Angle-insensitive perfect light transmission and absorption in one-dimensional photonic crystal heterostructures

Abstract Perfect light transmission in metamaterials typically experiences a frequency shift as the incident angle of the wave increases, limiting their applicability across wide angles. One-dimensional photonic crystal heterostructures, with elliptic-shaped equi-frequency contours, exhibit angle-in sensitive properties. However, an inevitable blue shift in the optical response still occurs as the incident angle increases. In this work, we present two photonic crystal heterostructures, one of which incorporates the optical phase-change material Sb 2 S 3 . By joining two heterostructures with distinct Zak phases, we achieve perfect light transmission. Specifically, as incident angle of wave increases, the transmission peak can be strictly maintained without a frequency shift by tuning the phase (refractive index) of Sb 2 S 3 . Moreover, by combining the heterostructures with a thin silver film, we demonstrate a Tamm plasmon polariton mode with angle-insensitive properties, facilitating angle-tolerant light absorption. Our work offers an innovative approach to designing highly angle-tolerant and tunable devices, which could be applied in various fields such as telecommunications, sensing, and imaging systems, where maintaining performance across a wide range of incident angles is crucial.