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Significantly enhanced coupling effect and gap plasmon resonance in a MIM-cavity based sensing structure
Yuan-Fong Chou Chau1, Tan Yu Ming2, Chung-Ting Chou Chao3
1Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, BE1410, Brunei. chou.fong@und.edu.bn.
Scientific Reports
|September 17, 2021
Summary
This study introduces a novel multi-mode plasmonic sensor using silver nanorods and a bus waveguide. The sensor achieves high sensitivity for detecting gases and biochemical analytes, enhancing detection by 177%.
Area of Science:
- Plasmonics
- Nanophotonics
- Sensor Technology
Background:
- Plasmonic sensors offer high sensitivity for detecting analytes.
- Existing sensors face limitations in sensitivity and figure of merit.
- Developing advanced plasmonic structures is crucial for lab-on-chip applications.
Purpose of the Study:
- To design and analyze a high-sensitivity multi-mode plasmonic sensor.
- To investigate the coupling effects for enhanced plasmon resonance.
- To evaluate the sensor's performance for gas and biochemical analysis.
Main Methods:
- Utilized a finite element method (FEM) for detailed analysis.
- Designed a sensor structure with square ring-shaped resonators and silver nanorods.
- Analyzed transmittance properties and electromagnetic field distributions.
Main Results:
- Achieved a high sensitivity of 2473 nm/RIU.
- Obtained a figure of merit (FOM) of 34.18 1/RIU and a quality factor (Q) of 56.35.
- Demonstrated a 177% sensitivity enhancement compared to regular sensors.
Conclusions:
- The designed plasmonic sensor is ideal for lab-on-chip gas and biochemical analysis.
- The structure shows potential for nanophotonic devices.
- The sensor is suitable for detecting various gases and fluids due to its wide refractive index range.
