In a breakthrough study published in Science Advances, researchers from the Technical University of Denmark and Universidad Politécnica de Madrid have developed a novel device called an acoustic rainbow emitter (ARE). This innovation can receive broadband white-noise signals from a point source—one that radiates sound equally in all directions—and scatter them so that individual sound frequencies are emitted in different directions.
Much like how a prism disperses white light into a spectrum of colors, the ARE splits sound into its constituent frequencies, producing an “acoustic rainbow.” The concept is inspired by natural hearing systems, such as the complex ears of humans, bats, and dolphins, which have evolved passive structures capable of capturing and shaping sound with remarkable precision.
Despite nature's elegance, replicating this level of broadband acoustic manipulation in artificial systems has proven difficult. Traditional sound control methods rely heavily on active components or resonance-based mechanisms, which are typically limited in bandwidth and spatial flexibility.
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To overcome these challenges, the research team employed computational morphogenesis—a process that combines structural optimization algorithms and finite element analysis to create highly efficient forms. By leveraging tools like topology optimization, advanced wave modeling, and 3D printing, the researchers designed complex, solid-state structures capable of controlling sound in new ways.
They used the Helmholtz equation to simulate how sound waves propagate and scatter in the presence of a rigid, sound-reflecting object. This modeling enabled them to fine-tune the shape of the structure to manipulate how different frequencies are dispersed.
The result is a single-material passive device that can take incoming sound waves and split them into a directional spectrum based on frequency—essentially creating a rainbow of sound. In addition to the ARE, the team also developed a "lambda splitter," which separates low and high-frequency sound waves, sending them in opposite directions.
Both devices function entirely through passive scattering—interactions between the material’s surface and sound waves—with no need for electricity or moving parts. These innovations show that carefully engineered passive structures can control sound with high precision, providing a low-energy alternative to traditional acoustic technologies.