Phase modulation and structural effects in a D-shaped all-solid photonic crystal fiber surface plasmon resonance...

Area of Science:

• Photonics
• Optical Sensing
• Biomedical Engineering

Background:

• Surface Plasmon Resonance (SPR) sensors are crucial for detecting biochemical interactions.
• All-solid photonic crystal fibers (PCFs) offer unique light-guiding properties for sensor development.
• D-shaped PCF designs can enhance light-matter interaction for improved sensing.

Purpose of the Study:

• To numerically investigate and propose a high-performance D-shaped all-solid PCF SPR sensor.
• To leverage field leakage and amplified phase shifts for enhanced sensing capabilities.
• To analyze the impact of structural parameters on sensor performance for bioanalysis.

Main Methods:

• Finite Element Method (FEM) for numerical simulation.
• Investigation of field leakage through PCF rod gaps in a side-polished D-shaped fiber.
• Mathematical modeling of structural parameter effects on evanescent field and sensor performance.

Main Results:

• A D-shaped PCF SPR sensor design demonstrating pronounced phase modulation due to field leakage.
• Identification of key parameters (polishing position, pitch, rod diameter) influencing field leakage.
• Development of a model correlating structural variations with sensor performance.

Conclusions:

• The proposed D-shaped PCF SPR sensor design significantly enhances phase shifts for high-performance sensing.
• This design is suitable for detecting a wide range of biochemical interactions.
• The sensor shows promise for in vivo and in situ bioanalysis applications.