Research On Whispering Gallery Resonance Sensing Technology For Capillary Microreacto

When conducting biochemical analysis using capillary microreactors,it is necessary to monitor the key parameters of the internal environment of the tube to ensure the accuracy and reliability of the analytical results.As a three-dimensional extension of the micro-ring,the micro-tube structure supports the Whispering Gallery Mode(WGM).By exciting the resonant modes of the micro-tube cavity in the capillary microreactor,the internal state of the tube can be analyzed and detected.Therefore,this paper focuses on the key issues of exciting and sensing the WGM of micro-capillary tubes and conducts research on the WGM sensing technology of capillary microreactors.The main contents include:1.Theoretical research on the WGM sensing technology of capillary microreactors,analyzing the WGM mode and optical characteristics of capillary microreactors.For the excitation and sensing detection of the WGM resonance of capillary microreactors,the fiber wedge-end coupling resonance technology with micro-capillaries is proposed,and the coupling resonance principle is explored.A theoretical model for the coupling resonance between the wedge-end and the micro-tube is established.At the same time,the sensing detection mechanism of the WGM resonance of capillary microreactors is studied,and the sensing sensitivity characteristics are analyzed in combination with the micro-tube structure.2.A waveguide wedge-end coupling resonance structure model with micro-tube cavities is constructed.Simulation calculations are performed to study the energy distribution and spectral characteristics of the micro-tube Whispering Gallery Modes and the impact of the wedge-end coupling resonance structure on coupling efficiency and sensing sensitivity for the excitation and sensing detection of the WGM resonance of capillary microreactors.3.A wedge-shaped end fiber is prepared,and an experimental system is set up to compare and analyze the resonance excitation of different coupling structures and the influence of radial modes and detection bands on refractive index sensing sensitivity.The experimental results showed that using a quartz capillary with an outer diameter of 370μm and a wall thickness of 60μm with a wedge-shaped end-face fiber polished at an angle of75°,we achieved a Q value of 6.15×10~3 for WGM coupling resonance excitation,and the refractive index detection sensitivity at the resonant peak of 1574.17nm was 39.50nm/RIU.In summary,this paper focuses on the demand for resonance sensing detection of the internal state of capillary microreactors and conducts theoretical research,simulation,and experimental analysis of resonance sensing technology for capillary microreactors.It proposes using a fiber wedge end-face to excite the WGM resonance of capillary microreactors,and conducts resonance sensing experiments for capillary microreactors.The test and analysis results are of great significance for the internal state detection during biochemical analysis using capillary microreactors in the future.