Revealing molecular diffusion dynamics in polymer microspheres by optical resonances.

The article presents a study which showed a route to in situ detection of diffusion dynamics in polymer micro-objects by means of optical whispering-gallery mode (WGM) resonances. Topics discussed include characterization of WGM resonances of single microspheres using a confocal microscopic photoluminescence (PL) system, an overview of the full process covering four stages, and sample preparation.