title: Tunable Spin dependent beam shift by simultaneously tailoring geometric and dynamical phases of light in inhomogeneous anisotropic medium.
abstract: Spin orbit interaction and the resulting Spin Hall effect of light are under recent intensive investigations because of their fundamental nature and potential applications. Here, we report an interesting manifestation of spin Hall effect of light and demonstrate its tunability in an inhomogeneous anisotropic medium exhibiting spatially varying retardance level. In our system, the beam shift occurs only for one circular polarization mode keeping the other orthogonal mode unaffected, which is shown to arise due to the combined spatial gradients of the geometric phase and the dynamical phase of light. The constituent two orthogonal circular polarization modes of an input linearly polarized light evolve in different trajectories, eventually manifesting as a large and tunable spin separation. The spin dependent beam shift and the demonstrated principle of simultaneously tailoring space-varying geometric and dynamical phase of light for achieving its tunability (of both magnitude and direction), may provide an attractive route towards development of spin-optical devices.
authors.affiliation: Dept. of Physical Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur 741 246, Nadia, West Bengal, India.
authors.forename: Mandira
authors.initials: M
authors.lastname: Pal
authors.affiliation: Dept. of Physical Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur 741 246, Nadia, West Bengal, India.
authors.forename: Chitram
authors.initials: C
authors.lastname: Banerjee
authors.affiliation: Dept. of Physical Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur 741 246, Nadia, West Bengal, India.
authors.forename: Shubham
authors.initials: S
authors.lastname: Chandel
authors.affiliation: Dept. of Physical Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur 741 246, Nadia, West Bengal, India.
authors.forename: Ankan
authors.initials: A
authors.lastname: Bag
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: Shovan K
authors.initials: SK
authors.lastname: Majumder
authors.affiliation: Dept. of Physical Sciences, Indian Institute of Science Education and Research - Kolkata, Mohanpur 741 246, Nadia, West Bengal, India.
authors.forename: Nirmalya
authors.initials: N
authors.lastname: Ghosh