2. Fabrication of plasmonic TFBG immunosensors
The immunosensor developed in our work consists of a TFBG
surrounded by a thin gold sheath to which biomolecules are
grafted.
TFBGs correspond to a refractive index modulation angled by a
few degrees relative to the perpendicular to the propagation axis
(inset of Fig. 1). In addition to the self-backward coupling of the
core mode at the Bragg wavelength, TFBGs redirect some light to
the cladding whose diameter is so large that several tens of
cladding modes can propagate, each with its own effective refractive
index neff,clad. The phase matching condition for the ith
cladding mode resonance is given by λclad,i¼(neff,coreþneff,clad,i)Λ
2. Fabrication of plasmonic TFBG immunosensorsThe immunosensor developed in our work consists of a TFBGsurrounded by a thin gold sheath to which biomolecules aregrafted.TFBGs correspond to a refractive index modulation angled by afew degrees relative to the perpendicular to the propagation axis(inset of Fig. 1). In addition to the self-backward coupling of thecore mode at the Bragg wavelength, TFBGs redirect some light tothe cladding whose diameter is so large that several tens ofcladding modes can propagate, each with its own effective refractiveindex neff,clad. The phase matching condition for the ithcladding mode resonance is given by λclad,i¼(neff,coreþneff,clad,i)Λ
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