Scientists at EPFL have created a revolutionary biosensor that doesn’t need a light source—it makes its own glow using quantum tunneling.

By guiding electrons through a nanostructure of gold and aluminum oxide, the sensor emits light and detects molecules at astonishingly small concentrations, down to a trillionth of a gram. With no bulky equipment, it opens the door to powerful, compact diagnostic tools that could be used anywhere, from hospitals to remote environments.

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