Abstract
We demonstrate an approach for high-sensitivity temperature and strain measurement in a dual-core As2Se3-PMMA taper with an As2Se3 core diameter of $2.5~\mu \text{m}$ . To improve the sensitivity of temperature and strain measurement, we designed the dual-core As2Se3-PMMA fiber with inorganic As2Se3 cores and organic PMMA cladding and also the even and odd modes to build an interferometer. The variation of the difference between phases of the two modes with respect to wavelength ( $\partial \phi _{d}(\lambda)/\partial \lambda)$ decreases with the As2Se3 core diameter increasing, and consequently, thermally induced and strain-induced change of the difference between phases of the two modes $\phi _{d}(\lambda)$ leads to a large wavelength shift indicating enhancement of the temperature and strain measurement sensitivity. Furthermore, thermally induced longitudinal and transverse forces on the As2Se3 cores further enhance the temperature measurement sensitivity. High sensitivities of 436 pm/°C, −6.23 pm/ $\mu \boldsymbol {\varepsilon }$ and 572 pm/°C, and −3.63 pm/ $\mu \boldsymbol {\varepsilon }$ from the transmission spectra of axis-1 and axis-2 in the dual-core As2Se3-PMMA taper are obtained.
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