A Novel Birefrigent Photonic Crystal Fiber Surface Plasmon Resonance Biosensor

A numerical analysis of a novel birefringent photonic crystal fiber (PCF) biosensor constructed on the surface plasmon resonance (SPR) model is presented in this paper. This biosensor configuration utilizes circular air holes to introduce birefringence into the structure. This PCF biosensor model shows promise in the area of multiple detection using
$\hbox{HE}_{11}^{\rm x}$
and
$\hbox{HE}_{11}^{\rm y}$
modes to sense more than one analyte. A numerical study of the biosensor is performed in two interrogation modes: amplitude and wavelength. Sensor resolution values with spectral interrogation yielded
$5\times 10^{-5}\ \hbox{RIU}$
(refractive index units) for
$\hbox{HE}_{11}^{\rm x}$
modes and
$6\times 10^{-5}\ \hbox{RIU}$
for
$\hbox{HE}_{11}^{\rm y}$
modes, whereas
$3\times 10^{-5}\ \hbox{RIU}$
for
$\hbox{HE}_{11}^{x}$
modes and
$4\times 10^{-5}\ \hbox{RIU}$
for
$\hbox{HE}_{11}^{y}$
modes are demonstrated for the amplitude interrogation.