title: Fiber optic refractometric sensors using a semi-ellipsoidal sensing element.
abstract: We present theoretical and experimental results for a fiber optic refractometric sensor employing a semi-ellipsoidal sensing element made of polymethyl methacrylate. The double internal reflection of light inside the element provides sensitivity to the refractive index of the external analyte. We demonstrate that the developed sensor, operating at a wavelength of 632 nm, is capable of measurement within a wide range of refractive indices from n=1.00 to n=1.47 with sensitivity over 500 dB/RIU. A comparison of the developed sensor with two more complex refractometric sensors, one based on tapered optical fiber and the other based on suspended-core microstructure optical fiber, is presented.
authors.forename: Amalia Nallely
authors.initials: AN
authors.lastname: Castro Martinez
authors.forename: Matej
authors.initials: M
authors.lastname: Komanec
authors.forename: Tomas
authors.initials: T
authors.lastname: Nemecek
authors.forename: Stanislav
authors.initials: S
authors.lastname: Zvanovec
authors.forename: Sergei
authors.initials: S
authors.lastname: Khotiaintsev