Pohotonic crystal fiber and pohotonic crystal fiber sensor

Abstract

The invention relates to a pohotonic crystal fiber and a pohotonic crystal fiber sensor. The pohotonic crystal fiber comprises a cladding, a fiber core and at least one air hole; the cross section of the air hole is in a sector shape, the arc-shaped face of the air hole is far away from the fiber core, and the inner wall of the air hole is firstly plated with calcium fluoride thin film and then plated with metal nano thin film. The pohotonic crystal fiber sensor is further provided. The pohotonic crystal fiber and the pohotonic crystal fiber sensor have the advantages that the outer diameter of the pohotonic crystal fiber is 125 micrometers, and therefore operation such as coupling and fusing between fibers in an optical network can be quite conveniently achieved. Filling of the metal nano thin film and to-be-detected microfluid is easily achieved through the large diameter of the air hole, selective film plating is not needed in the operation, and the sensing accuracy is guaranteed. The operation process is simple and rapid, and real-time sensing measurement on environmental media can be achieved. A double-layer film plating operation mode is provided, transmission losses of the pohotonic crystal fiber can be effectively reduced, and the sensing stability and the sensing flexibility are improved.

Description

Technical field [0001] The invention relates to a photonic crystal fiber and a photonic crystal fiber sensor, belonging to the technical field of photonic crystal fiber sensing. Background technique [0002] Since the 1980s, low-loss optical fiber transmission has become a reality, and the use of optical fiber technology for sensing has gradually become a frontier topic in the development of sensor technology. Compared with traditional sensors, optical fiber sensors have the characteristics of small size, light weight, anti-electromagnetic interference, high sensitivity, and easy formation of optical fiber sensing networks. They are used in national defense, communications, industrial production and processing, precision detection of biomedicine, optical network construction, etc. The field shows its strong advantages. [0003] Photonic crystal fiber is also called micro-structure fiber. It usually contains air holes in different arrangements. Therefore, the refractive index distr...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of photonic crystal fiber and photonic crystal fiber sensor, in order to solve the problem that the diameter of the air hole as the microfluid channel is too small, it is difficult to fill the metal nano-coating film and the microfluid to be measured; When the value is large, the loss of the photonic crystal fiber in the measurement band will increase significantly, which is not conducive to the problem of signal transmission

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