RT Journal Article T1 Sensing properties of asymmetric double-layer-covered tapered fibers A1 Bueno Guillén, Francisco Javier A1 Esteban Martínez, Óscar A1 Díaz Herrera, Natalia A1 Navarrete Fernández, María Cruz A1 González Cano, Agustín AB A novel, to our knowledge, device based on a tapered optical fiber with a double-layer deposition including a metallic media is presented, and its properties are studied. The main novelty of the device consists of the introduction of a dielectric layer, whereas the systems depicted in the literature are simply metal-coated tapered fibers. The presence of the dielectric layer permits one to tune the response of the device to the refractive index of the surrounding medium. We have proved the suitability of this scheme for refractive-index sensing by depicting two measurement modes, namely, total power attenuation and spectral transmittance. PB The Optical Society Of America SN 1559-128X YR 2004 FD 2004-03-10 LK https://hdl.handle.net/20.500.14352/50967 UL https://hdl.handle.net/20.500.14352/50967 LA eng NO © 2004 Optical Society of America.We thank E. Bernabeu for his valuables comments and suggestions and C. Cosculluela from the Departamento de Física Aplicada of the Universidad de Zaragoza, Spain, for helping us with the devices’ elaboration. This research has been partially supported by European Union project Multiparametric In Situ Spectroscopic Measuring System for Coastal Monitoring, contract EVK3-CT2000-00519, and Spanish project Aplicación de sensores de fibra óptica al control in-situ de parámetros físicos el medio acuático, Programa Nacional de Recursos Naturales, Ministerio de Ciencia y Tecnología, ref. REN 2001-1495. NO European Union NO Ministerio de Ciencia y Tecnología (MCYT), España DS Docta Complutense RD 17 abr 2025