Researchers at Boston University’s Zhang Lab have unveiled a new sound control technology called the Phase Gradient Ultra-Open Metamaterial (PGUOM). Published in Scientific Reports, the work takes a fresh look at noise reduction by blocking a wide range of sound frequencies without sacrificing airflow. If you’ve ever struggled with noisy office spaces or crowded transport hubs, this could be the solution you’ve been waiting for.
Unlike earlier designs that focused on narrowband sound control for fans and HVAC systems, PGUOM offers a versatile defence against varying noise levels. The design features repeating supercells, each made up of three subwavelength unit cells. Two cells use solid barriers to shift the phase of incoming sound waves, while the third keeps things airy, letting the breeze flow right through. Essentially, the structure turns unwanted sound into surface waves that quickly dissipate.
This adaptable approach means the technology can be customised to meet different frequency ranges and airflow needs. In practice, it works much like noise-cancelling headphones – but for entire rooms or even buildings. Given the health risks linked to prolonged noise exposure, such as hearing loss and stress, designers believe this new metamaterial could greatly improve everyday environments for both people and wildlife.
Looking ahead, the team is now working to integrate PGUOM into a range of products and streamline its manufacturing. Their aim is to provide practical, scalable solutions that quietly enhance our quality of life while keeping the air fresh.
