Redshift gaps in one-dimensional photonic crystals containing hyperbolic metamaterials

The band gaps of photonic crystals (PCs) play an important role in light manipulation for many applications, such as reflectors, filters, and lasers. In traditional, one-dimensional all-dielectric PCs, as the angle of incidence increases, the gaps are blueshifted in wavelength for both transverse-electric (TE) and transverse-magnetic (TM) polarizations. However, this work predicts and demonstrates that redshifted gaps can be realized in one-dimensional PCs composed of alternating hyperbolic metamaterials and dielectrics for TM polarization, while for TE polarization the gaps remain blueshifted. This property facilitates the design of polarization selectors working in a wide angle range.