Surface plasmon - polaritons in structure of dielectric - graphene - antiferromagnetic

Nowadays, in plasmonics great researchers attention is paid to investigation of graphene-based nanostructures and perspectives of its applications in data processing and storage devices [1]. In our recent works we have... [ view full abstract ]

Nowadays, in plasmonics great researchers attention is paid to investigation of graphene-based nanostructures and perspectives of its applications in data processing and storage devices [1]. In our recent works we have considered some graphene-containing structures. Some interesting results on speckle-pattern rotation in graphene-coated optical fibers [2], surface plasmon manipulation by magnetic field in the planar gyrotropic waveguide formed by two graphene layers [3], plasmonically induced magnetic field and Faraday rotation of high order modes in graphene-covered nanowires [4, 5] have been obtained.
In this work surface plasmon-polaritons in dielectric – graphene – antiferromagnet structure is investigated. We assume that dielectric is non-dispersive one, antiferromagnet is centrosymmetric few-sublattice magnet (of rhombic symmetry) with exchange spin excitations of electroactive type. Eigen frequencies of exchange modes correspond to infrared and visible spectrum ranges (for example, YBa2Cu3O6+x, α-Fe2O3). Frequency-dependence of graphene conductivity is taken into account.
Calculations are carried out in assumption of decaying length of surface electromagnetic wave is much greater than the lattice constant and phenomenological method may be used. Properties of the structure are depending on dielectric permittivity tensor of antiferromagnet and graphene conductivity.
Different propagation directions of electromagnetic wave with respect to antiferromagnet crystal orientation are considered. Dispersion equations and conditions of excitation of TM- and TE- waves and components of electromagnetic field are obtained. It is shown, that TE- waves, which are non-existing without graphene, may propagates in the structure when some relations between parameters of mediums are satisfied in frequency ranges of exchange modes of antiferromagnet.
This work was supported in part by RFBR (grants ## 16-37-00023, 16-07-00751, 16-29-14045) and RScF (grant # 14-22-00279).
1. K. S. Novoselov, et al. Nature 490, 192–200 (2012)
2. D. A. Kuzminr, et al. Opt. Lett. 40, 890-893 (2015)
3. D. A. Kuzminr, et al. Opt. Lett. 40, 2557-2560 (2015)
4. D. A. Kuzminr, et al. Opt. Lett. 41, 396-399 (2016)
5. D. A. Kuzminr, et al. Nano Lett. 16, 4391–4395 (2016)