To obtain the strain sensing for the high sensitivity PCF (Photonic Crystal Fibers), the high refractive index mixture is infiltrated into the air hole of the PCF. In this paper, we propose to adjust the infiltrated length of the air hole in order to make the loss maximum. The goal is to realize the PCF sensor with high sensitive strain. The experimental results show that the strain sensitivity is about 4.36 pm / μ ε when the infiltrated length is 30mm and the refractive index of the liquid is 1.5. The experimental results are consistent with the simulation ones. This kind of device can apply to the ultrasensitive strain sensing.
Optical fiber-tip air bubbles are demonstrated for pressure sensing with ultrahigh sensitivity. The air bubble locates in the end facet of a single mode fiber (SMF) that spliced with a silica tube, which is naturally formed and acts as a compressible Fabry-Pérot interferometer (FPI) cavity when immersing the silica tube into liquid. The proposed device exhibits pressure sensitivity of <1000 nm/kPa. This kind of compressible FPI cavity may find potential applications in highly sensitive pressure and/or acoustic sensing.
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