Dispersion features of complex waves in a graphene-coated semiconductor nanowire

The dispersion features of a graphene-coated semiconductor nanowire operating in the terahertz frequency band are consistently studied in the framework of a special theory of complex waves. Detailed classification of the waveguide modes was carried out based on the analysis of characteristics of the...

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Bibliographic Details
Published in:Nanophotonics (Berlin, Germany) Germany), 2018-05, Vol.7 (5), p.925-934
Main Authors: Yu, Pengchao, Fesenko, Volodymyr I., Tuz, Vladimir R.
Format: Article
Language:English
Subjects:
Attenuation
complex waves
dispersion characteristics
Graphene
Leaky waves
Nanowires
Plasmons
Propagation modes
semiconductor nanowire
surface plasmons
Surface waves
Terahertz frequencies
Wave propagation
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Summary:The dispersion features of a graphene-coated semiconductor nanowire operating in the terahertz frequency band are consistently studied in the framework of a special theory of complex waves. Detailed classification of the waveguide modes was carried out based on the analysis of characteristics of the phase and attenuation constants obtained from the complex roots of characteristic equation. With such a treatment, the waves are attributed to the group of either “proper” or “improper” waves, wherein their type is determined as the trapped surface waves, fast and slow leaky waves, and surface plasmons. The dispersion curves of axially symmetric TM and TE modes, as well as nonsymmetric hybrid EH and HE modes, were plotted and analyzed in detail, and both radiative regime of leaky waves and guided regime of trapped surface waves are identified. The peculiarities of propagation of the TM modes of surface plasmons were revealed. Two subregions of existence of surface plasmons were found out where they appear as propagating and reactive waves. The cutoff conditions for higher-order TM modes of surface plasmons were correctly determined.
ISSN:2192-8614
2192-8606
2192-8614
DOI:10.1515/nanoph-2018-0026