Multimode interference-based highly sensitive strain sensor by illuminating with a Bessel-Gauss beam
2020
By using the concept of multimode-interference, an ultra-high sensitive fiber optic strain sensor is conceptualized theoretically through the use of a Bessel-Gauss beam. In presence of such non-Gaussian beam, effectual coupling of high-order modes within the sensing structure has been affirmed by using the classical wave-optic model. To corroborate our theoretical study, an Eigenmode expansion solver (EME) propagation analysis was conducted in commercially offered Lumerical Mode solution software to analyze the properties of Bessel-Gauss beam propagation within the waveguide system. Our simulation outcome reveals that the projected sensing system has 3.5 times greater sensitivity than the conventional sensor focused on Gaussian beam. In addition, the influence of No-core fiber radius on the sensing performance was also studied in detail. Due to this high-performance feature, the proposed sensing configuration expedites a new avenue in various industrial and process control applications.
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