Angle‐Independent Fano‐Like Absorption in One‐Dimensional Photonic Crystal Heterostructures Containing Hyperbolic Metamaterials

A one‐dimensional photonic crystal heterostructure integrating metamaterials is employed to achieve angle‐insensitive resonances. The incorporation of hyperbolic metamaterials together with a gold (Au) layer leads to the realization of angle‐insensitive Fano‐like resonances. The design enables strong coupling between topological interface states and Tamm plasmon modes, resulting in sharp, asymmetric absorption features. Numerical analysis confirms that the structure exhibits minimal angular dependence under transverse magnetic polarization, with less than 0.6% spectral shift up to a 90 angle of incidence.