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首页> 外文会议>13th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods >Analysis for the sensitivity optimization of integrated optical evanescent wave sensors with grating couplers
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Analysis for the sensitivity optimization of integrated optical evanescent wave sensors with grating couplers

机译：具有光栅耦合器的集成光学e逝波传感器的灵敏度优化分析

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摘要

The structure composed of a single mode silica-titania slab waveguide on a BK7 glass substrates and a grating coupler embossed at the interface of slab waveguide to ambient is studied. Reported studies are focused on optimization of thickness of the slab waveguide, length of grating period and coupling angle, aiming at maximization of coupling angle homogeneous sensitivity, which is a product of effective index coupling angle sensitivity and slab waveguide homogeneous sensitivity. If effective index coupling angle sensitivity is varying with grating period then it has a local minimum. At this minimum coupling angle homogeneous sensitivity depends only on slab waveguide homogeneous sensitivity and a refractive index of medium where coupling angle is measured. Effective index coupling angle sensitivity is monotonous if is varying with waveguide film thickness. Monotonicity sign depends on grating period. Coupling angle homogeneous sensitivity considered a function of waveguide film thickness may have local maximum. However, depending on grating period, it can also be strictly increasing or decreasing function of waveguide film thickness, depending on a diffraction order, in which case it becomes very high. However in this case, coupling angle is quickly increasing and reaches π/2.
机译：研究了在BK7玻璃基板上由单模二氧化硅-二氧化钛平板波导和在平板波导与环境的界面上压花的光栅耦合器组成的结构。报道的研究集中在优化平板波导的厚度，光栅周期的长度和耦合角，旨在最大化耦合角均匀灵敏度，这是有效折射率耦合角灵敏度和平板波导均匀灵敏度的乘积。如果有效折射率耦合角灵敏度随光栅周期而变化，则它具有局部最小值。在此最小耦合角下，均匀灵敏度仅取决于平板波导均匀灵敏度和测量耦合角的介质的折射率。如果随波导膜厚度而变化，则有效折射率耦合角灵敏度是单调的。单调性符号取决于光栅周期。考虑到波导膜厚度的函数的耦合角均匀灵敏度可能具有局部最大值。但是，取决于光栅周期，也可以严格取决于衍射顺序来增加或减小波导膜厚度的功能，在这种情况下，波导膜厚度变得非常高。然而，在这种情况下，耦合角迅速增大并达到π/ 2。

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