Abstract
In this paper, the influence of mode loss on the feasibility of
grating-assisted optical fiber surface plasmon resonance (SPR) refractive
index (RI) sensors is investigated. The loss of surface plasmon polarition
(SPP) mode plays a key role in the design and implementation of such
sensors. It is demonstrated through simulation that the grating length
should be smaller than or comparable with the propagation length of SPP mode
in order to achieve effective coupling. The loss of SPP mode is the severe
limiting factor for the implementation of the grating-assisted SPR-RI
sensors. More generally, in order to achieve effective mode coupling with
the help of waveguide grating, the grating length is bounded by the shortest
propagation length of the modes in lossy waveguides.
© 2009 IEEE
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