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arXiv · 2511.19839

Broadband Reflective Elastic Mode Conversion Enabled by a Single Row of Inclined Long-Slits

Kaifei Feng·Weidong Wang·Yucheng Gao·Fengming Liu·Qiujiao Du·Wenshuai Zhang·Pai Peng
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Abstract

Broadband longitudinal-to-transverse mode conversion under normal incidence remains difficult to achieve, especially with structurally simple designs. Numerical simulations show that a single periodic row of inclined long-slits near a free surface enables high-efficiency broadband conversion, where the conversion rate exceeds 0.8 across a normalized-frequency range of 0.27 to 0.74, corresponding to a 93.1% relative bandwidth. The broadband response originates from two intrinsic deformation modes of the mass blocks between adjacent inclined slits: a rotational mode and a quadrupole mode. The spectral overlap of these two modes sustains a continuous high-efficiency band. The effect is robust against geometric variations, demonstrating that geometric asymmetry alone offers a minimal yet effective route to broadband elastic-wave mode conversion.

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Kaifei Feng, Weidong Wang, Yucheng Gao, Fengming Liu, Qiujiao Du, Wenshuai Zhang, Pai Peng. 2025-11-25. Broadband Reflective Elastic Mode Conversion Enabled by a Single Row of Inclined Long-Slits. https://arxiv.org/abs/2511.19839

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