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A single-mode tunable plasmonic sensor based on an 8-shaped resonator for cancer cell detection
Mohammad Danaie1, Leila Hajshahvaladi2, Elham Ghaderpanah3
1Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran. danaie@semnan.ac.ir.
Scientific Reports
|August 26, 2023
Summary
This study introduces a novel plasmonic structure for high-performance filters and sensors. The proposed design achieves a high Q-factor and sensitivity, showing promise for biosensing applications like cancer cell detection.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Sensors
Background:
- Plasmonic devices offer unique light-matter interaction properties.
- Metal-insulator-metal (MIM) waveguides are crucial for plasmonic applications.
- Developing efficient plasmonic filters and sensors remains an active research area.
Purpose of the Study:
- To design and investigate a novel 8-shaped resonator coupled to MIM waveguides for plasmonic filters and sensors.
- To explore the tunability and performance of the proposed structure.
- To evaluate its potential for biosensing applications.
Main Methods:
- Utilized an 8-shaped resonator coupled to metal-insulator-metal waveguides.
- Employed the finite-difference time-domain (FDTD) method for simulation.
- Investigated the effect of structural parameters on the transmission spectrum.
Main Results:
- Observed two resonance modes supporting plasmonic filtering.
- Achieved a high Q-factor of up to 270 at 1187.5 nm.
- Demonstrated tunable single-mode plasmonic filters and a sensitivity of 1200 nm/RIU for biosensing.
Conclusions:
- The proposed plasmonic structure exhibits excellent performance for filtering and sensing.
- Achieved high sensitivity and Q-factor values surpass most reported sensors.
- The structure is a promising candidate for advanced biosensing, including basal cancer cell detection.
