Metasurface for Reciprocal Spin-Orbit Coupling of Light on Waveguiding Structures

Abstract

Light manipulation through spin-orbit coupling opens new perspectives in photonics and particularly in integrated optics. The reverse spin Hall effect, where the guided wave direction affects the polarization properties of the light scattered by a nanostructure, is a key effect for the development of new functionalities at the connection between integrated structures and free space, and could find application in chiral quantum optics, modulation, and multiplexing. We show that metasurfaces represent a promising platform for the reverse spin Hall effect. Using a periodic array of-shaped metallic nanoantenna, we control the polarization of the extracted light with the guided wave-propagation direction, but also the number of output directions and the polarization of each one. These results and the versatility of metasurfaces for the spin Hall effect could be extended to various frequencies and materials, such as silicon photonics at telecom wavelength.

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.…”

Nanoparticle lattices with bases: Fourier modal method and dipole approximation

“…At the same time, the choice of dielectric or plasmonic material, the shape of the particle adjustment and the tuning of particle resonances give us wide opportunities in the determination of their optical properties for a demonstration of bright physical effects and their application for different purposes. Such metasurfaces have already been successfully implemented for holography [1][2][3], demonstration and implementation of lattice plasmon resonances [4][5][6][7][8][9], biosensors [10][11][12], spin-orbit coupling [13] and many other purposes.…”

Spin-locking metasurface for surface plasmon routing

“…Somewhat more general concept of the spin-degeneracy lifting by metasurfaces with the inversion symmetry violation was recently proposed as a novel route towards spin-based nanophotonics 21,22 . Additional systems based on the three-dimentional holography and the resiprocal spin-orbit effect were suggested in the context of the nanophotonic and plasmonic devices 23,24 . Nevertheless, recently it was found that the SPs could carry a so-called transverse spin (TS) angular momentum which resulted from the relative quarter period phase lag between the longitudinal and the transverse field components 25,26 .…”

“…[17][18][19][20] This effect has been widely studied and various promising nanophotonic applications have been proposed. 21,22 Nevertheless, recently it was suggested that the SPs could carry a so-called transverse spin (TS) angular momentum which resulted from the relative quarter period phase lag between the longitudinal and the transverse field components. 23,24 This TS was shown to be locked to the wave propagation direction and it had already been demonstrated that by illuminating a single slit in a metallic surface it was possible to create a projection of the longitudinal spin (LS, circular polarization handedness) onto the TS of the SP and excite unidirectional plasmonic wave.…”