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Eigenvalue equation and core-mode cutoff of weakly guiding tapered fiber as three layer optical waveguide and used as biochemical sensor

机译：弱导锥形光纤作为三层光波导并用作生化传感器的本征值方程和芯模截止

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摘要

The core-mode cutoff plays a major role in evanescent field absorption based sensors. A method has been proposed to calculate the core-mode cutoff by solving the eigenvalue equations of a weakly guiding three layer optical waveguide graphically. The variation of normalized waveguide parameter (V) is also calculated with different wavelengths at core-mode cutoff. At the first step, theoretical analysis of tapered fiber parameters has been performed for core-mode cutoff. The taper angle of an adiabatic tapered fiber is also analyzed using the length-scale criterion. Secondly, single-mode tapered fiber has been developed to make a precision sensor element suitable for chemical detection. Finally, the sensor element has been used to detect absorption peak of ethylenediamine. Results are presented in which an absorption peak at 1540 nm is observed.
机译：核心模式截止在基于消逝场吸收的传感器中起主要作用。提出了一种通过以图形方式求解弱导三层光波导的特征值方程来计算芯模截止的方法。在芯模截止时，还用不同的波长来计算归一化波导参数（V）的变化。第一步，已对纤芯模式截止进行了锥形光纤参数的理论分析。绝热锥形纤维的锥角也使用长度尺度标准进行了分析。其次，已经开发出单模锥形光纤，以使之适合于化学检测的精密传感器元件。最后，该传感器元件已用于检测乙二胺的吸收峰。给出结果，其中观察到在1540nm的吸收峰。

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