Compact Inner-Wall Grating Slot Microring Resonator for Label-Free Sensing
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State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China
2
College of Information Technology, Jilin Agricultural University, 2888 Xincheng Street, Changchun 130118, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(22), 5038; https://doi.org/10.3390/s19225038
Received: 29 September 2019
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Revised: 2 November 2019
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Accepted: 13 November 2019
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Published: 19 November 2019
(This article belongs to the Special Issue Optical–Resonant Microsensors)
In this paper, we present and analyze a compact inner-wall grating slot microring resonator (IG-SMRR) with the footprint of less than 13 μm × 13 μm on the silicon-on-insulator (SOI) platform for label-free sensing, which comprises a slot microring resonator (SMRR) and inner-wall grating (IG). Its detection range is significantly enhanced without the limitation of the free spectral region (FSR) owing to the combination of SMRR and IG. The IG-SMRR has an ultra-large quasi-FSR of 84.5 nm as the detection range, and enlarged factor is up to over 3 compared with the conventional SMRR. The concentration sensitivities of sodium chloride solutions and D-glucose solutions are 996.91 pm/% and 968.05 pm/%, respectively, and the corresponding refractive index (RI) sensitivities are 559.5 nm/RIU (refractive index unit) and 558.3 nm/RIU, respectively. The investigation on the combination of SMRR and IG is a valuable exploration of label-free sensing application for ultra-large detection range and ultra-high sensitivity in future.
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MDPI and ACS Style
Gu, H.; Gong, H.; Wang, C.; Sun, X.; Wang, X.; Yi, Y.; Chen, C.; Wang, F.; Zhang, D. Compact Inner-Wall Grating Slot Microring Resonator for Label-Free Sensing. Sensors 2019, 19, 5038. https://doi.org/10.3390/s19225038
AMA Style
Gu H, Gong H, Wang C, Sun X, Wang X, Yi Y, Chen C, Wang F, Zhang D. Compact Inner-Wall Grating Slot Microring Resonator for Label-Free Sensing. Sensors. 2019; 19(22):5038. https://doi.org/10.3390/s19225038
Chicago/Turabian StyleGu, Hongjun, He Gong, Chunxue Wang, Xiaoqiang Sun, Xibin Wang, Yunji Yi, Changming Chen, Fei Wang, and Daming Zhang. 2019. "Compact Inner-Wall Grating Slot Microring Resonator for Label-Free Sensing" Sensors 19, no. 22: 5038. https://doi.org/10.3390/s19225038
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