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Compact Inner-Wall Grating Slot Microring Resonator for Label-Free Sensing
Hongjun Gu1,2, He Gong1,2, Chunxue Wang1
1State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
Sensors (Basel, Switzerland)
|November 23, 2019
Summary
We developed a compact inner-wall grating slot microring resonator (IG-SMRR) for highly sensitive, label-free biosensing. This device offers an ultra-large detection range, overcoming free spectral region limitations for advanced sensing applications.
Area of Science:
- Photonics and optical sensing
- Nanotechnology and microdevices
- Biomedical engineering
Background:
- Label-free sensing is crucial for real-time biological analysis.
- Conventional microring resonators face limitations in detection range and sensitivity.
- Silicon-on-insulator (SOI) platform offers advantages for integrated photonic devices.
Purpose of the Study:
- To present and analyze a novel compact inner-wall grating slot microring resonator (IG-SMRR).
- To enhance the detection range and sensitivity of microring resonators for label-free sensing.
- To explore the potential of IG-SMRR for future ultra-large detection range and ultra-high sensitivity applications.
Main Methods:
- Fabrication of the IG-SMRR on a silicon-on-insulator (SOI) platform with a footprint < 13 μm × 13 μm.
- Integration of a slot microring resonator (SMRR) with an inner-wall grating (IG).
- Characterization of the device's performance, including quasi-free spectral region (FSR), sensitivity, and refractive index (RI) sensing capabilities.
Main Results:
- Achieved an ultra-large quasi-FSR of 84.5 nm, significantly enhancing the detection range.
- Demonstrated concentration sensitivities of 996.91 pm/% for NaCl and 968.05 pm/% for D-glucose.
- Obtained RI sensitivities of 559.5 nm/RIU and 558.3 nm/RIU, respectively.
Conclusions:
- The IG-SMRR offers a substantial improvement in detection range and sensitivity compared to conventional SMRRs.
- The combination of SMRR and IG presents a promising approach for advanced label-free sensing.
- This technology holds potential for future applications requiring ultra-large detection ranges and ultra-high sensitivity.
