Presentation Information
[9a-PA6-6]Composite Vortex Topology
〇(D)Rudrashis Panda1, Sushanta Kumar Pal2, Rakesh Mohan Das1 (1.KIIT University, 2.SOA University)
Keywords:
Structured Light,Optical Quasiparticle,Vortex Beam
We investigate the generation of triangularly symmetric composite vortex beams through the coaxial superposition of four structured light beam families: Bessel–Gaussian (BG), Bessel (B), Laguerre–Gaussian (LG), and Hermite–Gaussian (HG) beams. Numerical simulations are performed at a wavelength of 633 nm with a beam waist radius of 2 mm at the beam waist plane (z=0). For the BG, B, and LG cases, composite vortex beams are formed by superposing two modes carrying topological charges (l1=1) and (l2=4). The resulting fields contain a central on-axis vortex surrounded by three off-axis vortices arranged in a triangular geometry. The central vortex is governed by the lower absolute topological charge, while the number of peripheral vortices is given by |l2-l1|. The corresponding HG realization is obtained by expressing the LG modes as weighted superpositions of HG modes. Although all beam families produce identical vortex topology and symmetry, the inter-vortex separation strongly depends on the underlying beam profile. While BG and Bessel beams yield identical vortex spacing, LG and HG beams exhibit progressively larger separations. These results demonstrate independent control of vortex topology and spacing, offering a versatile approach for structured-light applications in optical trapping, quantum information processing, spatial-mode communications, and quasi-particle generation.