Design of an ultra-sensitive bimetallic anisotropic PCF SPR biosensor for liquid analytes sensing
Amit Kumar Shakya, Ayushman Ramola, Surinder Singh, Vien Van
Abstract
In this research work, an anisotropic photonic crystal fiber ( PCF ) biosensor working on a refractive index ( RI ) variation and based on surface plasmon resonance ( SPR ) is presented. Liquid analytes ( LA ) having a RI within the range of 1.340 to 1.380 RIU are investigated from the proposed biosensor. Spectroscopy analysis of LA having RI values of 1.340 RIU , 1.360 RIU , and 1.380 RIU is performed from the developed sensing setup for modeling an ultrasensitive biosensor. The numerical analysis of the sensing parameters for the proposed sensor presents a maximum wavelength sensitivity ( WS ) of 20000 nm / RIU for x- polarization ( x − pol .) and 18000 nm / RIU for y- polarization ( y − pol .), respectively, using the wavelength interrogation technique. Maximum amplitude sensitivity ( AS ) of 2158 RIU −1 and 3167 RIU −1 is obtained for x − pol . and y − pol ., respectively, using the amplitude interrogation technique. Maximum sensor resolution ( SR ) of 5.00 × 10 −6 RIU and 5.55 × 10 −6 RIU is obtained for x − pol . and y − pol ., respectively. The linear relationship of the resonant wavelength ( RW ) with the RI produces R 2 = 0.9972 and R 2 = 0.9978, corresponding to a degree (2) for x − pol . and y − pol ., respectively. The figure of merit ( FOM ) for x − pol . and y − pol . are 93.45 RIU −1 and 105.88 RIU −1 , respectively. The sensing parameters have obtained the maximum value for the LA having a RI value of 1.375 RIU .