Highly sensitive dual-function sensor for refractive index and temperature using D-shaped microchannel photonic...

Area of Science:

• Photonics
• Nanotechnology
• Sensor Technology

Background:

• Photonic crystal fibers (PCFs) offer unique light-confining properties.
• Surface Plasmon Resonance (SPR) sensors are crucial for detecting changes in refractive index.
• Accurate temperature sensing is vital across various scientific disciplines.

Purpose of the Study:

• To propose and investigate an ultra-sensitive, dual-functional sensor for simultaneous refractive index (RI) and temperature measurements.
• To leverage a D-shaped microchannel PCF design for enhanced sensing capabilities.
• To explore the potential of gold and magnesium fluoride as plasmonic materials for improved sensor performance.

Main Methods:

• Design and simulation of a D-shaped microchannel PCF sensor.
• Incorporation of gold (Au) and magnesium fluoride (MgF2) as plasmonic materials within the microchannel.
• Integration of a temperature-sensitive fluid for thermal detection.
• Analysis of the interaction between surface plasmon polaritons (SPPs) and evanescent fields.
• Evaluation of sensor performance across a range of RI and temperature values.

Main Results:

• Achieved high sensitivities of 31800 nm/RIU for RI and 49 nm/°C for temperature.
• Demonstrated a broad detection spectrum for RI (1.27-1.43) and temperature (45°C-100°C).
• The sensor design features a simple cladding with three air holes, simplifying fabrication and enhancing coupling.
• Exhibited robustness against minor structural variations, indicating high fault tolerance.

Conclusions:

• The proposed D-shaped microchannel PCF sensor offers a highly sensitive and dual-functional platform for RI and temperature sensing.
• The use of Au and MgF2 as plasmonic materials significantly enhances sensor performance.
• The sensor's stability and broad detection range make it suitable for advanced biochemical sensing and environmental monitoring applications.