Modulation of Amplitude Range and Synchronization for Surface Plasmon Polariton Vortices

Abstract Prior research on exciting the surface plasmon polariton (SPP) vortices has largely employed circular polarized light, but linearly polarized light has been adopted in more recent plasmonic vortex lens (PVL) designs to achieve simpler excitation conditions. However, existing techniques lack control over the modulation range and synchronization of vortex field amplitudes at different on‐chip positions. In this work, some linear‐polarization‐sensitive PVLs using meta‐atoms composed of two high‐aspect‐ratio rectangular slits are designed. The theoretical analysis and numerical simulations prove that dynamically adjusting the polarization direction of incident light enables real‐time amplitude modulation of SPP vortices, while tuning the slit rotation angles controls both the synchronization and range of amplitude variations. This approach facilitates dynamic applications of SPP vortices, such as nanoscale particle manipulation and real‐time biochemical analysis.