scholarly journals Coupled dipole approximation across the Γ-point in a finite-sized nanoparticle array

2017 ◽  
Vol 375 (2090) ◽  
pp. 20160316 ◽  
Author(s):  
J.-P. Martikainen ◽  
A. J. Moilanen ◽  
P. Törmä
Keyword(s):  
Real Space ◽  
Dipole Approximation ◽  
Incident Field ◽  
Nanoparticle Array ◽  
Radiation Patterns ◽  
New Horizons ◽  
Coupled Dipole Approximation

We study the response of a finite-sized nanoparticle array to an incident field in the vicinity of the Γ-point of the lattice. Using the coupled dipole approximation, we find that the dipole distributions can be strongly inhomogeneous and that strong modulations appear as the energy is above the Γ-point. We highlight how this is reflected in real-space extinction efficiencies as well as in radiation patterns from the finite-sized array. This article is part of the themed issue ‘New horizons for nanophotonics’.

RHOMBIC SILVER NANOPARTICLES ARRAY-BASED PLASMONIC FILTER

2011 ◽  
Vol 25 (19) ◽  
pp. 2557-2566 ◽  
Author(s):  
YONGQI FU ◽  
SHAOLI ZHU ◽  
XIULI ZHOU ◽  
WEI ZHOU ◽  
WEI ZHAO
Keyword(s):  
Filter Design ◽  
Extinction Spectrum ◽  
Dipole Approximation ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Theoretical Spectrum ◽  
Nanoparticle Array ◽  
Ag Nanoparticle ◽  
Design And Optimization ◽  
Plasmonic Filter

A plasmonic filter applied in visible regime is proposed. A method using discrete dipole approximation (DDA) to aid design parameters of rhombic Ag nanoparticle array is adopted for the filter design and optimization on the basis of computational numerical calculation. Influence of the particle parameters such as thickness, period and effective index of medium around the particles on the extinction spectrum is studied using the DDA-based computational analysis. The calculation results show that the thickness ranging from 35 to 45 nm and the period ranging from 350 to 560 nm are the better geometrical parameters of the rhombic Ag nanoparticle array. Considering the nano-fabrication condition, 40 nm thickness and 440 nm period were selected and fabricated using nanosphere lithography (NSL) technique. The experimental results demonstrated that the measured spectrum is basically in agreement with the theoretical spectrum derived by the DDA calculation.

Coupled-dipole approximation: predicting scattering by nonspherical marine organisms

1991 ◽  
Author(s):  
Patricia G. Hull ◽  
Arlon J. Hunt ◽  
Mary S. Quinby-Hunt ◽  
Daniel B. Shapiro
Keyword(s):  
Dipole Approximation ◽  
Marine Organisms ◽  
Coupled Dipole Approximation

A Study of Spin and Orbital Magnetic Form Factors of CeRh3B2 by X-Ray Magnetic Diffraction

2011 ◽  
Vol 497 ◽  
pp. 3-7 ◽  
Author(s):  
Masahisa Ito ◽  
Ryota Nagayasu ◽  
Tatsuki Tadenuma ◽  
Kosuke Suzuki ◽  
Ayako Sato ◽  
...  
Keyword(s):  
Form Factor ◽  
Form Factors ◽  
Real Space ◽  
Dipole Approximation ◽  
Magnetic Form Factor ◽  
Rare Earth Compound ◽  
X Ray ◽  
Curve Fitting Analysis ◽  
Magnetic Form Factors ◽  
First Time

An experimental method of X-ray magnetic diffraction was applied to the ferromagnetic rare-earth compound CeRh3B2, and its spin and orbital magnetic form factors were measured independently for the first time. Our curve-fitting analysis shows that the orbital magnetic form factor is reproduced by the calculated atomic-model form factor of Ce-4f electrons under the dipole approximation. The comparison of the sum of form factors and the total magnetic form factor measured by the polarized neutron diffraction reveals anisotropic distribution of the magnetic moment in real space.

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