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2015 ; 9
(3
): 345-353
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Bulk plasmon-polaritons in hyperbolic nanorod metamaterial waveguides
#MMPMID26693254
Vasilantonakis N
; Nasir ME
; Dickson W
; Wurtz GA
; Zayats AV
Laser Photon Rev
2015[May]; 9
(3
): 345-353
PMID26693254
show ga
Hyperbolic metamaterials comprised of an array of plasmonic nanorods provide a
unique platform for designing optical sensors and integrating nonlinear and
active nanophotonic functionalities. In this work, the waveguiding properties and
mode structure of planar anisotropic metamaterial waveguides are characterized
experimentally and theoretically. While ordinary modes are the typical guided
modes of the highly anisotropic waveguides, extraordinary modes, below the
effective plasma frequency, exist in a hyperbolic metamaterial slab in the form
of bulk plasmon-polaritons, in analogy to planar-cavity exciton-polaritons in
semiconductors. They may have very low or negative group velocity with high
effective refractive indices (up to 10) and have an unusual cut-off from the
high-frequency side, providing deep-subwavelength (?(0)/6-?(0)/8 waveguide
thickness) single-mode guiding. These properties, dictated by the hyperbolic
anisotropy of the metamaterial, may be tuned by altering the geometrical
parameters of the nanorod composite.