detect tiny individual nanoparticles

Engineers develop new sensor to detect tiny individual nanoparticles 

 

Arrays of self-referenced and self-heterodyned Whispering-Gallery Raman microlasers for single nanoparticle detection. A "pump" laser generates a single Raman lasing mode inside the silica resonators. Upon landing of a nanoparticle on the resonator, Raman laser circulating inside the resonator undergo mode splitting leading to two new lasing modes in different colors. Monitoring the changes in the color difference (frequency difference) enables detecting and measuring of nanoparticles with single particle resolution

Read more at: http://phys.org/news/2014-09-sensor-tiny-individual-nanoparticles.html#jCp