NANOCAVITY AND MICROCAVITY BASED PHOTONIC CRYSTAL BIOSENSOR FOR DENGUE DETETCTION

Abstract— Photonic crystal biosensors is a new, advance and  accurate measurement  technology  for  bio  sensing application.  In  this  paper,  a  two  dimensional  (2D) photonic  crystal  nanocavity  and microcavity  sensor  is designed for the detection of dengue using human blood plasma and platelets. The optical  properties of plasma and  platelets  are  observed  and  refractive  index  of normal  plasma,  infected  plasma,  normal  platelets  and infected  platelets  are  used.  The  change  in  output transmission spectrum and Q  factor has been observed with  the  shift  in  wavelength,  thus  by  observing  these changes  dengue  is  detected.  The  designed  sensor  can predict results accurately and  in  short  time, hence  can be used for medical application. By designing micro and Nano cavity in same structure of biosensor, comparison is also done and results of Q factor and transmission are also observed. The band gap range of structure is 1360 nm to 2190 nm and 1550 nm continuous modulated wave is used in this design. The finite difference time domain (FDTD) method is used to analyze the result and Plane wave expansion  (PWE) method  is being used  for band gap calculation.