A new optical fiber sensor based on surface plasmon resonance is described. It uses an optical fiber with an inverted graded-index profile. A theoretical analysis of the optical propagation when a point light source was used and a computation of the optical power transmitted by the fiber were performed. Experiments were carried out to measure changes of the transmitted power caused by refractive-index variations of the surrounding dielectric medium. Both the simulation and experiments have shown that the sensor exhibits high sensitivity for changes of the surrounding medium in a refractive-index range from 1.33 to 1.39.
© 2002 Optical Society of America
Fabrice Bardin, Ivan Kasik, Alain Trouillet, Vlastimil Matejec, Henri Gagnaire, and Mirek Chomat, "Surface Plasmon Resonance Sensor Using an Optical Fiber with an Inverted Graded-Index Profile," Appl. Opt. 41, 2514-2520 (2002)