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Published on: August 30, 2012
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Dual-planar-waveguide sensor with TMDC materials based on Fano resonance
Optics Express
|September 23, 2025
Summary
This study demonstrates a novel Fano resonance sensor using transition metal dichalcogenides in planar waveguides. The sensor achieves high sensitivity for detecting biomolecules in aqueous solutions.
Area of Science:
- Optoelectronics
- Nanotechnology
- Materials Science
Background:
- Fano resonance sensors offer high sensitivity due to their sharp spectral features.
- Transition metal dichalcogenides (TMDs) are promising materials for advanced optical devices.
Purpose of the Study:
- To achieve Fano resonance using few-layer TMDs coated on two planar waveguides.
- To analyze the coupling mechanisms and optimize sensor performance.
Main Methods:
- Fabrication of a sensor structure with two planar waveguides coated with TMDs.
- Analysis of coherent coupling between waveguides with different quality factors.
- Systematic optimization of TMDs (MoS2, WS2, MoSe2, WSe2) for maximum sensitivity.
Main Results:
- Intrinsic loss in TMDs creates waveguides with distinct quality factors, leading to Fano resonance.
- Maximum sensitivities achieved: 9930 RIU⁻¹ (MoS2), 7882 RIU⁻¹ (WS2), 9967 RIU⁻¹ (MoSe2), 8915 RIU⁻¹ (WSe2).
- The sensor effectively detects refractive index changes via Fano line-shape reflectance.
Conclusions:
- The developed Fano resonance sensor exhibits high sensitivity for refractive index sensing.
- This sensor is advantageous for biosensing applications in aqueous environments.
- Coherent coupling of differing quality factors is key to Fano resonance in this system.
