Hybrid Plasmonic Waveguide Comprising a Semiconductor Nanowire and Metal Ridge for Low-Loss Propagation and Nanoscale Confinement

The proposed hybrid plasmonic waveguide comprises a semiconductor cylindrical nanowire embedded in a low-index dielectric above a metallic substrate with two grooves carved into the surface, between which a nanoscale metallic ridge is formed. Comparing the original hybrid plasmonic structure having...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2012-11, Vol.18 (6), p.1661-1668
Main Author: Huang, Chia-Chien
Format: Article
Language:English
Subjects:
Confinement
Dielectrics
Guided waves
Hybrid structures
Metals
Nanocomposites
Nanomaterials
nanophotonic
Nanowires
Optical waveguides
photonic integrated circuit
plasmonic waveguides
Plasmonics
Plasmons
Propagation
Ridges
Semiconductor waveguides
Semiconductors
surface plasmons
Surface waves
Wildcats
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Summary:The proposed hybrid plasmonic waveguide comprises a semiconductor cylindrical nanowire embedded in a low-index dielectric above a metallic substrate with two grooves carved into the surface, between which a nanoscale metallic ridge is formed. Comparing the original hybrid plasmonic structure having a flat metal surface with the proposed structure significantly reduces the lateral mode size of the hybrid modes, and moderately increases the propagation distance. The mode area and propagation distance dependences on the geometry and material parameters are studied. A parametric plot of the figure of merit shows that the proposed structure outperforms the original hybrid structure. The mode performances can be improved further by rounding the metallic ridge corners with the maximum radius. Under an equal confinement of light, the propagation distance of the present structure is three times larger than that of the previously published hybrid structure.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2012.2184272