Researchers have developed a nano-sized optical fiber that’s sensitive enough to feel the forces generated by swimming bacteria and hear the beating of heart muscle cells. The device, which is about 100 times thinner than a human hair, can detect sounds down to -30 decibels—a level that’s one thousand times below the limit of the human ear. It is at least 10 times more sensitive than the atomic force microscope (AFM), an instrument that can measure infinitesimally small forces generated by interacting molecules. In the future, researchers plan to use the nano fibers to measure bio-activity and the mechanical behavior of single cells, improve the fibers’ “listening” capabilities to create ultra-sensitive biological stethoscopes, and tune their acoustic response to develop new imaging techniques. Read more about this news or go back to the original post here.

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