Cheng, W., Sun, X., Ye, S. , Yuan, B., Sun, Y., Marsh, J. H. and Hou, L. (2023) Sidewall grating slot waveguide microring resonator biochemical sensor. Optics Letters, 48(19), pp. 5113-5116. (doi: 10.1364/OL.502203) (PMID:37773398)
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Abstract
Integrated microring resonator structures based on silicon-on-insulator (SOI) platforms are promising candidates for high-performance on-chip sensing. In this work, a novel sidewall grating slot microring resonator (SG-SMRR) with a compact size (5 µm center radius) based on the SOI platform is proposed and demonstrated experimentally. The experiment results show that the refractive index (RI) sensitivity and the limit of detection value are 620 nm/RIU and 1.4 × 10–4 RIU, respectively. The concentration sensitivity and minimum concentration detection limit are 1120 pm/% and 0.05%, respectively. Moreover, the sidewall grating structure makes this sensor free of free spectral range (FSR) limitation. The detection range is significantly enlarged to 84.5 nm in lab measurement, four times that of the FSR of conventional SMRRs. The measured Q-factor is 3.1 × 103, and the straight slot waveguide transmission loss is 24.2 dB/cm under sensing conditions. These results combined with the small form factor associated with a silicon photonics sensor open up applications where high sensitivity and large measurement range are essential.
| Item Type: | Articles |
|---|---|
| Additional Information: | This work was supported by the U.K. Engineering and Physical Sciences Research Council (EP/R042578/1). |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Sun, Yiming and Yuan, Bocheng and Hou, Dr Lianping and Cheng, Weiqing and Marsh, Professor John and Sun, Xiao and Ye, Dr Shengwei |
| Authors: | Cheng, W., Sun, X., Ye, S., Yuan, B., Sun, Y., Marsh, J. H., and Hou, L. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | Optics Letters |
| Publisher: | Optica |
| ISSN: | 0146-9592 |
| ISSN (Online): | 1539-4794 |
| Published Online: | 12 September 2023 |
| Copyright Holders: | Copyright © 2023 Optica Publishing Group |
| First Published: | First published in Optics Letters 48(19): 5113-5116 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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