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High-Sensitivity Goos-Hänchen Shift Sensing via Surface Plasmon Resonance and Beam Displacement Amplification
Qian Li1,2, Enze Xu1,2, Xiaoliang Zhang3
1The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China.
This study introduces a novel sensing method combining surface plasmon resonance (SPR) with beam displacement amplification technology (BDAT) to significantly boost sensitivity for detecting ultra-low concentrations. This enhanced Goos-Hänchen shift sensing achieves an order of magnitude improvement for biomolecular detection.
Area of Science:
- Sensing Technology
- Biomolecular Detection
- Optics
Background:
- Surface plasmon resonance (SPR) is vital for real-time, label-free detection in biomedicine and food safety.
- Conventional SPR struggles with sensitivity and stability for ultra-low concentrations and small analytes.
Purpose of the Study:
- To develop a high-sensitivity sensing method using SPR and beam displacement amplification technology (BDAT).
- To enhance the detection capabilities for ultra-low concentration analytes.
Main Methods:
- Utilized Goos-Hänchen (GH) shift sensing integrated with SPR.
- Incorporated beam displacement amplification technology (BDAT) to amplify GH shifts.
- Performed theoretical and experimental validation.
Main Results:
- Achieved a sensitivity of 3.62 × 104 μm/RIU and a minimum detection limit of 3.10 × 10-5 RIU.
- BDAT amplified GH shifts by at least 12 times, enhancing sensitivity by an order of magnitude.
- Demonstrated superior performance over traditional intensity-based SPR for low-concentration solutions.
Conclusions:
- SPR combined with BDAT offers a highly sensitive and stable platform for detecting biomolecular interactions.
- This enhanced GH shift sensing method significantly improves detection limits for ultra-low concentrations.
- The technology holds promise for applications in clinical diagnostics and broader biomedical fields.
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