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A Reconfigurable Surface-Plasmon-Based Filter/Sensor Using D-Shaped Photonic Crystal Fiber.
S Selvendran1, J Divya1, A Sivanantha Raja2
1School of Electronics Engineering (SENSE), Vellore Institute of Technology, Chennai 600127, Tamil Nadu, India.
Micromachines
|June 24, 2022
Summary
This study introduces a novel D-shaped photonic crystal fiber (PCF) filter/sensor. The device utilizes surface plasmon resonance for polarization filtering and refractive index sensing, achieving high sensitivity for biosensing applications.
Area of Science:
- Photonics
- Plasmonics
- Fiber Optics
Background:
- Photonic crystal fibers (PCFs) offer unique light manipulation properties.
- Surface plasmon resonance (SPR) enables label-free sensing and filtering.
- D-shaped fibers provide a platform for integrating plasmonic materials.
Purpose of the Study:
- To propose and design a reconfigurable surface-plasmon-based filter/sensor.
- To achieve high birefringence and single-polarization filtering using a D-shaped PCF.
- To demonstrate the sensor's capability for refractive index (RI) variation detection.
Main Methods:
- Designing and optimizing a D-shaped PCF structure.
- Coating the fiber with a silver layer to activate plasmon modes.
- Analyzing confinement loss and polarization filtering characteristics.
- Investigating the sensor's response to RI variations.
Main Results:
- Achieved maximum confinement loss of 713 dB/cm at 1.98 µm for X-polarization.
- Demonstrated selective filtering of X-polarization while allowing Y-polarization.
- Observed maximum confinement loss of 426 dB/cm at 1.92 µm for Y-polarization.
- Attenuated Y-polarization completely at 1.92 µm, allowing only X-polarization.
- Proposed sensor detected RI variations from 1.34-1.37 with a sensitivity of 5000 nm/RIU.
Conclusions:
- The proposed D-shaped PCF SPR filter exhibits excellent polarization filtering capabilities.
- The device can be extended into a highly sensitive sensor for RI detection.
- The sensor is suitable for various biosensing and industrial applications requiring precise RI measurements.
