Beam canalization by a non-Abelian gauge field
Olha Bahrova, Jiahao Ren, Feng Jin, Rui Su, Guillaume Malpuech + 1 more
TLDR
A non-Abelian gauge field significantly enhances beam canalization in photonic systems, achieving a ten-fold improvement.
Key contributions
- Explores beam canalization using hyperbolic/quasi-flat isofrequency contours from tilted Dirac points.
- Identifies that canalization is strongly assisted by coupling spatial dynamics with polarization pseudospin precession.
- Models this dynamic as a non-Abelian gauge field acting on emergent spin currents.
- Demonstrates a ten-fold enhancement of Gaussian beam canalization due to the gauge field.
Why it matters
This research introduces a novel mechanism for enhancing beam canalization, leveraging non-Abelian gauge fields. It provides a theoretical framework and evidence for a significant ten-fold improvement, opening new avenues for photonic device design.
Original Abstract
Hyperbolic and quasi-flat isofrequency contours (IFCs) are used for beam canalization and can be created by tilted Dirac points in photonic systems. Dirac points in microcavities are generated by the combination of transverse-electric/transverse-magnetic splitting and linear birefringence. We show that the canalization is here strongly assisted by the coupling between the spatial dynamics and polarization pseudospin precession. This dynamics is well described analytically and numerically as the action of a non-Abelian gauge field on emergent charges (spin current). We demonstrate a ten-fold enhancement of the canalization for a Gaussian beam by the gauge field, as compared to a description based solely on the group velocity associated with the IFCs.
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