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Area of Science:

  • Optics and Photonics
  • Plasmonics
  • Complex Light Fields

Background:

  • Spatially inhomogeneous polarization and optical singularities in light beams lead to novel optical phenomena.
  • Manipulating complex optical fields is crucial for advanced applications.

Purpose of the Study:

  • To propose and investigate a spiral blade plasmonic vortex lens (SBPVL) for controlling complex optical fields.
  • To demonstrate the synthesis of tunable plasmonic vortices and manipulation of fractional angular momentum (AM).

Main Methods:

  • Theoretical derivations and numerical simulations were employed.
  • The design of the SBPVL involves a nonlinear superposition of pitch and blade elements to define its geometrical topological charge.

Main Results:

  • The SBPVL enables strong interaction with optical complex fields, synthesizing highly tunable plasmonic vortices.
  • Plasmonic vortex characteristics are governed by the light's angular momentum (AM) and the SBPVL's geometrical topological charge.
  • The SBPVL can focus and manipulate optical complex fields with fractional AM by adjusting geometric parameters.

Conclusions:

  • The proposed SBPVL is an effective miniature device for manipulating complex optical fields.
  • This technology holds potential for applications in optical trapping and optical data storage.