Broadband Reflective Elastic Mode Conversion Enabled by a Single Row of Inclined Long-Slits
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.
Keywords
Cite
@article{arxiv.2511.19839,
title = {Broadband Reflective Elastic Mode Conversion Enabled by a Single Row of Inclined Long-Slits},
author = {Kaifei Feng and Weidong Wang and Yucheng Gao and Fengming Liu and Qiujiao Du and Wenshuai Zhang and Pai Peng},
journal= {arXiv preprint arXiv:2511.19839},
year = {2025}
}