Theoretical study on the light-propagation property of an optical fiber surface plasmon resonance sensor

Optical fiber surface plasmon resonance(SPR)sensor is easy for miniaturization, which is usually used for developing portable analytical devices and can also be used for remote real-time detection. In this study, a tailor-made optical fiber is used to guide light in a novel optical fiber SPR sensor. Because light propagation within optical fiber is rather complex, experience based sensor design cannot insure its precision. Thus, according to the property of the optical fiber used in this study, a light-propagation model is set up and Fresnel equation is used to educe the relationship between the total reflectance of light and the light wavelength. Finally, theoretical SPR curve is drawn and resonance wavelength is achieved. This study provides an important theoretical base for the design and spectral analysis of this kind of optical fiber SPR sensor.