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High Q-Factor, High Contrast, and Multi-Band Optical Sensor Based on Plasmonic Square Bracket Dimer Metasurface
Bin Ni1, Guanghu Chu1, Zheyang Xu1
1School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Nanomaterials (Basel, Switzerland)
|March 12, 2024
Summary
A novel plasmonic metasurface sensor offers high sensitivity and multiple sensing channels for refractive index and thickness measurements. This resonant metasurface shows great potential for advanced optical sensing and filtering applications.
Area of Science:
- Plasmonics
- Metamaterials
- Optical Sensing
Background:
- Resonant metasurfaces are crucial for optical sensing and filtering.
- Metal-insulator-metal (MIM) structures offer unique optical properties.
Purpose of the Study:
- To propose a high-performance MIM optical sensor using a plasmonic square bracket dimer metasurface.
- To achieve a high quality-factor (Q-factor), multiple operating bands, and high spectrum contrast.
Main Methods:
- Design and simulation of a plasmonic square bracket dimer metasurface.
- Analysis of mode coupling within the metasurface for sensing channel creation.
- Investigation of surface lattice resonance (SLR) mechanism for enhanced sensing.
Main Results:
- Achieved four sensing channels with sensitivities exceeding 200 nm/RIU for refractive index sensing.
- Demonstrated a specific SLR channel with a narrow FWHM of 2 nm, high Q-factor of 548, and high contrast (0.82).
- Validated the sensor's capability for thickness measurement and operation over a wide range.
Conclusions:
- The proposed plasmonic metasurface sensor exhibits excellent performance for refractive index and thickness sensing.
- The multi-band sensor design offers flexibility and potential for further enhancement.
- This resonant metasurface holds significant promise for applications in sensing, monitoring, and filtering.
