Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing
A novel all-pass slot microring resonator (SMRR), intended for label-free optical biosensing based on silicon-on-insulator platforms, is proposed. The sensor consists of a bent asymmetric directional coupler and an asymmetric-slot microring waveguide. The appropriate slot width of 140 nm is identifi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/17/6467 |
| _version_ | 1797493172721418240 |
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| author | Bingyao Shi Xiao Chen Yuanyuan Cai Shuai Zhang Tao Wang Yiquan Wang |
| author_facet | Bingyao Shi Xiao Chen Yuanyuan Cai Shuai Zhang Tao Wang Yiquan Wang |
| author_sort | Bingyao Shi |
| collection | DOAJ |
| description | A novel all-pass slot microring resonator (SMRR), intended for label-free optical biosensing based on silicon-on-insulator platforms, is proposed. The sensor consists of a bent asymmetric directional coupler and an asymmetric-slot microring waveguide. The appropriate slot width of 140 nm is identified by the three-dimensional finite-difference time-domain (3D-FDTD) method for better light–matter interaction in applications. According to numerical calculations, the SMRR sensor with a footprint of 10 µm × 10 µm has a concentration sensitivity of 725.71 pm/% for sodium chloride (NaCl) solutions. The corresponding refractive index sensitivity is 403 nm/RIU (refractive index unit), which is approximately six times greater than that of traditional microring resonator sensors. A low detection limit of 0.129% is also achieved. This SMRR is an excellent candidate for label-free optical biosensors due to its compact structure and excellent sensing capability. |
| first_indexed | 2024-03-10T01:16:12Z |
| format | Article |
| id | doaj.art-80948c2e1a5c4791a9483c3efaa2cefb |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T01:16:12Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-80948c2e1a5c4791a9483c3efaa2cefb2023-11-23T14:08:59ZengMDPI AGSensors1424-82202022-08-012217646710.3390/s22176467Compact Slot Microring Resonator for Sensitive and Label-Free Optical SensingBingyao Shi0Xiao Chen1Yuanyuan Cai2Shuai Zhang3Tao Wang4Yiquan Wang5College of Science, Minzu University of China, Beijing 100081, ChinaCollege of Science, Minzu University of China, Beijing 100081, ChinaCollege of Science, Minzu University of China, Beijing 100081, ChinaCollege of Science, Minzu University of China, Beijing 100081, ChinaCollege of Science, Minzu University of China, Beijing 100081, ChinaCollege of Science, Minzu University of China, Beijing 100081, ChinaA novel all-pass slot microring resonator (SMRR), intended for label-free optical biosensing based on silicon-on-insulator platforms, is proposed. The sensor consists of a bent asymmetric directional coupler and an asymmetric-slot microring waveguide. The appropriate slot width of 140 nm is identified by the three-dimensional finite-difference time-domain (3D-FDTD) method for better light–matter interaction in applications. According to numerical calculations, the SMRR sensor with a footprint of 10 µm × 10 µm has a concentration sensitivity of 725.71 pm/% for sodium chloride (NaCl) solutions. The corresponding refractive index sensitivity is 403 nm/RIU (refractive index unit), which is approximately six times greater than that of traditional microring resonator sensors. A low detection limit of 0.129% is also achieved. This SMRR is an excellent candidate for label-free optical biosensors due to its compact structure and excellent sensing capability.https://www.mdpi.com/1424-8220/22/17/6467slot microring resonatorsilicon on insulatorbiosensorsintegrated optics devices |
| spellingShingle | Bingyao Shi Xiao Chen Yuanyuan Cai Shuai Zhang Tao Wang Yiquan Wang Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing Sensors slot microring resonator silicon on insulator biosensors integrated optics devices |
| title | Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing |
| title_full | Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing |
| title_fullStr | Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing |
| title_full_unstemmed | Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing |
| title_short | Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing |
| title_sort | compact slot microring resonator for sensitive and label free optical sensing |
| topic | slot microring resonator silicon on insulator biosensors integrated optics devices |
| url | https://www.mdpi.com/1424-8220/22/17/6467 |
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