Plasma resonant type optical fiber biosensor based on annular core wave guide

Abstract

The invention provides a plasma resonant type optical fiber biosensor based on annular core wave guide, which consists of a broad band light source, an optical fiber coupler, an optical fiber probe, a detector, an optical spectrometer and a signal processor through being connected, wherein the optical fiber coupler is formed by single mode optical fiber and annular core optical fiber through being coupled, the single mode optical fiber of the optical fiber coupler is connected with the output of the broad band light source, and the annular core optical fiber is connected with the optical fiber probe. The optical fiber probe belongs to an optical fiber probe manufactured by a method comprising the following steps: grinding the annular core single mode optical fiber into a frustum with the designed angle and the designed height; using vacuum evaporation film plating equipment for plating a golden film for depositing a layer of golden film on the surface of the frustum; and carrying out secondary film plating for forming a reflecting film on the end surface of the optical fiber. The invention has the small size, reduces mechanical parts of the biosensor, is suitable for remote distance detection, is convenient for the instrument integration, and can detect the change of the external environment in real time. The invention has higher optical coupling efficiency than the traditional single mode optical fiber. The manufacture of the sensing probe is convenient, and the repetitiveness is good. The detection sensitivity is high, and the test results are stable and reliable.

Description

(1) Technical field [0001] The invention relates to an optical fiber sensor, mainly an optical fiber sensor for biological detection, in particular a plasma resonance optical fiber biological sensor based on a ring core waveguide. (2) Background technology [0002] Surface plasmon resonance (Surface plasmon resonance, SPR) biosensor is the product of the combination of modern physics and biology. At present, commercialized SPR sensing devices mostly work by scanning the incident angle. The entire SPR sensing test system is quite complex and bulky, and the SPR signal is easily affected by external factors such as mechanical structure and light source fluctuations, which greatly limits it. use of the sensor. [0003] The optical fiber surface plasmon resonance sensor is a natural extension of the future SPR sensing technology development and system miniaturization requirements. The research and application of optical fiber SPR sensor is much later than the prism type SPR sen...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the sensitivity and signal-to-noise ratio of the current multimode fiber SPR sensors are not very high, it is difficult to determine the resonant wavelength accurately, the single-mode fiber core diameter is small, the coupling light is weak, and the small size is also difficult to manufacture. It is difficult to obtain a core probe with good quality and high repeatability

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