The device works by enhancing the signals created by laser light scattered off a sample of a material, which can be as small as one molecule, and identifying the substance by the colors of the reflected light.
The technology is based on Raman scattering, which won its discoverer Chandrasekhara Raman a Nobel Prize in physics, the phenomenon by which the wavelength of a small fraction of light scattered off a molecule is unique to that molecule.
Notably, the device can be produced in large sizes and quantities at much lower prices than previous models despite being a billion times more sensitive.
The research team was led by electrical engineering professor Stephen Chou. The project was funded by the Defense Advanced Research Projects Agency and was published in the journal Optics Express last month.
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