We presented a novel design of a microring resonator based on a subwavelength grating (SWG) double-slot waveguide (WG) due to its enhanced sensitivity. The paper is divided into two parts. In the first part, we studied and compared the modal characteristics of SWG ridge, single-slot and double-slot WGs. A large value of 0.78 for overlap intensity integration in the upper cladding for SWG double-slot WG is obtained which is a positive sign for designing highly sensitive devices. In the later section, the spectral characteristics of a ring resonator based on the above-mentioned WGs are modelled and spectral characteristics are analyzed. The results demonstrated the clear dominance of a SWG double-slot WG ring resonator over the remaining two WG schemes. At optimized sensor design, the best sensitivity of 840 nm RIU −1 is obtained. To the best of our knowledge, we believe that the sensitivity acquired in this paper is the highest compared to the previously reported values...

中文翻译：

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亚波长光栅双缝波导微环谐振器的高灵敏度设计

由于其增强的灵敏度，我们提出了一种基于亚波长光栅（SWG）双缝波导（WG）的微环谐振器的新颖设计。本文分为两部分。在第一部分中，我们研究并比较了SWG脊线，单槽和双槽WG的模态特征。对于SWG双槽WG，在上覆层中获得的重叠强度积分的最大值为0.78，这对于设计高度敏感的设备是一个积极的信号。在后面的部分中，将对基​​于上述WG的环形谐振器的光谱特性进行建模，并对光谱特性进行分析。结果表明，在其余两个WG方案上，SWG双槽WG环形谐振器具有明显优势。在优化的传感器设计下，可获得840 nm RIU -1的最佳灵敏度。