Journal of Sensors / 2009 / Article / Fig 6

Review Article

Microstructured and Photonic Bandgap Fibers for Applications in the Resonant Bio- and Chemical Sensors

Figure 6

Calculated loss spectra of the fundamental core-guided-mode of a metalized MOF. Loss spectrum (solid curve) features several attenuation peaks corresponding to the excitation of plasmonic modes on the surface of metalized channels filled with aqueous analyte of refractive index 1.33. By changing the analyte refractive index (dotted curve), resonant attenuation peaks corresponding to the points of phase matching between the core-guided and plasmon modes shift. In the insets, energy flux of a core-guided-mode is presented at the two absorption peaks. Spectral position of the peak I is the most sensitive of the two peaks to changes in the analyte refractive index. This is because the corresponding core mode is coupled to a plasmon with a strong presence in the analyte region in contrast to the peak II at which plasmonic mode is predominantly extended into the cladding region.

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