Open AccessCurved terahertz surface plasmonic waveguide devices
Author(s) -
Min Yuan,
Yunqing Lu,
Ying Zhang,
Ziying Zhang,
Yanfeng Li,
HongChao Liu,
Xixiang Zhang,
Jiaguang Han,
Weili Zhang
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.385676
Subject(s) - terahertz radiation , surface plasmon polariton , optics , surface plasmon , radius of curvature , materials science , transmittance , bend radius , plasmon , curvature , waveguide , optoelectronics , bending , physics , mean curvature , geometry , mathematics , mean curvature flow , composite material
Strongly confined surface waves can be achieved on periodically structured metal surfaces and are known as spoof surface plasmon polaritons (SPPs). In this work, several terahertz SPP devices based on curved waveguides are demonstrated. The transmittance and bending loss of 90-degree curved spoof SPP waveguides with a radius of curvature ranging from 200 to 2300 µm are investigated to identify the regime for high transmission. A commutator is designed and experimentally demonstrated. Furthermore, coupling equations are derived and verified for efficient coupling between bend-straight waveguides and between bend-bend waveguides. The results will be of great value for future integrated terahertz plasmonic systems.