Guided Surface Plasmon Mode of Semicircular Cross Section Silver Nanoridges

TL;DR

This paper investigates the properties of tightly confined surface plasmon modes in semicircular cross section silver nanoridges, revealing their superior confinement and propagation characteristics compared to cylindrical nanowires.

Contribution

It provides a detailed analysis of mode profiles, dispersion, and figure-of-merit for semicircular silver nanoridges, highlighting their advantages over cylindrical nanowires.

Findings

Semicircular nanoridges support tightly confined quasi-TEM plasmon modes.

They exhibit longer propagation distances than cylindrical nanowires of the same radius.

They have higher figure-of-merit indicating better performance.

Abstract

Tightly confined plasmon waveguide modes supported by semicircular cross section top silver nanoridges are investigated in this paper. Mode field profiles, dispersion curves, propagation distances, confinement factors, and figure-of-merits of semicircular top silver nanoridge plasmon waveguide mode are calculated for different radii of curvature at different wavelengths. It is found that semicircular top silver nanoridges support tightly confined quasi-TEM plasmon waveguide modes. Semicircular top silver nanoridge mode has longer propagation distance and higher figure-of-merit than that of the cylindrical silver nanowire of the same radius of curvature.