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.
© 2006 Optical Society of America
Optics at Surfaces
Original Manuscript: February 21, 2006
Revised Manuscript: April 21, 2006
Manuscript Accepted: April 26, 2006
Vol. 1, Iss. 11 Virtual Journal for Biomedical Optics
Óscar Esteban, Natalia Díaz-Herrera, María-Cruz Navarrete, and Agustín González-Cano, "Surface plasmon resonance sensors based on uniform-waist tapered fibers in a reflective configuration," Appl. Opt. 45, 7294-7298 (2006)