Simulation study of formaldehyde sensor based on optical microring resonator
Aiming at the problem of extremely harmful of widely used formaldehyde solution in daily life,a refractive index sensor with high sensitivity and large dynamic range is designd to detect the concentration of formaldehyde solution based on optical microring resonator.Using the waveguide perturbation theory,the waveguide core size that maximizes the sensitivity of the system is determined,simulation calculations are performed using finite elements.It is found that if the relative wavelength shift of 10-5 is detected,the relative refractive index change of 10-4 can be detected,the sensitivity of the sensor can be further improved by the coating removal method.Compared with other methods,the sensitivity of this sensor for detecting formaldehyde solution is greatly improved,which has practical guiding significance for the actual measurement of formaldehyde solution.
microring resonatorrefractive index sensorformaldehydeeffective refractive index
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