Optics in spiral dislocation spacetime: torsion as a geometric waveguide and frequency-filtering mechanismSemra Gurtas Dogan, Omar Mustafa, Abdullah Guvendi and Hassan HassanabadiEur. Phys. J. C, 86 1 (2026) 31DOI: https://doi.org/10.1140/epjc/s10052-025-15239-x