On transmittance and localization of the electromagnetic wave in two-dimensional graphene-based photonic crystals
| Autor: | Roman Ya. Kezerashvili, Vladimir S. Boyko, Yurii E. Lozovik, Anton A. Kolesnikov, Oleg L. Berman |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Waveguide (electromagnetism) business.industry Graphene Band gap Terahertz radiation Physics::Optics General Physics and Astronomy Astrophysics::Cosmology and Extragalactic Astrophysics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Electromagnetic radiation law.invention law 0103 physical sciences Transmittance Optoelectronics Photonics 010306 general physics 0210 nano-technology business Photonic crystal |
| Zdroj: | Physics Letters A. 382:2075-2080 |
| ISSN: | 0375-9601 |
| DOI: | 10.1016/j.physleta.2018.05.023 |
| Popis: | Two-dimensional graphene-based photonic crystal (GPC) formed by a periodic array of the homogeneous dielectric cylinders etched in the alternating graphene and dielectric layers and its inverse counterpart are considered. The transmittance of the photonic crystal is obtained. The waveguide due to the localization of the electromagnetic wave on the lattice defect that breaks the translational symmetry of the GPC of two different topologies is studied. The different topologies of GPC are characterized by different photonic band structures with different widths of photonic band gaps (PBG) and provide different frequencies for the localized electromagnetic wave due to the defect. The frequencies of the localized mode for both type of the GPC, located inside the lowest PBG, are in the range of THz or tens of THz depending on the topology of the GPC. It is shown that the photonic band gap always can be tuned by changing the chemical potential of graphene to provide formation of the localized photonic mode due to the defect. The technological advantages of the GPC, as well as the opportunity to tune the PBG and the frequency of the localized electromagnetic wave in the terahertz region of spectrum for the GPC are discussed. |
| Databáze: | OpenAIRE |
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