Influence of orbital angular momentum of light on random spin-split modes in disordered anisotropic optical media

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Anwesha Panda - , Indian Institute of Science Education and Research, Kolkata (Author)
  • Sneha Dey - , University of Calcutta, Universita' di Napoli Federico II (Author)
  • Yogishree Arabinda Panda - , Clusters of Excellence PoL: Physics of Life, Chair of mechanics of active biomaterials (Heisenberg) (CMCB) (Author)
  • Aditya Anurag Dash - , Indian Institute of Science Education and Research, Kolkata (Author)
  • Aloke Jana - , Colorado School of Mines (Author)
  • Nirmalya Ghosh - , Indian Institute of Science Education and Research, Kolkata (Author)

Abstract

Spin-orbit interaction of light in a disordered anisotropic medium is known to yield spin split modes in the momentum domain because of the random spatial gradient of the geometric phase of light. Here, we have studied the statistics of such spin-split modes for beams carrying intrinsic orbital angular momentum through the quantification of momentum domain entropy and investigated its dependence on various beam parameters. The influence of the spatial structure of the beam and the phase vortex on the statistics of the spin split modes were separately investigated using input Laguerre-Gaussian and Perfect Vortex beams passing through a disordered anisotropic medium with controlled input disorder parameter, which was realized by modulating the pixels of a liquid crystal-based spatial light modulator. The results of systematic investigations on the impact of beam waist, spot size and topological charge of the vortex beam show that the influence of the spot size on the emergence of the random spin split modes is much more significant as compared to the other beam parameters.

Details

Original languageEnglish
Article number155401
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume57
Issue number15
Publication statusPublished - 14 Aug 2024
Peer-reviewedYes

Keywords

Keywords

  • spatial phase gradient, spin-orbit interaction of light, vortex beam