s):  
Light Scattering ◽  
Numerical Study ◽  
Polarized Light ◽  
Spectral Width ◽  
Higher Order ◽  
Gold Nanowires ◽  
Higher Order Modes ◽  
Resonance Curves ◽  
Refractive Index Data ◽  
Realistic Data

We report the result of a numerical study of surface plasmon induced anomalous behaviors in TE light scattering by single silver and gold nanowires of radius a. Going beyond the restricted case of nondissipative and nondispersive scatterers often reported previously, the current numerical calculation is performed directly on the basis of Mie's general formula, adopting the refractive index data of Johnson and Christy. Our result does not show the appearance of well resolved and multipole resonances in Q sca plotted against q(= 2πa/λ), for certain wire radii. It does show however, the growing contributions of the higher order modes as a increases. A series of closely-placed but well separated resonance curves nevertheless show up for varying wire radii within the range of small q, exhibiting systematic changes indicative of the size effects on the scattered waves. The further deduced Q sca (λ) spectra display the distinct resonance curves for different wire radii showing peculiar mix of monotonous and nonmonotonous variations of the resonance peak and spectral width with increasing a, as a result of complicated competitions among the growing contributions of the higher order modes. Finally, while the silver and gold scatterers appear to exhibit qualitatively similar behaviors, they differ largely in details due to the significantly different indices of refraction and dispersive properties.

Numerical study of submicroparticle acoustophoresis using higher-order modes in a rectangular microchannel

2018 ◽  
Vol 415 ◽  
pp. 169-183 ◽  
Author(s):  
Jorick van 't Oever ◽  
Jennifer Herek ◽  
Frieder Mugele ◽  
Dirk van den Ende ◽  
Herman L. Offerhaus
Keyword(s):  
Numerical Study ◽  
Higher Order ◽  
Rectangular Microchannel ◽  
Higher Order Modes

scholarly journals Higher-Order Mode Electromagnetic Analysis of a Material Sample between Two Flanged Coaxial Probes for Broadband Modelling of Dielectric Measurement Setups

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Raúl V. Haro-Báez ◽  
Juan Córcoles ◽  
Jorge A. Ruiz-Cruz ◽  
José R. Montejo-Garai ◽  
Jesús M. Rebollar
Keyword(s):  
Numerical Study ◽  
Higher Order ◽  
Dielectric Measurement ◽  
Analysis Method ◽  
Higher Order Modes ◽  
Wall Boundary Conditions ◽  
Wide Range ◽  
Coaxial Probes ◽  
Material Sample

The characterization of the dielectric properties of a material requires a measurement technique and its associated analysis method. In this work, the configuration involving two coaxial probes with a material for dielectric measurement between them is analyzed with a mode-matching approach. To that effect, two models with different complexity and particularities are proposed. It will be shown how convergence is sped up for accurate results by using a proper choice of higher-order modes along with a combination of perfect electric wall and perfect magnetic wall boundary conditions. It will also be shown how the frequency response is affected by the flange mounting size, which can be, rigorously and efficiently, taken into account with the same type of approach. This numerical study is validated through a wide range of simulations with reference values from another method, showing how the proposed approaches can be used for the broadband characterization of this well-known, but with a recent renewed interest from the research community, dielectric measurement setup.

Study of TiN nanodisks with regard to application for Heat-Assisted Magnetic Recording

MRS Advances ◽  
2016 ◽  
Vol 1 (5) ◽  
pp. 317-326 ◽  
Author(s):  
Jacek Gosciniak ◽  
John Justice ◽  
Umar Khan ◽  
Brian Corbett
Keyword(s):  
Titanium Nitride ◽  
Data Storage ◽  
Near Field ◽  
Polarized Light ◽  
Higher Order ◽  
Plasmonic Material ◽  
Order Resonance ◽  
Resonance Modes ◽  
Higher Order Modes ◽  
Transmission Measurements

ABSTRACTIn recent years titanium nitride is being considered as a very promising plasmonic material for data storage applications as it exhibits a pronounced plasmonic dipolar resonance and has high thermal stability. However, there is a lack of research where higher order resonance modes are examined. We address this here by performing angle dependent spectral transmission measurements nanodisks arrays made from titanium nitride. The measurements show strong polarization dependence with s-polarized light causing excitation of the quadrupole and higher order resonance plasmonic modes. These higher order modes are required for the state-of-the-art designs of near-field transducers. This, together with its outstanding thermal properties, makes TiN a favourable material for data storage applications.

scholarly journals Electrical characterisation of higher order spin wave modes in vortex-based magnetic tunnel junctions

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Alex. S. Jenkins ◽  
Lara San Emeterio Alvarez ◽  
Samh Memshawy ◽  
Paolo Bortolotti ◽  
Vincent Cros ◽  
...  
Keyword(s):  
Spin Wave ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Higher Order ◽  
Spin Torque ◽  
Micromagnetic Simulations ◽  
Higher Order Modes ◽  
Spin Diode ◽  
Super High Frequency ◽  
Wave Modes

AbstractNiFe-based vortex spin-torque nano-oscillators (STNO) have been shown to be rich dynamic systems which can operate as efficient frequency generators and detectors, but with a limitation in frequency determined by the gyrotropic frequency, typically sub-GHz. In this report, we present a detailed analysis of the nature of the higher order spin wave modes which exist in the Super High Frequency range (3–30 GHz). This is achieved via micromagnetic simulations and electrical characterisation in magnetic tunnel junctions, both directly via the spin-diode effect and indirectly via the measurement of the coupling with the gyrotropic critical current. The excitation mechanism and spatial profile of the modes are shown to have a complex dependence on the vortex core position. Additionally, the inter-mode coupling between the fundamental gyrotropic mode and the higher order modes is shown to reduce or enhance the effective damping depending upon the sense of propagation of the confined spin wave.

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