Physicists at Umeå University in Sweden, together with researchers in China, have developed a laser made entirely from renewable biomaterials—specifically birch leaves and peanut kernels. This breakthrough could lead to low-cost, environmentally friendly optical tools for medical imaging, diagnostics, and potentially smart design applications.

A Random Laser Made from Nature

Unlike conventional lasers, which rely on synthetic or toxic components, a random laser uses light scattering within irregular materials to produce a diffuse yet powerful beam. This makes it particularly suitable for imaging biological tissues without causing harm. Traditionally, these materials are costly or complex to manufacture, but the Umeå team demonstrated that common organic materials can achieve similar performance.

From Birch Leaves to Carbon Dots

The researchers extracted carbon dots—nanoscale light-emitting particles—from birch leaves. These carbon dots serve as the laser’s active medium, while peanut kernels, cut into small cubes, provide a naturally rough surface that scatters light. Together, they form a system that amplifies and emits light when excited by an external source. Remarkably, the process for creating the carbon dots is a simple, one-step “pressure-cooking” method, making it scalable and sustainable.

Potential Beyond Medical Use

While the main application of this biomaterial-based laser lies in medical imaging and diagnostics, the team envisions further uses. Thanks to its renewability, low cost, and safety, the material could be adapted into optical tags for product authentication—helping verify the origin of luxury goods, packaging, or electronics. Such applications could merge sustainability with security and traceability, areas of growing importance in circular design.

Renewable Materials in Advanced Technology

This project is part of a wider research initiative exploring how local, renewable materials can replace synthetic components in high-tech applications. The same research group previously showed that birch leaves could be used to make organic semiconductors for flexible displays. The new laser technology reinforces the potential of biobased materials to reshape not only optics but also the future of sustainable design.

Source: Umeå University / EurekAlert!
Photos: cme3d