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首页> 外文期刊>Journal of Lightwave Technology >Highly Sensitive Refractive Index Sensor Based on Mode Transition in a Dual Resonance Long Period Grating Inscribed Ridge Waveguide
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Highly Sensitive Refractive Index Sensor Based on Mode Transition in a Dual Resonance Long Period Grating Inscribed Ridge Waveguide

机译：基于双共振长周期光栅内嵌脊波导中模式转换的高灵敏度折射率传感器

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摘要

In this paper we are proposing a novel and highly sensitive refractive index sensor based on cladding mode transition in a high index coated ridge waveguide with long period grating written in its core, operating near the dispersion turning point. We have theoretically examined the phenomena of cladding mode transition in the ridge waveguide and optimized the thickness of the high index layer to obtain high refractive index sensitivity. Considering the optimized thickness and the coupling between the core mode and a suitable cladding mode, it is shown that (a) the refractive index sensitivity more than 100 mRIU at bio-sensing refractive index 1.33 and (b) a surface sensitivity as high as 36 nmnm for a thin bio-layer with aqueous solution as the ambient medium can be obtained near the dispersion turning point. In addition, the refractive index sensitivity is found to vary only by 3 mRIU for a 100 nm variation in the width of the ridge waveguide. The proposed device should be a promising development in the field of optical biosensors.
机译：在本文中，我们提出了一种新颖的，高灵敏度的折射率传感器，该传感器基于高折射率涂层脊形波导中的包层模式转换，并在其芯中写入了长周期光栅，并在色散转折点附近工作。我们从理论上研究了脊形波导中的包层模式过渡现象，并优化了高折射率层的厚度以获得高折射率灵敏度。考虑到优化的厚度以及纤芯模式和合适的包层模式之间的耦合，结果表明：（a）在生物传感折射率1.33时折射率灵敏度大于100 mRIU，并且（b）表面灵敏度高达36在分散液转折点附近，可获得以水溶液为环境介质的生物薄层的纳米级。此外，发现对于脊形波导的宽度变化100 nm，折射率灵敏度仅变化3 mRIU。所提出的装置应该是光学生物传感器领域中的有前途的发展。

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