Acta Optica Sinica, Volume. 42, Issue 16, 1613001(2022)
Sensing Characteristics of Grating-Assisted Slot Microring Resonator
To improve the sensitivity and quality factor in refractive index sensing, a grating-assisted slot microring resonator is proposed. On the basis of the slot microring, the grating structure is introduced to realize the electromagnetically induced transparency (EIT)-like effect at different wavelengths, and obtain higher sensitivity and higher quality factor. A numerical model for spectrum calculation and parameter optimization of the hole-embedded microring resonator is built by the transfer matrix method. The transmission spectrum of the proposed device structure and electric field distribution of the resonator are simulated using the finite-difference time-domain (FDTD) method, and the influence of device structure parameters is discussed. The results indicate that the proposed device achieves the EIT-like. In the application of refractive index sensing, the quality factor of the proposed device is 35495, and the sensitivity is as high as 360 nm/RIU (RIU is refractive index unit). Compared with the results of the conventional microring resonator with similar parameters, the sensitivity is improved by 270 nm/RIU, and the lower limit of sensitivity detection of the proposed device is 2.3×10-4 RIU.
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Chunjuan Liu, Jiawei Wang, Xiaosuo Wu, Changlin Sang, Ze Qiao, Xiaoli Sun. Sensing Characteristics of Grating-Assisted Slot Microring Resonator[J]. Acta Optica Sinica, 2022, 42(16): 1613001
Category: Integrated Optics
Received: Jan. 5, 2022
Accepted: Mar. 14, 2022
Published Online: Aug. 4, 2022
The Author Email: Wang Jiawei (961695256@qq.com)