Helicity dependent diffraction by angular momentum transfer.

Abstract:

:In this article we show that diffraction segregates the polarization singularities according to their handedness. Polarization singularities are superpositions of left and right handed circular polarization vortex states. In the superposition, the component states possess different orbital angular momenta depending on the type of the singularity. A fork grating that can generate different orbital angular momentum (OAM) states in different diffraction orders is shown to segregate right and left handed polarization singularities. A V-point polarization singularity that corresponds to one combination of OAM states incident on the fork grating is found to diffract in such a way that the same OAM combination does not occur in all the nonzero diffraction orders. As a result, each of the diffraction orders will have different polarization singularities. This OAM transfer by the fork grating segregates the right and left handed polarization singularities thereby, making the diffraction helicity dependent.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Deepa S,B S BR,Senthilkumaran P

doi

10.1038/s41598-019-48923-6

subject

Has Abstract

pub_date

2019-08-28 00:00:00

pages

12491

issue

1

issn

2045-2322

pii

10.1038/s41598-019-48923-6

journal_volume

9

pub_type

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