Open AccessTrapping surface plasmon polaritons on ultrathin corrugated metallic strips in microwave frequencies
Author(s) -
Yang Yan,
Xiaopeng Shen,
Ping Zhao,
Hao Chi Zhang,
Tie Jun Cui
Publication year - 2015
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.23.007031
Subject(s) - surface plasmon polariton , terahertz radiation , materials science , strips , microwave , optics , surface plasmon , plasmon , trapping , optoelectronics , dielectric , waveguide , polariton , physics , ecology , quantum mechanics , composite material , biology
It has been demonstrated that an ultrathin uniformly corrugated metallic strip is a good plasmonic waveguide in microwave and terahertz frequencies to propagate spoof surface plasmon polaritons (SPPs) with well confinement and small loss (Shen et al., PNAS 110, 40-45, 2013). Here, we propose a simple method to trap SPP waves on the ultrathin corrugated metallic strips in broad band in the microwave frequencies. By properly designing non-uniform corrugations with gradient-depth grooves, we show that the SPP waves are slowed down gradually and then reflected at pre-designed positions along the ultrathin metallic strip when the frequency varies. We design and fabricate the ultrathin gradient-corrugation metallic strip on a thin dielectric film. Both numerical simulation and measurement results validate the efficient trapping of SPP waves in broadband from 9 to 14 GHz. This proposal is a promising candidate for slow-wave devices in both microwave and terahertz regimes.