Abstract
Abstract We demonstrate a novel integrated optical interferometer which responds to changes in the relative humidity of gaseous samples and to changes in the refractive index of liquid samples. This common-path interferometer, which can be fabricated without any microstructuring process, consists of a planarmonomode (SiO 2 -TiO 2 ) waveguide in which the TE 0 and TM 0 modes are coherently excited; their time-dependent phase difference caused by the interaction with the sample is measured.
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