Research On Refractive Index Sensor Based On Dielectric Mode And Air Mode Photonic Crystal Nanofiber Cavity

In recent years,optical microcavity has been widely studied and applied due to its high quality factor and small mode volume.Among them,one-dimensional photonic crystal nanofiber cavity?PCNC?has attracted more and more attention of researchers,and has a wide range of applications in such fields as detectors,filters,modulators,low threshold lasers,optical storage,refractive index sensors and so on.This paper first introduces the research background of one-dimensional photonic crystal nanofiber cavity,and then briefly introduces the theoretical basis and calculation method used in the study of photonic crystal,focusing on the finite-difference time-domain method and plane wave expansion method.Based on the existing research,two novel photonic crystal nanofiber cavities based on dielectric mode and air mode are designed and proposed.The sensing performance of the refractive index sensor based on these two modes is studied by numerical simulation.The main contents and conclusions of this paper are as follows:1)A novel refractive index sensor model based on dielectric mode photonic crystal nanofiber cavity is designed and proposed.The band structure of the sensor is analyzed by plane wave expansion method.The optical properties such as quality factor and mode volume are studied by finite difference time domain method.The sensing of refractive index sensor based on dielectric mode photonic crystal nanofiber cavity is mainly studied The numerical simulation results show that the refractive index sensor has excellent sensing performance,its quality factor can achieve 1.49×10⁷,the sensitivity is 598 nm/RIU,and the sensing performance parameter is as high2)A novel refractive index sensor model based on air mode photonic crystal nanofiber cavity is designed and proposed.The band structure is analyzed by plane wave expansion method.The optical properties such as quality factor and mode volume are studied by finite difference time domain method.The sensing performance of the refractive index sensor based on air mode photonic crystal nanofiber cavity is focused on The numerical simulation results show that the quality factor of the sensor is 7.96×10⁶,the sensitivity is 423 nm/RIU,and the sensing performance parameter is 2.1×106 RIU^-1.