Polarization-based spatial filtering for directional and nondirectional edge enhancement using an S-waveplate

Area of Science:

• Optics and Photonics
• Image Processing

Background:

• Spatial filtering typically relies on amplitude and phase manipulations.
• Polarization offers an additional parameter for advanced optical filtering.
• S-waveplates can convert linear polarization to radial or azimuthal polarization.

Purpose of the Study:

• To explore the full potential of S-waveplates as spatial filters.
• To demonstrate a flexible edge enhancement technique using polarization.
• To achieve both isotropic and anisotropic edge enhancement with a single setup.

Main Methods:

• Utilizing an S-waveplate for polarization conversion.
• Employing different illumination polarization states (linear, radial, azimuthal).
• Using a fixed polarizer at the output for edge selection.

Main Results:

• Demonstrated isotropic edge enhancement with S-waveplates.
• Achieved anisotropic edge enhancement by controlling illumination polarization.
• Showcased the ability to perform edge enhancement in any orientation without polarizer adjustment.

Conclusions:

• S-waveplates offer a powerful and flexible approach to spatial filtering.
• Polarization-based spatial filtering provides advantages over traditional methods.
• This method enables versatile edge enhancement for various applications.