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Enhanced optical sensing performance in stacked resonant compound gratings
Optics Express
|October 7, 2021
Summary
A novel stacked resonant compound grating (SRCG) optical sensor demonstrates high sensitivity for biosensing applications. Its spectral width is tunable by adjusting structural parameters, enabling precise detection.
Area of Science:
- Photonics
- Nanotechnology
- Biosensing
Background:
- Integrated optical sensors are crucial for real-time monitoring.
- Grating structures offer unique optical properties for sensing.
Purpose of the Study:
- To propose and investigate a high-performance integrated optical sensor.
- To explore the tunable spectral characteristics of a stacked resonant compound grating (SRCG).
Main Methods:
- Theoretical modeling combining coupled mode theory and eigenmode analysis.
- Investigating the effect of structural parameters (strip depth, period, cavity length) on spectral width.
- Finite Element Method (FEM) simulations for verification.
Main Results:
- The spectral width of the SRCG is controllable via structural parameters.
- Achieved a high sensitivity of 401.8 nm/RIU.
- Obtained a high figure of merit (FOM) of 57404.
Conclusions:
- The proposed SRCG sensor offers tunable spectral properties.
- The sensor exhibits excellent performance metrics for high-sensitivity detection.
- This technology shows significant promise for advanced biosensing applications.
