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Deposition of coatings on long-period fiber gratings: tunnel effect analogy

机译:长周期光纤光栅上涂层的沉积:隧道效应类比

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摘要

The sensitivity of Long-period fiber gratings (LPFGs), coated with high-refractive-index thin film overlays, to the refractive index and the thickness of the overlay, and to the ambient refractive index, can be enhanced with a design based on a two-overlay coating of an LPFG. The first overlay of lower refractive index than the cladding affects the guidance of a cladding mode in the second overlay of higher refractive index than the cladding. This causes a more abrupt cladding modal redistribution than with the deposition of a unique high-refractive-index overlay. The phenomenon is analyzed with a method based on a vectorial analysis of modes and the application of coupled mode theory.
机译:涂有高折射率薄膜覆盖层的长周期光纤光栅(LPFG)对覆盖层的折射率和厚度以及环境折射率的敏感性可以通过基于LPFG的两层涂层。折射率比包层低的第一覆盖层影响折射率比包层高的第二覆盖层中的包层模式的引导。与沉积独特的高折射率覆盖层相比,这会导致更突然的包层模态重新分布。通过基于模式矢量分析的方法和耦合模式理论的应用来分析该现象。

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