Thermal tuning of the interfacial adhesive layer on the band gaps in a one-dimensional phononic crystal

Phononic crystals possess unique acoustic properties due to their artificial periodic structure. They have been used in a wide range of applications such as wave guides, filters, noise suppression, vibration control, etc. In this paper, an analytic model based on the transfer matrix method is established to study the band gaps of P- and SH-waves in a one-dimensional phononic crystal consisting of alternating strips of two different materials bonded by an interfacial adhesive layer. The analysis accounting for the temperature dependent elastic property of the interfacial adhesive layer indicates a different but an effective approach for thermal tuning of the acoustic band structures. It is shown that the first band gap width may decrease over 50% as the temperature increases from 20 °C to 80 °C. These results provide design guidelines for thermal tuning of wave propagation in phononic crystals.