We use a near-field microscope to visualize the nanoscale light patterns, both electric and magnetic fields [1,2]. The interplay between the various components of either the magnetic or the electric fields leads to optical entities that, in their size, put nanophotonics to shame: these optical singularities have a size zero. Interestingly, optical singularities near nanoscale structures exhibit a markedly different behavior from those in macroscopic beams [3,4]. We observe a distinctly different behavior around plasmonic nanowires to that above photonic crystal waveguides . Moreover, we show that these singularities and their associated local helicity can be applied for new quantum technology as they can be used to deterministically couple a spin-transition to emission direction , useful for novel quantum technology . In addition we show that plasmonic nanowires are better than dielectric waveguides for the transmission of ultrashort pulses . This can also be used to induce nonlinear phenomena .
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