The tilted fiber Bragg grating based on PMMA for measuring temperature and strain

In this article, we propose a polymer tilted fiber grating (POTFBG) based on polymethyl methacrylate (PMMA) and study its temperature and strain sensing characteristics. Compared to traditional tilted fiber Bragg gratings, this grating exhibits superior temperature and strain sensitivity, along with excellent linearity, significantly enhancing the sensing performance of fiber Bragg gratings. Due to the material properties of PMMA, the observed peak shifts towards shorter wavelengths as the temperature increases. The data indicate that within the temperature range of 10-60°C, its sensitivity can reach -155.8 pm/°C, which is over ten times that of traditional silica single-mode tilted fiber Bragg gratings. The grating is simple to fabricate, highly sensitive, and holds great potential for development as a sensor.