Esteban Martínez, ÓscarGonzález Cano, AgustínDíaz Herrera, NataliaNavarrete Fernández, María Cruz2023-06-202023-06-202006-11-011. J. Homola, S. S. Yee, and G. Gauglitz, Sens. Actuators B 54, 3 (1999). 2. K. Kurihara and K. Suzuki, Anal. Chem. 74, 696 (2002). 3. A. A. Kolomenskii, P. D. Gershon, and H. A. Schuessler, Appl. Opt. 39, 3314 (2000). 4. A. Hanning, J. Roeraade, J. J. Delrow, and R. C. Jorgenson, Sens. Actuators B 54, 25 (1999). 5. A. González-Cano, F. J. Bueno, Ó. Esteban, N. Díaz-Herrera, and M. C. Navarrete, Appl. Opt. 44, 519 (2005). 6. J. Villatoro, D. Monzón-Hernández, and E. Mejía, Appl. Opt. 42, 2278 (2003). 7. Ó. Esteban, M. C. Navarrete, A. González-Cano, and E. Bernabeu, Opt. Lasers Eng. 33, 219 (2000). 8. W. Leupacher and A. Penzkofer, Appl. Opt. 23, 1554 (1984).0146-959210.1364/OL.31.003089https://hdl.handle.net/20.500.14352/50953© 2006 Optical Society of America. This work has been partially supported by Spanish government project NESTOR (CTM2004-03899/ MAR) and Community of Madrid project FUTURSEN (S-0505/AMB-0374).A new concept of surface plasmon resonance fiber optic sensor is presented. By tuning the plasmon resonance to a wavelength for which the outer medium is absorptive, a significant variation of the spectral transmittance of the device is produced as a function of the concentration of the analyte. With this mechanism, selectivity can be achieved without the need of any functionalization of the surfaces or the use of recognizing elements, which is a very interesting feature for any kind of chemical sensor or biosensor. Doubly deposited uniform-waist tapered fibers are well suited for the development of these new sensors. Multiple surface plasmon resonance, obtainable in those structures, can be used for the development of microspectrometers based on this principle.engjournal articlehttp://dx.doi.org/10.1364/OL.31.003089http://www.opticsinfobase.orgopen access535OpticsÓptica (Física)2209.19 Óptica Física