Distinction of Acoustically Induced Transparency and Autler-Townes Splitting by Helmholtz Resonators

Abstract

Electromagnetically induced transparency (EIT) and its acoustic analogue (AIT), featuring a transparency window in the transmission spectrum, share similarities with Autler-Townes splitting (ATS), though the intrinsic mechanisms differ. They are usually distinguished only after a device has been built, via a numerical method that does not consider their mechanisms. The authors theoretically, numerically, and experimentally distinguish AIT from ATS with a pair of Helmholtz resonators, finding that one must consider both the usual numerical criterion and the physical mechanisms. This work helps to guarantee AIT or ATS by design, for applications in $e.g.$ sensing, imaging, and filtering.