Abstract
A high-sensitivity temperature and curvature microfiber Mach-Zehnder interferometer (MMZI) with two peanut-shaped structures is proposed and demonstrated for the first time. The interferometer consists of a section of microfiber and two peanut-shaped structures. The microfiber can be easily affected by the external environment due to its strong evanescent field on the surface and the peanut-shaped structure is conducive to excite fundamental mode to high-order mode, which is beneficial to realize high-sensitivity sensing detection. The experimental results show that the maximum temperature sensitivity of −678.67 pm<inline-formula> <tex-math notation="LaTeX">$/$ </tex-math></inline-formula>°C is obtained in the range of 30 °C to 42 °C, which is the highest temperature sensitivity we have known in the peanut-shaped structure sensor. Furthermore, the sensor is also used for curvature measurements. The curvature sensitivity can be up to −79.09 nm<inline-formula> <tex-math notation="LaTeX">$/\text{m}$ </tex-math></inline-formula><sup>−1</sup> from 0.10188 m<sup>−1</sup> to 0.20374 m<sup>−1</sup>. Therefore, the proposed sensor will have good application prospects in the field of biological detection and environment monitoring due to the advantage of high temperature sensitivity.
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