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Temperature-insensitive optical sensors based on two cascaded identical microring resonators
Optics Letters
|September 1, 2022
Summary
This study presents a novel optical sensor using two cascaded identical microring resonators (CIMRR) for highly sensitive refractive index (RI) detection. The sensor exhibits minimal temperature sensitivity, making it ideal for accurate chemical and biological analysis.
Area of Science:
- Photonics
- Optical Sensing
- Nanotechnology
Background:
- Optical sensors are crucial for detecting chemical and biological analytes.
- Temperature fluctuations can significantly impact sensor accuracy and reliability.
- Existing sensors often require complex temperature compensation mechanisms.
Purpose of the Study:
- To develop a novel temperature-insensitive optical sensor.
- To achieve high sensitivity for refractive index (RI) measurements.
- To utilize cascaded identical microring resonators (CIMRR) for enhanced performance.
Main Methods:
- Designing two identical microring resonators with identical structural parameters.
- Removing upper cladding in sensing windows for sample exposure.
- Utilizing separate microfluidic channels for reference and sample solutions.
- Employing wavelength interrogation and intensity interrogation techniques.
Main Results:
- Achieved RI sensitivities of 3402.4 dB/RIU (wavelength interrogation) and 1087.3 dB/RIU (intensity interrogation).
- Demonstrated low temperature sensitivities of 0.023 dB/K and 0.0124 dB/K, respectively.
- The CIMRR design effectively minimizes thermal drift.
Conclusions:
- The developed CIMRR optical sensor offers a promising solution for accurate RI sensing.
- Its temperature insensitivity enhances reliability in diverse environmental conditions.
- This technology has potential applications in chemical analysis, environmental monitoring, and biomedical diagnostics.
