Holographic sensors with nanoparticles to test glucose level


ScienceDaily reports on developing holographic sensors to test glucose level. They are made of a hydrogel (similar to one used in contact lenses), impregnated with tiny silver nanoparticles that after a laser pulse are formed into three-dimensional holograms of predetermined shapes in a fraction of a second. In the presence of certain compounds, such as glucose, alcohol, hormones, drugs, or bacteria, the hydrogels either shrink or swell, causing the color of the hologram to change. Such sensors are cheap, can be fast produced in large volumes, and can be used at home — no more painful blood tests for diabetics.


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