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Exploiting Thin-Film Properties and Guided-Mode Resonance for Designing Ultrahigh-Figure-of-Merit Refractive Index
Duy Thanh Cu1, Hong-Wei Wu1, Hung-Pin Chen2
1Thin Film Technology Center, Department of Optics and Photonics, National Central University, 300, Chung Da Rd., Chung Li, Taoyuan 32001, Taiwan.
Sensors (Basel, Switzerland)
|February 10, 2024
Summary
This study optimized one-dimensional guided-mode resonance (GMR) gratings for sensing. The enhanced GMR sensor design achieved ultra-high sensitivity and a superior figure of merit, outperforming conventional sensors.
Area of Science:
- Photonics and Nanotechnology
- Optical Sensing Technologies
Background:
- Guided-mode resonance (GMR) gratings are advanced optical devices with significant potential in various sensing applications.
- Developing high-performance and easily manufacturable GMR sensors is crucial for expanding their practical utility.
Purpose of the Study:
- To determine the optimal design parameters for a simple, high-performance one-dimensional GMR grating.
- To investigate the impact of high-refractive-index thin films on GMR grating performance.
Main Methods:
- Optimization of the structural parameters of a one-dimensional GMR grating.
- Numerical simulations to analyze the confinement of electric field energy within the waveguide.
- Evaluation of sensor performance metrics including sensitivity and figure of merit at various incident angles (50°, 60°, and 70°).
Main Results:
- The optimized GMR grating demonstrated exceptional sensitivity of 252 nm/RIU and an ultra-narrow full width at half maximum (2 × 10⁻⁴ nm).
- An ultra-high figure of merit (FOM) of 839,666 was achieved at a 50° incident angle.
- Simulations confirmed superior performance compared to conventional GMR sensors, with potential for broad applicability.
Conclusions:
- The optimized GMR grating design offers a significant advancement in sensing technology.
- The study provides a comprehensive understanding of GMR sensor performance under different operational conditions, paving the way for practical applications.
