Experimental observation of topological Dirac vortex mode in terahertz photonic crystal fibers.

ABSTRACT: Photonic crystal fibers have significantly advanced optoelectronics, enabling a wide range of applications from communications to sensing and imaging. A long-standing challenge in these areas has been achieving pure single-polarization single-mode (SPSM) waveguiding for high-quality information transmission. Traditional approaches, however, inevitably introduce polarization dispersion and operate within a narrow bandwidth. Recent advancements in topological phases offer a promising opportunity to access previously unattainable mode properties, though experimental demonstrations remain scarce. In this work, we present the first experimental observation of a topologically protected photonic Dirac vortex mode that supports pure SPSM propagation in terahertz fibers. Utilizing terahertz scannin

SUBMITTER: Xing H 

PROVIDER: S-EPMC12859132 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature