Abstract
In this paper, we present an analysis of the resonant response of modified triangular metallic nanoparticles with polynomial sides. The particles are illuminated by an incident plane wave and the method of moments is used to solve numerically the electromagnetic scattering problem. We investigate spectral response and near field distribution in function of the length and polynomial order of the nanoparticles. Our results show that in the analyzed wavelength range (0.5-1.8) µm these particles possess smaller number of resonances and their resonant wavelengths, near field enhancement and field confinement are higher than those of the conventional triangular particle with linear sides.
Highlights
The electromagnetic scattering of metals in optical frequency region possesses special characteristics
We investigate the optical response of the proposed gold nanoparticles and the dependence of this response on the length and polynomial order of the side curves
We show below that in the analyzed wavelength range (0.5-1.8) μm, modified triangular nanoparticles with polynomial sides have smaller number of resonances, longer resonant wavelength, near field enhancement and confinement in comparison with those of the conventional triangular particles with straight sides
Summary
The electromagnetic scattering of metals in optical frequency region possesses special characteristics. We show below that in the analyzed wavelength range (0.5-1.8) μm, modified triangular nanoparticles with polynomial sides have smaller number of resonances, longer resonant wavelength, near field enhancement and confinement in comparison with those of the conventional triangular particles with straight sides. The field enhancement in these figures is defined by (E/E0)2, where E is the total electric field (incident and scattered) near the particle and E0 is the amplitude of the incident plane wave.
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