Extraordinary acoustic transmission of a decorated window without ventilation

We introduce a kind of acoustic metamaterial, which can greatly enhance the transmission at subwavelength ranges and keep its hyaline and air-proof characteristics simultaneously. In contrast to the state of the art, this originally conceived passive metamaterial makes full use of the resonance of glass plates without any complex or expensive materials. We provide the design of the decorated window, numerical simulation, and experimental demonstrations for this kind of metamaterial and analyze the underlying physical mechanism. Furthermore, we show that more transmission peaks can be realized by introducing multilayer resonance coupling of this decorated window. This meta-window should have many potential applications where both the sound and visible light transmission are required without any ventilation.