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Exceptional points(EPs), branch points of complex energy surfaces at whicheigenvalues and eigenvectors coalesce, are ubiquitous in non-Hermitian systems.Many novel properties and applications have been proposed around the EPs. Oneof the important applications is to enhance the detection sensitivity. However,due to the lack of single-handed superchiral fields, all of the proposedEP-based sensing mechanisms are only useful for the non-chiral discrimination.Here, we propose theoretically and demonstrate experimentally a new type of EP,which is a called radiation vector EP, to fulfill the homogeneous superchiralfields for chiral sensing. This type of EP is realized by suitably tuning thecoupling strength and radiation losses for a pair of orthogonal polarizationmodes in the photonic crystal slab. Based on the unique modal-coupling propertyat the vector EP, we demonstrate that the uniform superchiral fields can begenerated with two beams of lights illuminating on the photonic crystal slabfrom opposite directions. Thus, the designed photonic crystal slab, whichsupports the vector EP, can be used to perform surface-enhanced chiraldetection. Our findings provide a new strategy for ultrasensitivecharacterization and quantification of molecular chirality, a key aspect forvarious bioscience and biomedicine applications.

Vector exceptional points with strong superchiral fields