Optics and Photonics Society of Iran

This paper presents a particle detection system with an integrated optical fiber Fabry-Perot interferometer (OFFPI) in a micro-fluidic channel, known as cytometry. The theory of sensing is based on variation in the effective optical path length of the OFFPI due to passing particles. The OFFPI is the interrogating component in our optical setup and acts as an edge filter for converting a refractive index-induced wavelength variation into an optical power measurement. This flow cytometer is used in counting of polystyrene beads at telecommunication wavelengths (1500nm-1600nm). Results showed that signal to noise ratio for optofluidic-interrogation system is 4 times more than optofluidic cytometer without the interrogation technique.