The proposed sensor has the advantages of competitive durability and fast and real-time detection based on the evanescent field
coupling between the OMF and the polymer planar waveguide.
The resonance angle depends on the refractive index contrast near the interface in the evanescent field
. The MX96 SPRi device (IBIS Technologies) monitors the resonance angle continuously over time to detect RI changes in the evanescent field
of selected regions of interest in a field of view of 7.8 x 4.7 mm.
P(0)and Pare respectively, the transmitted power through the fiber without and with an analyte over the removed portion of length L, C is the concentration of solution and [gamma] is the evanescent field
absorption coefficientis defined as:
Ache, "A fiber optic evanescent field
absorption sensor for monitoring organic contaminants in water," Fresenius' Journal of Analytical Chemistry, vol.
Lehmann, "Evanescent field
absorption in a passive optical fiber resonator using continuous wave cavity ring-down spectroscopy," Chemical Physics Letters, vol.
The model neglects the evanescent field
modes in the propagation.
A guided light ray in a bending fiber has evanescent field
that propagates in the cladding.
Here through the ATR prism an evanescent field
was generated, which interacted with the sample, and thereby an eigen mode was excited, provided its wave number equalled that of the evanescent field
The interaction between SAs and the signal light can be directional transmission or evanescent field
Part of the light will penetrate into the upper cladding layer and this portion of light is known as the evanescent field
Plasmon resonance shows itself energetically also on the exterior side of the metallic golden or silver layer through a so called "evanescent field
" (Gang Xu et.