Interplay between diffraction and the Pancharatnam-Berry phase in inhomogeneously twisted anisotropic media

Abstract

We discuss the propagation of an electromagnetic field in an inhomogeneously anisotropic material where the optic axis is rotated in the transverse plane but is invariant along the propagation direction. In such a configuration, the evolution of an electromagnetic wavepacket is governed by the Pancharatnam-Berry phase (PBP), responsible for the appearance of an effective photonic potential. In a recent paper [A. Alberucci et al., "Electromagnetic confinement via spin-orbit interaction in anisotropic dielectrics", ACS Photonics \textbf{3}, 2249 (2016)] we demonstrated that the effective potential supports transverse confinement. Here we find the profile of the quasi-modes and show that the photonic potential arises from the Kapitza effect of light. The theoretical results are confirmed by numerical simulations, accounting for the medium birefringence. Finally, we analyze in detail a configuration able to support non-leaky guided modes.

14 pages, 13 figures

References in corpus (7)

• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
• Coriolis Effect in Optics: Unified Geometric Phase and Spin-Hall Effect
• Pancharatnam-Berry phase optical elements for wavefront shaping in the visible domain: switchable helical modes generation
• Functional metamirrors
• Non-Abelian evolution of electromagnetic waves in a weakly anisotropic inhomogeneous medium
• Electromagnetic confinement via spin-orbit interaction in anisotropic dielectrics

Cited by in corpus (1)

• Reorientational solitons in nematic liquid crystals with modulated alignment