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Sensitivity-Enhanced Temperature Sensor Based on PDMS-Coated Mach-Zehnder Interferometer.

Wenlei Yang¹, Le Li¹, Shuo Zhang²

¹College of Information and Intelligence Engineering, Zhejiang Wanli University, Ningbo 315100, China.

Sensors (Basel, Switzerland)

|February 26, 2025

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This study presents a compact Mach-Zehnder interferometer (MZI) temperature sensor coated with polydimethylsiloxane (PDMS) film. The PDMS coating significantly enhances the sensor's temperature sensitivity, achieving -1.06 nm/°C.

Area of Science:

Photonics and Optical Sensing
Materials Science for Sensors
Interferometric Sensing Technologies

Background:

Mach-Zehnder interferometers (MZIs) are widely used for sensing applications.
Enhancing the sensitivity of optical temperature sensors is crucial for various industrial and scientific fields.
Polydimethylsiloxane (PDMS) exhibits favorable thermo-optical properties for temperature sensing.

Purpose of the Study:

To propose and investigate a novel, sensitivity-enhanced temperature sensor.
To leverage the thermo-optical properties of PDMS for improved temperature detection.
To demonstrate the effectiveness of PDMS coating on MZI-based temperature sensors.

Main Methods:

Fabrication of a compact MZI sensor (2.28 mm) by embedding a tapered single-mode fiber (SMF) between two multimode fibers (MMFs).

Keywords:

Mach–Zehnder interferometer fiber-sensing technology polydimethylsiloxane temperature measurement

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Coating the MZI structure with a polydimethylsiloxane (PDMS) film.

Experimental and simulation-based evaluation of the sensor's temperature sensing performance.

Main Results:

The PDMS-coated MZI sensor exhibits enhanced temperature sensitivity compared to uncoated sensors.
Simulations and experiments confirm the improved performance due to PDMS's higher thermo-optical coefficient.
Achieved a high sensitivity of -1.06 nm/°C within the temperature range of -5 °C to 45 °C.

Conclusions:

The proposed PDMS-coated MZI sensor offers a promising solution for high-sensitivity temperature measurement.
The integration of PDMS significantly boosts the thermo-optic effect in the MZI.
This compact sensor design demonstrates practical potential for accurate temperature monitoring applications.