Highly sensitive poliovirus sensor based on one-dimensional annular photonic crystal with polished cavity
摘要
The present research work introduces a novel biophotonic sensor, specifically designed for the highly sensitive detection of the poliovirus. The integration of MXene with one-dimensional defective annular photonic crystal (DAPC) makes the proposed structure (AB)5CDC(AB)5 capable of minute sensing of poliovirus. The proposed structure consists of two identical APCs (AB)N composed of periodically modulated cylindrical layers A and B of materials silicon dioxide (SiO2) and doped germanium dioxide (GeO2) respectively. These two APCs are separated by a central air core D whose inner walls are coated with two-dimensional MXene material (Ti3C2Tx) C. The working principle of sensor is to detect the minute changes in the refractive index of the sample containing a poliovirus. This minute detection is achieved by displacing the defect peak inside the photonic band gap of the structure due to changes in the refractive index of the sample under consideration. The performance of the biosensor is analyzed by varying the thickness of defect layer D under s polarized light to obtain most suitable defect layer thickness of the structure. Under optimum conditions, our structure yields a maximum shift in the position of the defect mode from 1900 to 1913 nm, corresponding to samples of poliovirus concentrations 0.001 g/ml and 0.050 g/ml of refractive indices 1.330174 and 1.3387 respectively. The results show that our sensor possesses highest sensitivity ranging from 1494.25 nm/nmol/L to 1724.13 nm/nmol/L. The findings of the proposed work may encourage the development of various types of efficient biosensors made up of annular photonic structures.