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Refractive index sensor based on a Tamm Fabry-Perot hybrid resonance
Applied Optics
|June 18, 2021
Summary
This study introduces a novel refractive index sensor utilizing coupled Tamm and Fabry-Perot resonances. The sensor demonstrates high sensitivity and a significant figure of merit for detecting changes in ambient refractive index.
Area of Science:
- Photonics and Nanophotonics
- Optical Sensing Technologies
Background:
- Tamm plasmons and Fabry-Perot resonances are optical phenomena with applications in sensing.
- Existing refractive index sensors often face limitations in sensitivity or operating range.
Purpose of the Study:
- To propose and numerically investigate a highly sensitive refractive index sensor based on hybrid Tamm-Fabry-Perot resonance.
- To explore the sensor's performance, including sensitivity and figure of merit, for potential applications in various spectral domains.
Main Methods:
- Utilizing the resonant coupling of a Tamm state to a Fabry-Perot resonance within a metal film's slits.
- Employing rigorous coupled wave analysis (RCWA) for numerical investigation of sensor performance.
- Investigating the influence of grating geometric parameters on sensor characteristics.
Main Results:
- Achieved a sensitivity of 87 nm/RIU, extendable to 160 nm/RIU with optimized grating parameters.
- Demonstrated a figure of merit around 7.5 RIU⁻¹ over a broad measuring range.
- Confirmed tunability of performance by adjusting grating height and duty cycle.
Conclusions:
- The proposed hybrid resonance sensor offers high sensitivity and a robust figure of merit for refractive index sensing.
- The design's adaptability across spectral ranges makes it suitable for infrared and terahertz photonic components.
- This grating Tamm structure presents a promising platform for advanced optical sensing applications.
