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Anisotropic Sensing Performance in a High-Sensitivity Surface Plasmon Resonance Sensor Based on Few-Layer Black
Qifeng Zhu1, Yanting Shen1, Zhuo Chen1
1Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China.
Sensors (Basel, Switzerland)
|June 27, 2024
Summary
Few-layer black phosphorus (FLBP) shows promise for surface plasmon resonance (SPR) sensors. Optimizing FLBP stacking sequences significantly enhances sensor performance, with specific arrangements yielding higher sensitivity for improved detection capabilities.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Few-layer black phosphorus (FLBP) possesses unique anisotropic optical and electrical properties, making it suitable for high-sensitivity label-free surface plasmon resonance (SPR) sensors.
- The inherent anisotropy of FLBP, specifically along its zigzag and armchair axes, is often not fully utilized in sensor design.
- Understanding the impact of FLBP's anisotropic characteristics on SPR sensor performance is crucial for advancing sensor technology.
Purpose of the Study:
- To investigate the influence of stacking sequence and layer count of FLBP on SPR reflectivity and phase.
- To theoretically and experimentally analyze the sensing performance of BK7-Ag-FLBP structures with varying FLBP configurations.
- To optimize FLBP-based SPR sensor design by leveraging its anisotropic properties.
Main Methods:
- Theoretical modeling of SPR reflectivity and phase shifts in BK7-Ag-FLBP structures.
- Experimental characterization using Attenuated Total Reflection (ATR) SPR setup to measure reflectivity and phase.
- Angular-resolved polarized Raman spectroscopy (ARPRS) to determine FLBP sample thickness and crystal orientations.
Main Results:
- Theoretical analysis indicated that a 12-layer black phosphorus (BP) structure with zz stacking achieved the highest reflectivity (287.9°/RIU) and phase (1162°/RIU) sensitivities.
- Experimental results demonstrated significant resonant angle shifts (0.275°) and phase variations (34.6°) due to different FLBP stacking sequences.
- The zz stacking sequence exhibited superior sensitivity compared to the ac stacking sequence in both theoretical and experimental studies.
Conclusions:
- The stacking sequence of FLBP layers critically impacts the sensing performance of SPR sensors.
- Harnessing the anisotropic properties of FLBP through optimized stacking can lead to enhanced SPR sensor sensitivity.
- This research paves the way for novel anisotropic 2D material-based SPR sensors with improved detection capabilities.
