Ventilative meta-window with broadband low-frequency acoustic insulation
Jinjie Shi, Chenkai Liu, Xiaozhou Liu, Yun Lai
Abstract
Soundproofing ventilation devices can block sound while allowing free airflow simultaneously, which have many important applications in daily lives. In this work, we theoretically design and experimentally implement a broadband low-frequency acoustic meta-window. The meta-window is composed of a central rectangular open area and 12 surrounding identical channels. The total ventilation area is 220 cm2. Interestingly, with a deep subwavelength thickness of 4 cm, such a meta-window can exhibit a large acoustic bandgap, leading to the effective blocking of more than 90% of the incident sound energy in the broad range of 605–1050 Hz. By cascading such acoustic devices, the sound blocking effect can be further improved. Our work realizes a large-area and ultrathin ventilative meta-window with the function of broadband low-frequency acoustic insulation.