Resonant scattering from a two-dimensional honeycomb PT dipole structure

0499875 - ÚFE 2019 RIV US eng J - Článek v odborném periodiku
Markoš, P. - Kuzmiak, Vladimír
Resonant scattering from a two-dimensional honeycomb PT dipole structure.
Physical Review A. Roč. 97, č. 5 (2018), č. článku 053807. ISSN 2469-9926. E-ISSN 2469-9934
Grant CEP: GA ČR(CZ) GA16-00329S
Institucionální podpora: RVO:67985882
Klíčová slova: Refractive index * Honeycomb structures * Resonant scattering
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 2.907, rok: 2018

We studied numerically the electromagnetic response of the finite periodic structure consisting of the PT dipoles represented by two infinitely long, parallel cylinders with the opposite sign of the imaginary part of a refractive index, which are centered at the positions of a two-dimensional honeycomb lattice. We observed that the total scattered energy reveals a series of sharp resonances at which the energy increases by two orders of magnitude and an incident wave is scattered only in a few directions given by spatial symmetry of the periodic structure. We explain this behavior by analysis of the complex frequency spectra associated with an infinite honeycomb array of the PT dipoles and identify the lowest resonance with the broken PT-symmetry mode formed by a doubly degenerate pair with complex conjugate eigenfrequencies corresponding to the K point of the reciprocal lattice
Trvalý link: http://hdl.handle.net/11104/0292083