Corrugated metal surface with pillars for terahertz surface plasmon polariton waveguide components

Xu Yuehong, Li Yanfeng, Chunxiu Tian, Jiaguang Han, Xu Quan, Zhang Xueqian, Zhang Xixiang, Zhang Ying, Zhang Weili

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In the terahertz regime, due to perfect conductivity of most metals, it is hard to realize a strong confinement of Surface plasmon polaritons (SPPs) although a propagation loss could be sufficiently low. We experimentally demonstrated a structure with periodic pillars arranged on a thin metal surface that supports bound modes of spoof SPPs at terahertz (THz) frequencies. By using scanning near-field THz microscopy, the electric field distribution above the metal surface within a distance of 130 μm was mapped. The results proved that this structure could guide spoof SPPs propagating along subwavelength waveguides, and at the same time reduce field expansion into free space. Further, for the development of integrated optical circuits, several components including straight waveguide, S-bend, Y-splitter and directional couplers were designed and characterized by the same method. We believe that the waveguide components proposed here will pave a new way for the development of flexible, wideband and compact photonic circuits operating at THz frequencies.
Original languageEnglish (US)
Title of host publication2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications
PublisherSPIE-Intl Soc Optical Eng
ISBN (Print)9781510617575
DOIs
StatePublished - Jan 12 2018

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