Integrated IR laser system for micro-fluidic detection and analysis

This paper presents a novel integrated infra-red laser system (λ = 1550 nm) for micro and nano-fluidic investigation and analysis. Its principle of detection is based on attenuated total internal reflection from a diffraction grating, which is for a first time adapted and applied to operate with near infra-red laser source. The sensor is integrated in an autonomous micro-fluidic device and realized by unique fabrication technology. An analysis of aqueous solutions of sucrose is performed by the micro-fluidic chip. The response of the diffraction efficiency of the integrated detector is investigated for the strongest diffraction orders and for different light polarizations. A resolution of the sucrose concentration below 1 wt.% is achieved.