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The separation of wave modes from a signal is possible as long as the modes propagate at different frequencies. The question is how to separate a multi-modal wave propagating at the same frequency into two modes. In this work, it is shown that two modes contained in a single-frequency bi-modal wave can be successfully separated by using an engineered phononic crystal. Specifically, guided elastic wave experiments were performed in a thin aluminum plate in the middle of which a phononic crystal is inserted for mode separation.

Guided waves; mode separation; phononic crystals