Single particle detection and self-trapping in hollow photonic crystal cavities integrated in a microfluidic environment

We demonstrate a functional microfluidic hollow photonic crystal cavity chip for single particle detection and optical manipulation. The use of a very thin PDMS membrane atop hollow photonic crystal cavities devices allows accurate monitoring of in-situ cavity-particle interaction as well as particle manipulation simultaneously. The dynamic resonance frequency shift of a particle inside the cavity region is experimentally and theoretically demonstrated. Evidences of a self-trapping of the particle in the resonant field are presented.