Arregui San Martín, Francisco JavierDel Villar, IgnacioRuiz Zamarreño, CarlosZubiate Orzanco, PabloMatías Maestro, Ignacio2018-03-272018-09-0120160925-400510.1016/j.snb.2016.04.015https://academica-e.unavarra.es/handle/2454/28101Here we show an optical refractometer with a giant sensitivity of 304,360 nm per refractive index unit(nm/RIU). This sensitivity corresponds to a resolution of 3.28 × 10−9RIU if a standard optical spectrumanalyzer with a resolution of 1 pm is used. This record sensitivity is obtained by means of a lossy moderesonance (LMR) optical fiber sensor in a surrounding media with refractive index around 1.45. Thisachievement implies that the utilization of the LMR phenomenon opens the door to devices and systemsthat can beat, in terms of sensitivity, those used currently in real-time biomolecular analysis such assurface plasmon resonance (SPR) devices.application/pdfeng© 2016 Elsevier B.V. The manuscript version is made available under the CC BY-NC-ND 4.0 license.D-shaped fiberLossy mode resonanceOptical fiber sensorRefractometerArtículo / ArtikuluaAcceso abierto / Sarbide irekiainfo:eu-repo/semantics/openAccess