Researchers have developed a custom fiber that allows the label-free determination of the size and movement of freely diffusing viruses with dimensions smaller than 20 nanometers. This is in line with the increase in viral diseases and the need for a fast and unambiguous detection of viruses. This novel type of fiber is a nanohole with a diameter of 200 nanometers in the core that extends along the entire fiber. Test viruses floating in water are introduced to this hole and light is coupled into the fiber core. If the light coupled into the capillary hits a virus, a portion of the light is deflected from its direction of propagation (i. e., scattered). Based on this light scattering and using a microscope, the size of the virus can be determined. In addition, the ­movement of a virus can be observed and recorded over a period of up to 10 seconds. Read more about this news or go back to the original post here.

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