Enhancement of plasmon-photon coupling in grating coupled graphene inside a Fabry-Pérot cavity
| Autor: | Wenbo Xu, H. Qin, François M. Peeters, C.X. Zhao, H. M. Dong, Yunjin Yu |
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| Rok vydání: | 2018 |
| Předmět: |
Electromagnetic field
Photon Materials science Terahertz radiation Physics::Optics 02 engineering and technology Grating 01 natural sciences law.invention law Electric field 0103 physical sciences Physics::Atomic and Molecular Clusters Materials Chemistry 010306 general physics Computer Science::Databases Plasmon business.industry Graphene Physics Finite-difference time-domain method General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Optoelectronics 0210 nano-technology business |
| Zdroj: | Solid state communications |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/j.ssc.2018.06.005 |
| Popis: | We present a theoretical investigation of the plasmon-polariton modes in grating coupled graphene inside a Fabry-Perot cavity. The cavity or photon modes of the device are determined by the Finite Difference Time Domain (FDTD) simulations and the corresponding plasmon-polariton modes are obtained by applying a many-body self-consistent field theory. We find that in such a device structure, the electric field strength of the incident electromagnetic (EM) field can be significantly enhanced near the edges of the grating strips. Thus, the strong coupling between the EM field and the plasmons in graphene can be achieved and the features of the plasmon-polariton oscillations in the structure can be observed. It is found that the frequencies of the plasmon-polariton modes are in the terahertz (THz) bandwidth and depend sensitively on electron density which can be tuned by applying a gate voltage. Moreover, the coupling between the cavity photons and the plasmons in graphene can be further enhanced by increasing the filling factor of the device. This work can help us to gain an in-depth understanding of the THz plasmonic properties of graphene-based structures. |
| Databáze: | OpenAIRE |
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