Reflectionless Optical Routing via Zero-Index Networks

This paper introduces an analytical inverse-design approach for creating optical routers that avoid unwanted reflections and offer flexible functionality. The key innovation is the use of non-Hermitian zero-index networks, which allows for direct algebraic mapping between desired routing behavior and physical parameters, eliminating the need for computationally expensive iterative optimization. This provides a systematic and analytical method for designing advanced light-control devices.