Highrefractionindexglassmicrospheresareusedin detectingandmeasuringanalyteonaresonanceshift ofphotonsorbitingwithinamicrosphere. Thisrelativelynewareasometimescalled whisperingGallerymode(WGM)
Refractionindex1.90-2.00
Sizerange1-100µm
Sphericity98-100%