Magnetic field sensing plays a pivotal role in numerous fields of medical, transportation and aerospace. The optical fiber-based magnetic field sensor possesses outstanding characteristics of compactness, long-distance interrogation, low cost and high sensitivity, which has attracted intensive interest.
Ultracompact fiber-tip sensor achieves high sensitivity in magnetic field and temperature measurementsSchematic diagram of the MCF-tip probes for magnetic field and temperature discriminative sensing. Credit: Cong Xiong et al.
A bowl-shaped microcantilever and a microfluid-infiltrated microcavity were printed on two different cores of an MCF via the two-photon polymerization technique, respectively. The microcantilever was incorporated with an iron ball inside the bowl-shaped tip to make it magnetically sensitive, while the microfluid-infiltrated microcavity provided a highly sensitive temperature sensing element.
The proposed 3D printed MCF-tip probes, with the capability of detecting multi-signal on a tiny fiber tip through multi-channels within a single fiber, can provide an ultracompact, sensitive and reliable scheme for discriminative measurement when the sensing space is extremely limited in size. In addition, being able to print probes in an on-demand fashion could accelerate research where MCF-tip printed structure could be easily adapted for use in specialized situations.
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