Advancing Sensitivity in Guided-Wave Surface Plasmon Resonance Sensor through Integration of 2D BlueP/MoS₂ Hybrid...

Area of Science:

• Nanomaterials Science
• Sensor Technology
• Surface Physics

Background:

• Surface Plasmon Resonance (SPR) sensing, utilizing the Kretschmann configuration, is a key technology for chemical and biological detection.
• SPR sensitivity to refractive index changes enables detection of minute variations in phase, intensity, and resonance angle.
• Conventional SPR sensors face limitations in detecting ultralow refractive index changes due to insufficient sensitivity.

Purpose of the Study:

• To theoretically propose a novel guided-wave SPR (GWSPR) configuration for enhanced sensitivity.
• To investigate the potential of a blue phosphorene (blueP)/MoS2 hybrid structure for improving SPR sensor performance.
• To address the challenge of detecting ultralow refractive index variations in chemical and biological sensing.

Main Methods:

• Theoretical modeling of a guided-wave SPR (GWSPR) configuration.
• Integration of a few-layer blue phosphorene (blueP)/MoS2 hybrid structure onto the GWSPR sensor.
• Analysis of electric field enhancement and sensitivity improvements.

Main Results:

• The proposed blueP/MoS2-based GWSPR sensor demonstrated a high sensitivity of 290°/RIU.
• This represents an approximate 82.4% enhancement in sensitivity compared to conventional gold-based SPR sensors.
• The hybrid structure effectively enhances the electric field, leading to improved sensor performance.

Conclusions:

• The novel blueP/MoS2-based GWSPR configuration offers a significant advancement in SPR sensor sensitivity.
• This enhanced sensitivity addresses the limitations of conventional sensors in detecting ultralow refractive index changes.
• The proposed sensor design holds substantial potential for improving the performance of future chemical and biological sensors.