Plasmonic waveguide with folded stubs for highly confined terahertz propagation and concentration.

Published

Journal Article

We proposed a novel planar terahertz (THz) plasmonic waveguide with folded stub arrays to achieve excellent terahertz propagation performance with tight field confinement and compact size based on the concept of spoof surface plasmon polaritons (spoof SPPs). It is found that the waveguide propagation characteristics can be directly manipulated by increasing the length of the folded stubs without increasing its lateral dimension, which exhibits much lower asymptotic frequency of the dispersion relation and even tighter terahertz field confinement than conventional plasmonic waveguides with rectangular stub arrays. Based on this waveguiding scheme, a terahertz concentrator with gradual step-length folded stubs is proposed to achieve high terahertz field enhancement, and an enhancement factor greater than 20 is demonstrated. This work offers a new perspective on very confined terahertz propagation and concentration, which may have promising potential applications in various integrated terahertz plasmonic circuits and devices, terahertz sensing and terahertz nonlinear optics.

Full Text

Duke Authors

Cited Authors

  • Ye, L; Xiao, Y; Liu, N; Song, Z; Zhang, W; Liu, QH

Published Date

  • January 2017

Published In

Volume / Issue

  • 25 / 2

Start / End Page

  • 898 - 906

PubMed ID

  • 28157978

Pubmed Central ID

  • 28157978

Electronic International Standard Serial Number (EISSN)

  • 1094-4087

International Standard Serial Number (ISSN)

  • 1094-4087

Digital Object Identifier (DOI)

  • 10.1364/oe.25.000898

Language

  • eng