Journal
PLASMONICS
Volume 12, Issue 6, Pages 1947-1951Publisher
SPRINGER
DOI: 10.1007/s11468-016-0466-0
Keywords
THz wave; Surface plasmon polaritons; THz waveguides; Metal nanowires
Funding
- National Natural Science Foundation of China [61405124]
- Natural Science Foundation of Guangdong Province, China [2014A030313560]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20134408120002]
- Shenzhen Science and Technology Project of Shenzhen, China [JCYJ20160308092830132, JCYJ20140418091413577]
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A metal nanowire placed in a dielectric hole is proposed to guide THz modified surface plasmon polaritons (MSPPs). In theory, the MSPP waveguide can guide THz wave with nano-scale mode width (570 nm) and simultaneously ultra-long propagation distance (2.4 m). Compared with conventional surface plasmon polaritons (SPPs) on a bare metal nanowire, the MSPPs' mode nanoconfinement can be maintained by keeping a part of the mode field nearly unchanged. On the other hand, by modifying the rest of the mode field, the THz power inside the metal nanowire can be significantly reduced for MSPPs, which dramatically decreases the propagation loss (3 orders of magnitude).
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