Research on low-temperature blood tissues detection biosensor based on one-dimensional superconducting photonic crystal

Abstract

This paper presents a one-dimensional superconducting photonic crystal (sc-PhC) refractive index biosensor with high sensitivity which consists of a periodic arrangement of superconductors and semiconductors. The biosensor has high sensitivity and accuracy in the refractive index range of 1.0 to 2.2 RIU below the critical temperature. The resonance wavelength and defect refractive index of the biosensor have a high linear correlation coefficient, and the linear correlation coefficient of all experimental groups in this paper is higher than 0.999. The sensitivity of the biosensor decreases with increasing temperature, and when the external temperature increases from 80K to 134K, the sensitivity decreases from 6.04396μm/RIU to 5.71703μm/RIU gradually. And then, the performance of biosensor in blood component detection is researched by FDTD (finite-difference time-domain) method. The result shows that the sensor has higher sensitivity and shows the same change law in the detection of refractive index changes (1.35RIU-1.47RIU) within a small range such as blood components. When the external temperature is increased from 80K to 134K, the sensitivity of the biosensor gradually decreases from 6.85789μm/RIU to 6.48073μm/RIU.