Time-transformed spectral analysis for multiparametric sensing using a single antiresonant interferometer

This work explores the potential of spectral composition analysis in the time-transformed domain for multiparametric sensing using a single in-line hollow-core interferometer. By effectively distinguishing between antiresonance guidance and Fabry Perot-induced contributions, this approach allows simultaneous measurement of two independent parameters. The sensor, featuring polyimide coating, was characterized during humidity cycles at varying temperatures by monitoring phase variations in the transformed domain. The distinct sensitivities of antiresonance and Fabry-Perot components allowed the determination of temperature and relative humidity using a multiparametric linear model, achieving good agreement with experimental results and underscoring its robustness for multiparametric sensing applications.