Fano refractive index sensor based on runway-type micro-ring resonator

Abstract

The invention discloses a Fano refractive index sensor based on a runway-type micro-ring resonator. The Fano refractive index sensor comprises a linear channel waveguide, two closed runway-type waveguides and a fracture runway-type waveguide, wherein the two closed runway-type waveguides are located at the same side of the linear channel waveguide, and each closed runway-type waveguide comprises a first upper straight channel section and a first lower straight channel section. The first upper straight channel section of each closed runway-type waveguide is coupled with the straight channel waveguide; the fracture runway-type waveguide comprises a second upper straight channel section and a second lower straight channel section; the first lower straight channel section and the second upper straight channel section of each closed runway-type waveguide are coupled to form two sections of lower coupling areas; and a fracture is formed in the part, located between the two lower coupling areas, of the second upper straight channel section. When the liquid refractive index sensor is in use, the input light passes through different paths in the sensor, and finally interferes at the output end to form a sharp Fano line shape, so that a liquid refractive index detection function with high sensitivity, high quality factor and low error is realized.

Description

technical field [0001] The invention relates to a Fano refractive index sensor based on a racetrack microring resonator, belonging to the technical field of light sensing. Background technique [0002] SOI optical sensors have many advantages, such as fast response speed, high stability, anti-electromagnetic interference, low loss, compact structure, etc., and have been applied in many fields, such as drug analysis, food safety inspection, environmental monitoring, etc. [0003] There are many types of SOI sensors such as photonic crystal sensors, Mach-Zed sensors, microring resonator sensors. Among them, the microring resonator sensor has the advantages of compact structure, small size, simple manufacturing process, cascade connection with many integrated optical devices, and easier integration. [0004] At the same time, sensitivity and quality factor are two very important factors for judging the quality of microring resonant sensors. The sensitivity and quality factor o...

AI Technical Summary

Problems solved by technology

[0004] At the same time, sensitivity and quality factor are two very important factors for judging the quality of microring resonant sensors. The sensitivity and quality factor of existing microring resonant sensors have reached the bottleneck stage and need to be further improved to meet higher requirements for use.

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