BOULDER, Colo., Jan 16, 2026, 02:31 MST
- Researchers unveiled an electrically driven “phonon laser” capable of producing surface vibrations directly on a chip.
- The team claims this method might eliminate the need for bulky wireless filtering parts in phones and other radios.
- Major challenges involve scaling the device to operate at higher frequencies and developing packaging suitable for mass production.
Researchers have developed a chip-scale “phonon laser” capable of producing earthquake-like ripples on a material’s surface—a breakthrough that might one day miniaturize the wireless components inside smartphones and other gadgets. 1
Phones already rely on surface acoustic waves—tiny vibrations that help filter out noisy radio signals—but current designs usually distribute this function across several components. The researchers propose a more compact radio front end, cutting down the number of parts that need to be placed, powered, and shielded inside a handset. 2
The pressure isn’t letting up. Qorvo, a supplier of acoustic filters, notes that next-gen high-end smartphones “demand more filters, with less space,” driven by wireless standards adding bands and wider channels. 3
The new gadget, roughly half a millimeter long and shaped like a bar, is crafted from stacked layers of silicon, lithium niobate, and indium gallium arsenide, according to the researchers. Lithium niobate is “piezoelectric,” meaning it can convert electric fields into motion and vice versa — a handy trait when transforming electricity into precise vibrations. 4
Surface acoustic waves, or SAWs, move along the surface layer of a material instead of passing through it—essentially “soundwaves” that glide across the top, the researchers explained. “SAW devices play a crucial role in many of today’s key technologies,” said Matt Eichenfield, a senior author. He pointed to their use in cell phones, GPS receivers, and radar systems. 5
Eichenfield’s team took inspiration from the workings of a diode laser, replacing light with vibrations. “Imagine it as waves similar to those from an earthquake, but confined to the surface of a tiny chip,” explained lead author Alexander Wendt. 6
The Nature paper detailed the generation of SAWs at 1 gigahertz, achieving an output power of -6.1 dBm—a radio power unit—equivalent to roughly 0.25 milliwatts. The team measured a linewidth below 77 hertz, indicating high frequency purity, and their models suggest even smaller devices operating at 10 GHz could work without an external radiofrequency source to initiate the wave. 7
Researchers are currently targeting the clutter inside today’s radios. Phones “convert radio waves into SAWs and back again multiple times,” explained Eichenfield, who added, “This phonon laser was the last domino standing.” 8
Acoustic filtering has become a major industry. In 2023, Apple announced a multiyear, multibillion-dollar agreement with Broadcom, covering 5G radio frequency components that include “FBAR filters,” a kind of acoustic-wave filter used in smartphones. 9
Moving from a lab prototype to a commercial phone usually isn’t straightforward. The device showed a 36-volt threshold bias in the study, which is far beyond what typical handset power rails deliver. Plus, the team has yet to demonstrate consistent operation at significantly higher frequencies within a mass-producible design.
The researchers also outlined wider applications, ranging from GPS and radar to other wireless systems requiring cleaner signals and more precise timing. Should the method scale effectively, it might move signal-cleaning away from bulky modules and into a single chip.
