Stanford Engineers Develop Noninvasive Ultrasound Technique to Generate Deep-Tissue Light for Targeted Medical Therapy

Stanford engineers develop a noninvasive way to trigger light deep inside the body using ultrasound and nanoparticles. A breakthrough for cancer and brain therapy.

By: AXL Media

Published: Apr 13, 2026, 8:04 AM EDT

Source: Information for this report was sourced from Stanford University

Bridging the Optical Gap in Deep-Tissue Medicine

A team of researchers at Stanford University has overcome a fundamental limitation in medical physics: the inability of light to penetrate deep into human tissue without invasive procedures. While light is increasingly essential for treating cancers and manipulating neural circuits, it is typically absorbed or scattered by the body’s outer layers, necessitating the use of surgical implants or optical fibers. By publishing their findings in Nature Materials, the team led by Assistant Professor Guosong Hong has demonstrated a roadmap for using ultrasound—which travels easily through soft tissue—to generate precise points of light anywhere in the body. This breakthrough replaces physical hardware with injectable nanomaterials that respond to acoustic pressure.

Converting Mechanical Stress Into Targeted Photons

The core of this technology lies in the use of ceramic nanoparticles that exhibit mechanoluminescence, a property that causes materials to emit light when subjected to mechanical stress. The Stanford team successfully re-engineered these large ceramic particles into biocompatible nanoparticles capable of circulating through the mouse bloodstream. Once distributed via the vasculature, these particles remain dormant and dark until they are struck by focused ultrasound waves. Guosong Hong explains that because blood vessels provide a natural delivery network to every organ, the team can effectively use the body’s own circulatory system to position light sources in the brain, gut, or spinal cord on demand.

Neural Manipulation and Behavioral Outcomes

To validate the efficacy of the light emission, the researchers conducted experiments involving optogenetics, the use of light to control genetically modified neurons. By equipping mice with small ultrasound-emitting devices, the team was able to generate light within specific regions of the brain. The resulting light emission stimulated neurons responsible for movement, causing the mice to turn left or right depending on the precise focal point of the ultrasound. This demonstration proves that ultrasound-generated light is intense and precise enough to trigger complex biological responses without the need for a single incision or a permanent brain implant.