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13
2026
-
04
Laser Emission from the Ground-State Orbital Angular Momentum of Liquid-Crystal Torons in Microcavities
Author:
A team led by Jacek Szczytko at the University of Warsaw in Poland and a team led by Guillaume Malpuech at Clermont Auvergne University have demonstrated that when topological defects—specifically torons—in liquid-crystal textures are embedded within a microcavity, they give rise to a real-space non-Abelian gauge field. This gauge field induces a topological reversal between the ground state and excited states. As a result, the resulting ground state can sustain stable lasing and exhibits non-zero orbital angular momentum in each circular-polarization component.
The research findings were published in Science Advances on March 13, 2026, under the title “Ground-state orbital angular momentum lasing from liquid crystal torons embedded in a microcavity.”
Figure 1: Chiral nematic liquid crystal toron
Figure 2: Spectral and polarization properties of a single toron-bound photonic state in a liquid-crystal microcavity.
Figure 3: OAM laser
Figure 4: Non-Abelian Gauge Field Effects
Figure 5: Voltage Tunability of Photonic Trap Size
Source: Optical World
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