文档介绍：448 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 20, NO. 3, MARCH 2002
Surface Plasmon Excitation in Fiber-Optics Sensors:
A Novel Theoretical Approach
Ó. Esteban, R. Alonso, M. C. Navarrete, and A. González-Cano
Abstract—A theoretical method for the study of surface plex plane, which plicated, especially when integral
excitation in metallic layers, as used in fiber-optics sensors, is pre- equations are present, which occurs in the most sophisticated
sented. It is based in the calculation of the propagated fields in models [14].
the waveguide structure and allows us pute the loss of op-
tical power in the fiber (which is the measured parameter) from In this work, we propose a novel theoretical approach, based
energy conservation considerations. The agreement with experi- on the determination of the propagated fields within the struc-
mental data obtained with real sensors is good. The method is con- ture and in the calculation of the loss of the transmitted optical
ceptually simple and can be adapted to different configurations of power, which is the directly measured parameter from the en-
the sensors. ergy balance between the different fields.
Index Terms—Fiber-optics sensors, surface plasmons. The main idea is to begin the calculation with an incident
field that corresponds to the evanescent wave propagating in the
I. INTRODUCTION polished cladding. This field