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2015 ; 5
(ä): 11457
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Wedge hybrid plasmonic THz waveguide with long propagation length and ultra-small
deep-subwavelength mode area
#MMPMID26155782
Gui C
; Wang J
Sci Rep
2015[Jul]; 5
(ä): 11457
PMID26155782
show ga
We present a novel design of wedge hybrid plasmonic terahertz (THz) waveguide
consisting of a silicon (Si) nanowire cylinder above a triangular gold wedge with
surrounded high-density polyethylene as cladding. It features long propagation
length and ultra-small deep-subwavelength mode confinement. The mode properties
of wedge hybrid plasmonic THz waveguide are comprehensively characterized in
terms of propagation length (L), normalized mode area (Aeff/A0), figure of merit
(FoM), and chromatic dispersion (D). The designed wedge hybrid plasmonic THz
waveguide enables an ultra-small deep-subwavelength mode area which is more than
one-order of magnitude smaller compared to previous rectangular one. When
choosing the diameter of Si nanowire cylinder, a smaller diameter (e.g. 10??m) is
preferred to achieve longer L and higher FoM, while a larger diameter (e.g.
60??m) is favorable to obtain smaller Aeff/A0 and higher FoM. We further study
the impacts of possible practical fabrication errors on the mode properties. The
simulated results of propagation length and normalized mode area show that the
proposed wedge hybrid plasmonic THz waveguide is tolerant to practical
fabrication errors in geometry parameters such as misalignment in the horizontal
direction, variation of wedge tip angle, and variation of wedge tip curvature
radius.