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Refractive index sensing characteristics of dual resonance long period gratings in bare and metal-coated D-shaped fibers

机译：裸露和金属包覆D形光纤中双共振长周期光栅的折射率传感特性

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摘要

We present a theoretical study of the ambient refractive index sensing characteristics of long period gratings in bare and metal-coated D-shaped fibers. An equivalent rectangular core waveguide method based on the first-order perturbation theory has been used to study the modal behavior of the waveguide. Power coupling corresponding to dual resonance in both cases has been investigated, and an optimum metal thickness giving maximum sensitivity has been found to exist. The study shows that the dual resonances can be shifted to lower wavelengths by increasing (decreasing) the metal thickness (core to flat surface separation). Further, an optimum combination of metal thickness and core to flat surface separation, corresponding to maximum sensitivity, has been presented for different cladding modes and their relative performance has been discussed. It has been shown theoretically that detection of refractive index changes as small as 1.67 X 10~(-7) RIU in the ambient region is possible using the optimized parameters. The study should find application in realizing highly sensitive biochemical sensors.
机译：我们对裸露的和金属涂覆的D形光纤中的长周期光栅的环境折射率传感特性进行了理论研究。基于一阶扰动理论的等效矩形芯波导方法已用于研究波导的模态行为。已经研究了在两种情况下都对应于双共振的功率耦合，并且发现存在提供最大灵敏度的最佳金属厚度。研究表明，通过增加（减小）金属厚度（芯到平坦的表面间距），可以将双共振移到更低的波长。此外，针对不同的覆层模式，提出了金属厚度和芯部与平面分离的最佳组合（对应于最大灵敏度），并讨论了它们的相对性能。从理论上讲，使用优化参数可以检测到周围区域的折射率变化小至1.67 X 10〜（-7）RIU。该研究应在实现高度敏感的生化传感器中找到应用。

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