Design of dual polarized tetra core PCF based plasmonic RI sensor for visible-IR spectrum

Abstract

In this research work, a susceptible refractive index (RI) biosensor has been presented which can operate in visible to near-infrared region, i.e (500–2000 nm) on a tetra core “photonic crystal fiber (PCF)” based on the “surface plasmon resonance (SPR).” The efficiency of the proposed RI sensor is analyzed in terms of “wavelength sensitivity (WS), amplitude sensitivity (AS), sensor resolution (SR), and linearity of the resonance wavelength.” Using amplitude interrogation method, maximum AS of 7200 RIU−1 is obtained for x−polarization and 4725 RIU−1 for y−polarization, respectively. Similarly WS of 5000 nmRIU−1 and 10000 nmRIU−1 is obtained using a wavelength interrogation method for x−andy−polarization, respectively. Maximum SR of 2.00×10−5RIU and 1.00×10−5RIU is obtained for x−polarization and y−polarization, respectively. The maximum WS, AS, and SR are obtained for the analyte having a RI value of 1.335. A linear relation between resonant wavelength and RI produces R2=0.9832 and 0.9761 for x−andy−polarization, respectively.