Open AccessReflection of Cylindrical Surface Waves
Author(s) -
Reuven Gordon
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.018621
Subject(s) - optics , reflection (computer programming) , nanorod , materials science , reflection coefficient , wavelength , resonator , plasmon , surface plasmon resonance , terahertz radiation , surface plasmon , surface plasmon polariton , resonance (particle physics) , metamaterial , fabry–pérot interferometer , physics , atomic physics , nanotechnology , computer science , nanoparticle , programming language
The reflection of the radially polarized surface wave on a metal wire at an abrupt end is derived. This theory allows for straightforward calculation of the reflection coefficient, including the phase and the amplitude, which will prove useful to the many applications in nanoplasmonics and terahertz spectroscopy. The theory shows excellent quantitative agreement with past comprehensive numerical simulations for small wires and for predicting the minima in reflection for larger wires. Using this theory, the wavelength dependent reflection is calculated for gold rods of diameter 10 nm, 26 nm and 85 nm, from which the Fabry-Perot resonance wavelengths are found. The Fabry-Perot resonances show good agreement with experimentally measured surface plasmon resonances in nanorods. This demonstrates the predictive ability of the theory for applications involving widely-used nanorods, optical antennas and plasmonic resonators.