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Index polarity inversion by helicity inversion in Stokes vortices

2020; American Institute of Physics; Volume: 117; Issue: 20 Linguagem: Inglês

10.1063/5.0024807

1520-8842

S.K. Pal, P. Senthilkumaran,

Digital Holography and Microscopy

To describe the state of polarization (SOP) of light, the Stokes parameters are obtained using intensity measurements made at different component polarization states. Using these Stokes parameters, complex field distributions called Stokes fields can be synthesized, and the phase singularities present in these Stokes fields are called Stokes vortices. The SOP of a Stokes vortex can be either linear or circular at the singular point. Of the three types of Stokes vortices, only one of them has handedness associated with it. We show here that changing the handedness of this Stokes vortex results in index sign inversion for the other two types of Stokes vortices. To accomplish handedness inversion without Stokes index sign inversion, a new phase engineering method is introduced here. The current study may unfold applications in the optical chirality measurement and structured illumination microscopy.