A new breakthrough from the Zhang Lab at Boston University is making waves in the world of sound control...making the technology viable in new environments such as factories, offices, and public spaces, where diverse and unpredictable sound frequencies are common and airflow remains essential.
Their latest advance centers on broadband silencing...the use of phase-gradient metamaterials, giving rise to the Phase Gradient Ultra-Open Metamaterial (PGUOM).
“PGUOM takes a smarter approach — more like noise-canceling headphones — effectively silencing a broadband of unwanted sounds,” said Zhang. “It remains highly effective even as the noise shifts in pitch or volume, making it far more practical in dynamic settings like open offices, ventilation systems, or transportation hubs, where sound sources are unpredictable and span a wide range of frequencies.” more
