Optical biochemical sensor based on spiral runway type interference structure

Abstract

The invention discloses an optical biochemical sensor based on a spiral runway type interference structure. The optical biochemical sensor comprises an input straight waveguide, a first right semicircle waveguide, a first straight waveguide, a first left semicircle waveguide, a second straight waveguide, a second right semicircle waveguide, a third straight waveguide, a second left semicircle waveguide, and an output straight waveguide, wherein the input straight waveguide, the first straight waveguide, the second straight waveguide, the third straight waveguide and the output straight waveguide are all mutually parallel to one another. According to the invention, a double-running way type resonant cavity formed by one spiral waveguide structure is adopted, so that transmission pectra of two running ways are overlapped due to the vernier effect, and a harmonic peak with a wide free spectral region and high sensitivity is obtained; through measuring the shift of the harmonic peak with the high sensibility, the variations of the modal effective refractive indexes inside the waveguides can be obtained, and further information about the refractive indexes and the concentration of an object tested is obtained.

Description

technical field [0001] The invention belongs to the technical field of photobiochemical sensing, and in particular relates to the design of an photobiochemical sensor based on a spiral racetrack interference structure. Background technique [0002] Optical biochemical sensors have been used in many fields of biochemical sensors, and become an important part of today's optical sensor devices, and are widely used in civilian and military fields. How to reduce the structural size of optical biochemical sensor devices to achieve a large detection range and high sensing sensitivity is a key technical issue to realize the miniaturization and practicalization of optical sensor devices. The optical biochemical sensor is a physical or chemical transducer that converts the signal expressed by the biochemical substance to be measured into an electrical signal, and uses modern microelectronics and automated instrumentation technology to reprocess the signal to form a variety of usable b...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an optical biochemical sensor based on a spiral racetrack interference structure in order to overcome the shortcomings of the existing single helical structure and microring resonator structure with small free spectral range and difficulty in miniaturization and portability

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