Junctions between two-dimensional plasmonic waveguides in the presence of retardation
File(s)
Accepted version
Author(s)
Siaber, Serhii
Zonetti, Simone
Sydoruk, Oleksiy
Type
Journal Article
Abstract
Plasmons in two-dimensional waveguides are traditionally analysed within the electrostatic approximation, which assumes that the plasmon phase velocity is much smaller than the velocity of light. However, novel effects have recently been demonstrated for plasmons whose velocity is comparable to the velocity of light. In this retardation regime, electrostatic models are inaccurate. For a junction between two plasmonic waveguides, we present an analytical and a numerical model both valid in the retardation regime and compare them to an electrostatic model. We quantify the reflected and transmitted powers and the radiation loss in several scenarios. We found that power is radiated from a junction at the expense of the power of the reflected plasmon, but retardation has little effect on the phases of the reflected and transmitted plasmons. The radiation loss is typically below several percent when the plasmon velocities are five or more times below the light velocity. However, radiation still persists for slower plasmon velocities for a junction between a two-dimensional waveguide and a perfectly conducting sheet. As a result, retardation is expected to degrade the quality factors of plasmonic resonators without affecting their eigenfrequencies.
Date Issued
2019-09-16
Date Acceptance
2019-09-02
Citation
Journal of Optics, 2019, 21 (10)
ISSN
2040-8978
Publisher
IOP Publishing
Journal / Book Title
Journal of Optics
Volume
21
Issue
10
Copyright Statement
© 2019 IOP Publishing Ltd. As the Version of Record of this article is going to be/has been published on a subscription basis ( S Siaber et al 2019 J. Opt. 21 105002 ), this Accepted Manuscript will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period. Although reasonable endeavours have been taken to obtain all necessary permissions from third parties to include their copyrighted content within this article, their full citation and copyright line may not be present in this Accepted Manuscript version. Before using any content from this article, please refer to the Version of Record on IOPscience once published for full citation and copyright details, as permission may be required. All third party content is fully copyright protected, unless specifically stated otherwise in the figure caption of the Version of Record.
Sponsor
Engineering & Physical Science Research Council (E
Identifier
https://iopscience.iop.org/article/10.1088/2040-8986/ab4056
Grant Number
EP/R004994/1
Subjects
Science & Technology
Physical Sciences
Optics
plasmon
two-dimensional materials
plasmonic waveguides
waveguide junctions
TERAHERTZ
DISCONTINUITIES
Optics
0205 Optical Physics
0906 Electrical and Electronic Engineering
0206 Quantum Physics
Publication Status
Published online
Article Number
105002
Date Publish Online
2019-09-02