Abstract
We investigate an architecture where a plasmonic vortex excited in a gold surface propagates on an adiabatically tapered magnetic tip and detaches to the far-field while carrying a well-defined optical angular momentum. We analyze the out-coming light and show that, despite generally high losses of flat magnetic surface, our 3D structure exhibits high energy throughput. Moreover, we show that once a magneto-optical activity is activated inside the magnetic tip a modulation of the total power transmittance is possible.
Highlights
Structured optical beams became a subject of an intense research [1], due to numerous potential applications they offer in the fields of super-resolution imaging [2], optical tweezing [3], nanomanipulation [4] and telecommunications [5]
We investigate an architecture where a plasmonic vortex excited in a gold surface propagates on an adiabatically tapered magnetic tip and detaches to the far-field while carrying a welldefined optical angular momentum
plasmonic vortices (PVs) are usually generated by coupling propagating vortex beams to the plasmonic mode on a metal surface by using center-symmetric coupling structure, known as plasmonic vortex lenses (PVLs) [9]
Summary
Structured optical beams became a subject of an intense research [1], due to numerous potential applications they offer in the fields of super-resolution imaging [2], optical tweezing [3], nanomanipulation [4] and telecommunications [5]. A special interest is dedicated to investigation of the interaction of structured light with metallic nanostructures, resulting in Surface Plasmon Polaritons (SPPs) carrying angular momentum (AM) [6,7,8,9,10,11,12,13] These surface confined electromagnetic distributions are generally defined by a field singularity surrounded by a helical phase front, referred here as plasmonic vortices (PVs). These effects can be solely controlled by the properly designed 3D shape of the tip and by the illuminating beam parameters.
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