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Non-Hermitian exceptional points (EPs) represent a special type of degeneracywhere not only the eigenvalues coalesce, but also the eigenstates tend tocollapse on each other. Recent studies have shown that in the presence of anEP, light-matter interactions are profoundly modified, leading to a host ofnovel optical phenomena ranging from enhanced sensitivity to chiral lighttransport. As of now, however, in order to stabilize a system at the vicinityof an exceptional point, its related parameters must be carefully tuned and/orcontinuously controlled. To overcome this limitation, here we introduce a newfamily of broadband exceptional points based on unidirectional coupling,implemented by incorporating an Sshaped waveguide in a microring cavity. Inactive settings, the resulting unidirectionality exhibits unprecedentedresilience to perturbations, thus providing a robust and tunable approach fordirectly generating beams with distinct orbital angular momentum (OAM). Thiswork could open up new possibilities for manipulating OAM degrees of freedom inapplications pertaining to telecommunications and quantum computing, while atthe same time may expand the notions of non-Hermiticity in the orbital angularmomentum space.

Direct generation of tunable orbital angular momentum beams in microring lasers with broadband exceptional points