Spin-locking metasurface for surface plasmon routing

Abstract

Nanophotonic circuitry requires an ability to externally control and analyze optical signals tightly confined in subwavelength volumes. Various schemes of surface plasmon (SP) routing have been presented using active and passive metasurfaces. One of the most appealing approaches is the use of plasmonic spin-orbit interaction where the incident light spin state is efficiently coupled to an orbital degree of freedom of the surface wave. Recently, a major attention has been drawn to an additional plasmonic degree of freedom - the transverse spin and some application for near-field plasmonic manipulations have been presented. Here we propose a spin-locking metasurface incorporating a transverse spin of the SP wave to selectively route the near-field beams. Owing to the combination of the oblique incidence of circularly polarized light with the accurately designed momentum matching of the grating we achieve a precise directional control over the plasmonic distributions. The experimental verification of the directional launching is performed by a time-resolved leakage radiation measurements allowing one to visualize the shape and the dynamics of the excited beam.

Polarization-Addressable Optical Movement of Plasmonic Nanoparticles and Hotspot Spin Vortices

“…Evanescent waves can also exert forces and moments produced by tSAM acting on particles [14,20,21]. Numerous applications have been derived, such as active selection [22] and chiral manipulation [23,24] via metasurfaces, the analysis of biologic complexes and structures [25], and the separation of chiral enantiomers with lateral forces induced by spin-momentum coupling [26].…”

Plasmonic grating for circularly-polarized out-coupling of waveguide-enhanced spontaneous emission

“…This study was followed up by a number of applications of similar structures for the so-called photonic spin-orbit coupling [55,56]. Most of them were also based on surface plasmons [26,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71], although the same principle is valid for dielectric waveguides as well [72,73]. Remarkably, the dielectric structures schemes attracted much less attention in this context, although they are much more widely spear in practice.…”

Topologically Protected Plasmonic Phases in Randomized Aperture Gratings

“…Light propagating in free space can undergo a continuous space variant polarization modulation in order to achieve smoothly varying Berry phases 21 . Recently, it has been shown that TP can also be introduced in the process of surface plasmon (SP) wavefront excitation [1][2][3] . A grating comprising spatially rotating apertures was used to obtain two effects simultaneouslycoupling incident light to SPs and imparting upon that light a geometric phase.…”