Flannery, D.James, Stephen W.Tatam, Ralph P.Ashwell, Geoffrey J.2011-09-082011-09-081997-04-150146-9592http://dx.doi.org/10.1364/OL.22.000567http://dspace.lib.cranfield.ac.uk/handle/1826/4908Evanescent coupling between a side-polished single-mode optical fiber and a single-mode, pH-sensitive Langmuir-Blodgett overlay is used to demonstrate an intrinsic fiber-optic pH sensor. The sensor shows a wavelength sensitivity of 18.8 ± 0.8 nm/pH and a transmission sensitivity of 9.7 ± 0.8 dB/pH when operating at 750 nArticle