This paper reports an integrated optical Young interferometer with a novel structure for biochemical sensing application.Pairs of parallel straight single-mode glass channel waveguides are prepared on a glass substrate by using the micro-optoelectromechanical system(MOEMS) technique and the ion-exchange method.With a sputtering mask a tapered layer of TiO2 is deposited on the middle region of one of each channel pair,leading to a great enhancement of the evanescent field in the covered region based on the t...