High-efficiency surface plasmonic polariton waveguides with enhanced low-frequency performance in microwave frequencies
- 25 January 2017
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 25 (3), 2121-2129
- https://doi.org/10.1364/oe.25.002121
Abstract
In this paper, a planar waveguide based on spoof surface plasmon polaritons (SSPPs) with metals on both sides of the corrugated strip as grounds is firstly proposed in microwave region. Simple and efficient conversion between guided waves and SSPPs is realized by gradient corrugated strip with grounds on both sides. Compared with plasmonic waveguide with flaring ground [Laser Photonics Rev. 8, 146 (2014)], the addition of grounds suppresses the radiation loss effectively and improves the low-frequency performance with tighter field confinement, which leads to a wider operating bandwidth. Moreover, as the asymptotic frequency of SSPPs decreasing, the confinement of SSPPs is further enhanced by a defected ground structure (DGS), which is achieved by the periodic grooves symmetrical to those on the corrugated strip. Therefore, miniaturization of the proposed waveguide can be realized. Measured results validate both high efficiency of momentum and impedance matching and enhanced performance in the region of lower frequencies with the wave vectors close to those in free space. Such results have significant values in plasmonic functional devices and integrated circuits in microwave frequencies.Keywords
Funding Information
- National Natural Science Foundation of China (NSFC) (61371044, 61401122, 61571155)
This publication has 32 references indexed in Scilit:
- Planar plasmonic metamaterial on a thin film with nearly zero thicknessApplied Physics Letters, 2013
- Conformal surface plasmons propagating on ultrathin and flexible filmsProceedings of the National Academy of Sciences of the United States of America, 2012
- Highly confined guiding of terahertz surface plasmon polaritons on structured metal surfacesNature Photonics, 2008
- Waveguide Arrays as Plasmonic Metamaterials: Transmission below CutoffPhysical Review Letters, 2006
- Experimental Verification of Designer Surface PlasmonsScience, 2005
- Electromagnetic parameter retrieval from inhomogeneous metamaterialsPhysical Review E, 2005
- Surfaces with holes in them: new plasmonic metamaterialsJournal of Optics A: Pure and Applied Optics, 2005
- Mimicking Surface Plasmons with Structured SurfacesScience, 2004
- A new PBG structure: Corrugated CPWMicrowave and Optical Technology Letters, 2003
- Surface plasmon subwavelength opticsNature, 2003