Class modal analysis o a thin multi-trench-assisted liquid-filled optical waveguide coupler for simultaneous multi-sensing applications

Raghuwanshi Sanjeev Kumar; Kumar Manish; Prakash Om

摘要

In this paper, we present an analysis of, to the best of our knowledge, a novel class of the thin multi-trench-assisted optical coupler for multi-sensing of chemical detection. The design structure is an optical waveguide coupler consisting of closely coupled trenches filled with different liquids for chemical sensing. The refractive index profile of the coupler is allowed to vary due to the chemical filled in these trenches. The scalar finite difference method (FDM) is used to analyze the TE (s polarized) as well as TM (p polarized) modes, and thereafter propagate them along the structure through various trenched sections. We excite the structure with the eigenmode profile, which can be well approximated by the Gaussian shape pulse. The trenches with different chemicals and separation between them are well demonstrated in several examples. The main finding of this paper is that the coupling period of the structure can be changed by altering the refractive index of the trench region. In the FDM analysis, we have used the variable discretization step for better accuracy of these results. A new approach based on a thin multi-trench-assisted optical coupler scheme to analyze and design the chemical sensor is then proposed for the first time, to the best of our knowledge, for the detection of adulteration present in, for example, beverages, and in the medical industry. (C) 2018 Optical Society of America

机译：在本文中，我们对我们的知识进行了分析，这是一种新型类别的薄多沟辅助光学耦合器，用于多感测化学检测。设计结构是由填充有不同液体的紧密耦合沟槽的光波导耦合器，用于化学感测。由于这些沟槽中填充的化学物质，允许耦合器的折射率分布变化。标量有限差分方法（FDM）用于分析TE（S偏振）以及TM（P偏振）模式，此后通过各种挖沟部沿着结构传播它们。我们将结构与特征模型突出，其可以通过高斯形状脉冲很好地近似。在几个实例中，具有不同化学品和它们之间的分离的沟槽很好地证明。本文的主要发现是通过改变沟槽区域的折射率来改变结构的耦合周期。在FDM分析中，我们使用了可变离散化步骤以获得这些结果的更好准确性。基于薄的多沟辅助光耦合器方案的一种新方法，然后首次提出了化学传感器，以据我们所知，为了检测，用于检测例如饮料中存在的掺杂物，在医疗行业。（c）2018年光学学会

Class modal analysis o a thin multi-trench-assisted liquid-filled optical waveguide coupler for simultaneous multi-sensing applications

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