Abstract
We present experimental evidence of optical Tamm states at the interface of a one-dimensional photonic crystal made of porous Si and hexagonal SiC. This phenomenon occurs in the mid-infrared within the Reststrahlen band where SiC optically behaves as a metal due to phonons. We name the observed interface states Tamm phonon-polaritons by analogy to Tamm plasmon-polaritons at the interface of a photonic crystal and a metal. The high quality factor of the observed resonance makes polar dielectrics attractive materials to achieve Tamm states in the mid-infrared, which could benefit applications such as selective thermal emission and mid-infrared sensing.
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