A selectively excited bimodal interferometer was developed for highly sensitive detection of refractive index changes. Numerical simulation revealed that multimode waveguides with tall, narrow cross-sections are suitable for realizing a highly sensitive bimodal (fundamental and lateral first-order modes) interferometer, owing to deeper penetration of the lateral first-order mode through its side surfaces into the cladding medium. A device with an optimum design was determined by simulation and fabricated by electron-beam lithography using a negative photoresist as the material for the waveguide core. The detection of glucose was demonstrated, and the sensitivity and detection limit was found to be 2547 rad / RIU (RIU—refractive index unit) and 9.8 × 10 − 6 RIU, respectively.

中文翻译：

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选择性激发双峰干涉仪，用于高灵敏度折射率传感

开发了一种选择性激发的双峰干涉仪，用于高度敏感地检测折射率变化。数值模拟表明，由于横向一阶模通过其侧面更深地穿透到包层中，具有高而窄的横截面的多模波导适合于实现高灵敏度的双峰（基本和横向一阶模）干涉仪。中。通过仿真确定具有最佳设计的器件，并使用负性光刻胶作为波导芯的材料，通过电子束光刻技术进行制造。证实了葡萄糖的检测，灵敏度和检测极限分别为2547 rad / RIU（RIU-折射率单位）和9.8×10 -6 RIU。