Fractional vortex dipole phase filter

• DOI: 10.1007/s00340-014-5839-5
• Publication Date: 2014-05-12T11:52:24Z
• Authors: Manoj Kumar Sharma; Joby Joseph; Paramasivam Senth...
• Keywords: Spatial filter; Optical vortex

In spatial filtering experiments, the use of vortex phase filters plays an important role in realizing isotropic edge enhancement. In this paper, we report the use of a vortex dipole phase filter in spatial filtering. A dipole made of fractional vortices is used, and its filtering characteristics are studied. It is observed that the filter performance can be tuned by varying the distance of separation between the vortices of the dipole to achieve better contrast and output noise suppression, and when this distance tends to infinity, the filter performs like a 1-D Hilbert mask. Experimental and simulation results are presented.