[20p-A202-1~19] 3.1 Basic optics and frontier of optics (merged with formerly 3.2 Equipment optics and materials)

▲ [20p-A202-18] Optical vortex pair detection using a triangle aperture

〇(D)Dina Grace Calbero Banguilan¹, Nathaniel Hermosa¹ (1.UP Diliman)

Keywords:optical vortex, diffraction, topological charge

An optical vortex (OV) exists when the real and imaginary parts of a complex electromagnetic wave field become zero and the phase becomes singular at the beam's center. The light around a beam containing OVs carries a topological charge (TC) \ell. However, higher-order OVs (HOOVs) occurring in physical systems are structurally unstable. An incident \ell-charged HOOV may decompose into |\ell| single-charged OVs by conservation of topological charges. Due to their instability, OVs may appear at random locations within the host background. Here, we detect an optical vortex pair (two single charged OVs in a single beam) using the diffraction of light by a triangular aperture.