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"Whispering gallery" sensors can detect a single nanoparticle. These particles disturb light waves in fiber-taper coupled microresonators. Researchers have created an optical whispering gallery that uses light to interact with a single particle over thousands to millions of times to significantly enhance interactions between the light and the sub-wavelength particle.
The unprecedented sensitivity of this tiny, on-chip device proves to be a big breakthrough in the optical sensing of airborne particles and viruses.Image credit: Nano/Micro Photonics Laboratory, Electrical and Systems Engineering Department, Washington University, Saint Louis
