Abstract

We have devised an acoustic one-way frequency up-converter comprising a nonlinear cavity and two different superlattices, for converting acoustic energy into the second harmonic wave with high transmission efficiency in only one particular direction. The resonance in the high-Q cavity significantly enhances the interaction between the acoustic waves and the nonlinear medium, leading to abnormal dependences of efficiency on the incident wave amplitude and the nonlinearity parameters. The performance of the proposed structure is verified by numerically solving the nonlinear acoustic partial-differential-equations for a full transient solution. The results show that the transmission efficiency can be promoted by three orders of magnitude as compared with previous devices of the same size and, moreover, reach its maximum when both the incident wave and the nonlinearity are comparatively weak. The parameter dependence of efficiency as well as the necessary condition under which the designed device works are also investigated. The proposed design helps to remarkably improve the sensitivity and reduce the size for similar acoustic one-way devices, which may benefit the potential application of the resulting devices.

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