Xuesong Deng

Nov 12, 2024 | opg.optica.org | Xuesong Deng |Ke Xu |Chao Wang |Miao Liu

We propose and discuss a simple method to generate broadband optical vortices, utilizing the inherent topological vortex structures of polarization around bound states in the continuum supported by a photonic crystal slab in the momentum space to induce the generation of vortex beams. Since the proposed structure is composed of silicon pillars arranged periodically, it lacks a true optical geometric center.