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Self-referenced refractive index sensor based on double-dips method with bimetal-dielectric and double-groove grating
Optics Express
|March 18, 2022
Summary
This study introduces a self-referenced surface plasmon resonance sensor for precise refractive index measurements. The novel sensor design achieves high sensitivity, crucial for biomolecular detection and chemical testing applications.
Area of Science:
- Optoelectronics
- Nanotechnology
- Chemical Sensing
Background:
- Self-referenced sensors enhance measurement accuracy by mitigating external influences.
- Surface plasmon resonance (SPR) is a sensitive technique for detecting changes in refractive index.
Purpose of the Study:
- To propose a high-sensitivity, self-referenced SPR sensor utilizing Na and Au-ZnS composite gratings.
- To investigate the sensor's performance for refractive index sensing applications.
Main Methods:
- Excitation of three surface plasmon resonances using Transverse Magnetic-polarized light at grating interfaces.
- Angular modulation technique to measure refractive index changes.
- Application of the double-dips method to enhance sensor sensitivity.
Main Results:
- Single-dip sensitivities of 329.41 deg/RIU and 788.24 deg/RIU were achieved.
- The double-dips method yielded an average sensitivity of 1117.65 deg/RIU, with a maximum of 4390 deg/RIU.
- A good figure of merit was obtained despite a larger full width at half maximum.
Conclusions:
- The proposed self-referenced SPR sensor demonstrates high sensitivity and accuracy.
- The sensor shows potential for advanced biomolecular detection and chemical testing.
