Near- and Far-Field Excitation of Topological Plasmonic Metasurfaces

Photonics

StefanA. Maier¹  Xiaofei Xiao¹  Matthew Proctor²  RichardV. Craster²  Vincenzo Giannini³  PalomaArroyo Huidobro⁴ 

[1] Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK;Department of Mathematics, Imperial College London, London SW7 2AZ, UK;Instituto de Estructura de la Materia (IEM), Consejo Superior de Investigaciones Científicas (CSIC), Serrano 121, 28006 Madrid, Spain;Instituto de Telecomunicações, Insituto Superior Tecnico-University of Lisbon, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal;

关键词: topological nanophotonics;    plasmonic metasurface;    edge states;    pseudospin;    chiral;   

DOI  :  10.3390/photonics7040081

来源: DOAJ

【 摘 要 】

The breathing honeycomb lattice hosts a topologically non-trivial bulk phase due to the crystalline-symmetry of the system. Pseudospin-dependent edge states, which emerge at the interface between trivial and non-trivial regions, can be used for the directional propagation of energy. Using the plasmonic metasurface as an example system, we probe these states in the near- and far-field using a semi-analytical model. We provide the conditions under which directionality was observed and show that it is source position dependent. By probing with circularly-polarised magnetic dipoles out of the plane, we first characterise modes along the interface in terms of the enhancement of source emissions due to the metasurface. We then excite from the far-field with non-zero orbital angular momentum beams. The position-dependent directionality holds true for all classical wave systems with a breathing honeycomb lattice. Our results show that a metasurfac,e in combination with a chiral two-dimensional material, could be used to guide light effectively on the nanoscale.

【 授权许可】

Unknown