Evolution Towards a New LSPR Particle: Nano-Sinusoid

Abstract

Abstract-This paper proposes a novel nano-sinusoid particle to be employed in enhanced localized surface plasmon resonance (LSPR) bio-sensing devices. Numerical investigations are carried out to demonstrate advantages offered by the proposed nano-particle on LSPR enhancement over other nano-particles including noble nanotriangles and nano-diamonds. Although nano-triangles exhibit high concentration of the electric field near their tips, when illuminated with a light polarized along the tip axis, they present only one hot spot at the vertex along the polarization direction. To create a structure with two hot spots, which is desired in bio-sensing applications, two nano-triangles can be put back-to-back. Therefore, a nano-diamond particle is obtained which exhibits two hot spots and presents higher enhancements than nano-triangles for the same resonant wavelength. The main drawback of the nano-diamonds is the fluctuation in their physical size-plasmon spectrum relationships, due to a high level of singularity as the result of their four sharp tip points. The proposed nano-sinusoid overcomes this disadvantage while maintaining the benefits of having two hot spots and high enhancements.

Epsilon-Near-Zero Nanoantennas

“…Metamaterial structures are an emerging opportunity for novel optical tools. Typically, metamaterialbased antennas have been designed by using double-negative (DNG) [7], negative permittivity (ENG) [8], negative permeability (MNG) [9,10] materials, and nanostructures [11,12]. Recently, several studies focused their attention on a particular kind of metamaterials entitled epsilon-near-zero (ENZ) and on their particular electromagnetic properties [13].…”