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September 1st, 2014

Raman Whispering Gallery Detects Nanoparticles

Abstract:
A Raman microlaser sensor can detect and count individual particles — including viruses — as small as 10 nm.

Researchers led by Dr. Lan Yang of Washington University achieved Raman lasing in a silica microcavity or whispering gallery.

Within the microcavity, two modes of the beam emitted by the Raman laser circulate in opposite directions. When a particle lands on the ring and scatters energy between these modes, the single Raman lasing line splits into two lasing lines with different frequencies, which can be analyzed to confirm detection.

Source:
photonics.com

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