Helical-core fibers have been widely utilized for various applications such as orbital angular momentum manipulation, optical filtering, and sensing. In this work, we demonstrate the sensitivity enhancement of a helical-core fiber by tailoring the resonance wavelength towards the dispersion turning point (DTP) utilizing a post chemical etching process. When the sensor works at different dispersion points, the responses of the device on external parameters, including mechanical torsion, temperature, strain, and external refractive index are investigated and compared. Tailoring the resonance wavelength of the helical-core fiber towards the dispersion turning point in the post chemical etching process significantly enhances the sensitivity to various kinds of parameters, which provides an avenue for modifying and optimizing performances of optical devices.
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