Based on the metallic-dielectric high contrast gratings, we proposed two new different schemes to achieve the unidirectional coupling of incident free-space light into the plasmonic waveguides. Using the cascaded metal-air subgratings (structure 1) or metallic-dielectric subwavelength periodic gratings (structure 2), the ultra-broadband and wideangular SPPs excitation could be both achieved. The operation principle and performance of the structures are analyzed and discussed, respectively.
KEYWORDS: Dielectrics, Waveguides, Microrings, Free space optics, Solar concentrators, Plasmonics, Geometrical optics, Signal processing, Magnetism, Finite element methods
A novel optical coupler to access free-space optical signals in subwavelength scale into dielectric waveguide via a
plasmonic concentrator and a dielectric microring with field enhancement is proposed. The coupler is useful as it
combines the plasmonic concentrator, which is used to access optical signals in subwavelength scale, a microring
resonator for the coupling, with the dielectric waveguide for long distance optical transmission and processing.
We proposed a compact surface wave polarization splitter based on the metallic-dielectric-air (MDA) waveguide with an
slit surrounded by asymmetric corrugations. The incident light coupled to the MDA waveguide through the aperture is
split into TE- and TM-polarized electromagnetic surface modes by the polarization-sensitive corrugations on each side.
Polarization extinction ratios better than 20 dB are achieved for both polarizations. The structure would be interesting for
a variety of optical devices and nanophotonics.
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