Researchers have built a new type of chip that produces ultra-small, earthquake-like vibrations, a breakthrough that could lead to smaller, faster, and more efficient smartphones and other wireless electronics, tells Live Science. The device, called a surface acoustic wave (SAW) phonon laser, generates highly coherent surface acoustic waves—mechanical vibrations that move along the surface of a material much like seismic waves on Earth. These waves already play an essential role in modern electronics, helping phones filter and clean wireless signals with precision.
Conventional SAW systems typically require multiple chips and an external power source to create surface waves. The innovation reported in Nature condenses that functionality into a single chip made by stacking ultrathin layers of silicon, lithium niobate (a piezoelectric crystal that converts electrical signals into mechanical motion), and indium gallium arsenide (a semiconductor that accelerates electrons). This layered design amplifies surface vibrations in a way that parallels how traditional lasers amplify light by bouncing waves between mirrors.
The result is a compact, solid-state system that can generate vibrations at around one gigahertz. The researchers believe they can push frequencies into the tens or even hundreds of gigahertz, far beyond the limits of current SAW devices. At these frequencies, the phonon laser could handle more complex signal processing within a single, efficient chip, reducing the need for separate components that take up space and consume power.
In a smartphone, SAWs convert radio signals into tiny mechanical vibrations to strip out noise before converting them back into usable data. Embedding that capability into a single chip could shrink the radio hardware inside phones, enhance wireless performance, and lower energy use.
The phonon laser’s solid-state design offers a pathway to next-generation wireless hardware that is simpler, smaller, and more power-efficient than today’s multi-chip systems.