Sun Yu, Hu Guohua, Cui Yiping
Appl Opt. 2020 Nov 20;59(33):10613-10617. doi: 10.1364/AO.404721.
An all-subwavelength grating waveguide-based sensing structure for figure of merit (FOM) improvement on a silicon-on-insulator platform is proposed and demonstrated. Four racetrack resonators are applied to narrow the spectrum from the drop port of a single racetrack resonator for lower full width at half-maximum, and the FOM is therefore higher through the spectrum-narrowing operation. Numerical simulation and analysis illustrate that the proposed structure is able to raise the FOM more than twice compared to a single racetrack resonator, and a high FOM of 1850.57/refractive index unit is achieved.
提出并展示了一种基于全亚波长光栅波导的传感结构，用于在绝缘体上硅平台上提高品质因数（FOM）。应用四个环形谐振器来缩小单个环形谐振器下降端口的光谱，以降低半高全宽，因此通过光谱窄化操作，品质因数更高。数值模拟和分析表明，与单个环形谐振器相比，所提出的结构能够将品质因数提高两倍以上，并实现了1850.57/折射率单位的高品质因数。
