Year: 2019
Type: article
Abstract: Conventional acoustic metamaterials feature velocity-momentum coupling and pressure-strain coupling, in analogy to standard materials. $W\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}s$ $m\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}s$, on the other hand, are a class of bianisotropic acoustic metamaterials that exhibit strain-velocity and pressure-momentum couplings, which do not exist in conventional elastic materials. A simple device consisting of two membrane resonators with slightly different decorating platelets, and separated by a sealed air column, not only exhibits the largest Willis coefficient by far, but also complies with the Kramers-Kronig relations demanded by causality.
Source: Physical Review Applied
Authors: Joshua Lau, Suet To Tang, Min Yang, Zhiyu Yang
Institution: Hong Kong University of Science and Technology
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2920859012