Low-loss forward and backward surface plasmons in a semiconductor nanowire coated by helical graphene strips
| Autor: | Shcherbinin, Vitalii I., Fesenko, Volodymyr I., Tuz, Vladimir R. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Journal of the Optical Society of America B 35, 2018, 2066-2074 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/JOSAB.35.002066 |
| Popis: | In the long-wavelength approximation, the effective conductivity tensor is introduced for graphene ribbons (strips) placed periodically at the interface between two media. The resulting conducting surface is considered as a coating for semiconductor nanowire. For the hybrid waves of such nanowire the dispersion equations are obtained in explicit form. Two types of surface plasmons are found to exist: (i) the modified surface plasmons, which originate from the ordinary surface plasmons of a graphene-coated semiconductor nanowire, and (ii) the spoof plasmons, which arise on the array of graphene ribbons and may possess forward-wave and backward-wave dispersion. It is revealed that the spoof surface plasmons are low-loss ones, and their frequencies, field-confinement and group velocities can be tuned widely by adjusting the coil angle and width of helical graphene strips. Comment: 8 pages, 8 figures |
| Databáze: | arXiv |
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