The relationships of the resonant wavelength of optical fiber surface plasmon resonance (SPR) sensors to the modulation layer refractive index, thickness and the refractive index of the bulk medium are obtained by using theoretical calculation model of optical fiber SPR sensors under certain conditions, which indicates that resonant wavelength of the sensors is approximately linear with modulation layer thickness. Based on the linear relationship, multiple SPR sensors with different resonant wavelengths can be fabricated in a single optical fiber named as distributed optical fiber surface plasmon resonance sensors (DOFSPRSs). Experimental results are presented, showing that it is practical to fabricate more than one SPR sensors in a single optical fiber.
© 2005 Chinese Optics Letters
Zhenxin Cao, Lenan Wu, and Dayong Li, "Distributed optical fiber surface plasmon resonance sensors," Chin. Opt. Lett. 4, 160-163 (2006)