Dynamic control of multi-channel plasmonic vector vortex with integer- and fractional-order based on mode extraction

Plasmonic vector vortex created by coupling vector vortex beam to microstructure on metal dielectric interface has attracted great interests in the research field of nanophotonics. However, the complicated polarization of incident vector beam and the excitation way of plasmonic waves based on the fixed microstructure give rise to big challenges in controlling plasmonic vector vortex mode with arbitrary order in a real-time and dynamically. Here, we solve this scientific problem by generating multi-channel plasmonic vector vortex with integer-and fractional-order using the principle of mode extraction along with optical pen. Without changing the polarization state of incident vector beam, plasmonic vector vortex mode in each channel is extracted directly from a high -order vector vortex beam based on the principle of mode extraction. The number, position, amplitude and phase of plasmonic vector vortex mode can further be arranged in an arbitrary manner with the aid of optical pen on the gold film. This work presents a flexible method of tailoring complicated plasmonic field on a metal film, which may offer new possibilities for the applications of plasmonic tweezers, Raman imaging etc.