Experimental demonstration of linear and spinning Janus dipoles for polarisation- and wavelength-selective near-field coupling.

ABSTRACT: The electromagnetic field scattered by nano-objects contains a broad range of wavevectors and can be efficiently coupled to waveguided modes. The dominant contribution to scattering from subwavelength dielectric and plasmonic nanoparticles is determined by electric and magnetic dipolar responses. Here, we experimentally demonstrate spectral and phase selective excitation of Janus dipoles, sources with electric and magnetic dipoles oscillating out of phase, in order to control near-field interference and directional coupling to waveguides. We show that by controlling the polarisation state of the dipolar excitations and the excitation wavelength to adjust their relative contributions, directionality and coupling strength can be fully tuned. Furthermore, we introduce a novel spinning Janus d

SUBMITTER: Picardi MF 

PROVIDER: S-EPMC6548777 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature