News From the Field
Tiny Ring Laser Accurately Detects and Counts Nanoparticles
June 27, 2011
A ring-shaped laser no bigger than a pinprick can accurately detect and count individual viruses, the particles that jumpstart cloud formation or those that contaminate the air we breathe. A particle disturbs the light circulating in the ring, splitting the lasing frequency. This split is a measure of the particle's size.
Washington University in St. Louis
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