Continuous-wave amplitude control via the interference phenomenon in acoustic structures
Abstract
We propose a strategy to continuously tune the amplitude of acoustic waves based on the interference among two mode-conversion paths in passive acoustic structures. The interference phenomenon is attributed to two conjugate acoustic geometric phases obtained with two mode-conversion processes in hybrid-type geometric-phase meta-atom (HGPM) pair. Notably, 100% modulation depth of the wave amplitude is achievable by simply varying the local orientation angle of meta-atom. We utilize the acoustic structure made of two cylindrical resonators to construct deep-subwavelength secondary source with designated initial phase delay, and HGPM supporting desired mode-conversion functionality is accordingly fabricated with four secondary sources. Both theory and experiment consistently verify the continuous amplitude modulation function of HGPM pair, which showcases a general scheme for reconfigurable amplitude-type acoustic meta-devices, i.e., those that require grayscale amplitude modulation for acoustic field engineering.
Cite
@article{arxiv.2410.07529,
title = {Continuous-wave amplitude control via the interference phenomenon in acoustic structures},
author = {Bingyi Liu and Shanshan Liu and Liulin Li and Chuanxing Bi and Kai Guo and Yong Li and Zhongyi Guo},
journal= {arXiv preprint arXiv:2410.07529},
year = {2024}
}
Comments
16 pages, 4 figures