%0 Journal Article
%A Esteban Martínez, Óscar
%A Díaz Herrera, Natalia
%A Navarrete Fernández, María Cruz
%A González Cano, Agustín
%T Surface plasmon resonance sensors based on uniform-waist tapered fibers in a reflective configuration
%D 2006
%@ 1559-128X
%U https://hdl.handle.net/20.500.14352/50956
%X We present a configuration for surface plasmon resonance sensors based on uniform-waist tapered optical fibers and reflective elements. Once the fiber is tapered fulfilling the adiabatic criterion, a multilayer including a metallic medium is asymmetrically deposited on the uniform waist of the fiber. This feature provides the resonant excitation of multiple surface plasma waves. In addition, a mirror is produced at the fiber tip by a chemical Tollens reaction. In this way, the sensor operates in a reflective mode, more convenient for dip probes. When these sensors are spectrally interrogated, a high sensitivity of 10^4 refractive index units per nanometer is attained. These devices can be advantageously used for any kind of chemical sensing and biosensing.
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