Abstract
A multimode fiber-optic surface plasmon resonance (SPR) sensor with a MgF2
film as a modulated layer is studied. The fiber-optic SPR sensor is investigated
theoretically, specifically the influence of the dielectric protecting layer, using
a four-layer model. The sensor is then fabricated with the optimal parameters
suggested by the theoretical simulation. The sensor has a high sensitivity in the
analyte refractive index (RI) range of 1.33-1.40. The best sensitivity of 4 464
nm/RIU is achieved in the experiment. The use of dielectric film (MgF2) can not only
modulate the resonance wavelength of the sensor, but also protect the silver film
from oxidation.
© 2011 Chinese Optics Letters
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