Highly Sensitive All Dielectric Fabry-Perot Etalon Based Perfect NIR Biosensor

A highly sensitive fabry-perot etalon-based perfect biosensor in the near-infrared regime is presented. A perfect reflection dip is obtained due to strong admittance matching with negligible absorption loss within the structure. We analyzed the reflection and transmission spectra using the finitedifference time-domain and the transfer matrix method. Our structure achieved the best sensitivity of $1216.216 ~\mathrm{nmRIU}^{-1}$ with the change in the refractive index of the different analytes. The proposed structure is independent of polarization angles, providing flexibility for design sensors. The proposed structure can pave the way to designing real-time and label-free bio-sensors for chemical and biomedical applications.