Abstract
By coating a single-mode-multimode-single-mode (SMS) structure with a high refractive index thin-film it is possible to obtain a transition of modes for specific combinations of thin-film thickness, thin-film refractive index and surrounding medium refractive index, which permits to develop devices with a high sensitivity to specific parameters. In order to gain a better knowledge of the phenomenon the experimental results are corroborated numerically with the Transfer-Matrix-Method. The influence of losses in the thin-film has also been studied. The results obtained prove that a thin-film coated SMS structure is a simple and cost-effective platform for development of sensors and optical filters.
Highlights
Single-mode–multimode–single-mode (SMS) fiber is used in important fields such as optical communications and sensors
Due to the phenomenon of multimodal interferometry (MMI) both transmission and attenuation bands are obtained in the optical spectrum
Different transmission and attenuation bands can be observed in the optical spectrum of all devices
Summary
Single-mode–multimode–single-mode (SMS) fiber is used in important fields such as optical communications and sensors. In view of the previous success in combining thin-films with optical structures that are inherently sensitive to the surrounding medium, the application of a thin-film to an SMS structure should lead to interesting results. This idea has been studied theoretically in [20], showing promising results such as the improvement, as a function of coating thickness, of the sensitivity of one of the resonances created in the optical spectrum.
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