Quantized longitudinal exciton-polaritons in periodic metal-semiconductor nanostructures

► Optical properties of metal-semiconductor 1D photonic crystals are investigated. ► Calculated optical spectra exhibit resonances due to coupling of size-quantized excitons with light. ► For p-polarized light, both transverse and longitudinal polarization waves are excited. ► The position of resonances in the photonic dispersion can be controlled with the metal filling fraction. ► The lowest-frequency gap for TE modes increases with the incidence angle.