A core-offset hetero structured optical fiber was fabricated and proposed for surface plasmon resonance (SPR) sensor. The hetero structure was constituted by a multimode fiber (MMF), core-offset single mode fiber (SMF), and MMF, which are spliced together by a fusion splicer. The effect of the size of core-offset on the RI sensing performance was studied experimentally. The results show that compared with the traditional MMF-SMF-MMF structure, the sensitivity of the proposed structure can be improved, and the highest sensitivity can reach to 6760.17 nm/RIU when the core-offset is 9 μm. The sensor is easy to fabricate, simple structure.
A macrobending plastic optical fiber (POF) with a multi-notched structure was presented for displacement sensing. The multi-notched structure of the POF was fabricated by an imprinted process. The effects of the structural parameters on the displacement sensing performance were studied experimentally. By changing the multi-notched structure parameters, the displacement sensing performance of the POF probe could be optimized. The repeatability and the hysteresis of the sensor probe were also tested. Experimental results showed that the repeatability and hysteresis of the sensor were good, and a sensitivity of 3.58%/mm was obtained. The sensor is a low cost solution for displacement measurement, which is easy fabrication, simple structure, and intensity modulation at visible wavelength.
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