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Atomically Smooth Gold Microflake-Enabled Fiber-Tip Fabry-Perot Interferometer for Temperature and Pressure Sensing.

Yuqi Zhen¹, Xitao Tu¹, Jiajie Zhu¹

¹State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.

ACS Applied Materials & Interfaces

|July 16, 2023

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This study introduces a novel fiber-tip sensor using gold microflakes for improved temperature and pressure sensing. The new design enhances stability and performance under strain, enabling simultaneous measurements.

Area of Science:

Optoelectronics
Materials Science
Sensor Technology

Background:

Fiber-tip Fabry-Perot interferometer (FPI) sensors are crucial for measurements in confined spaces.
Polycrystalline metal films in traditional sensors are prone to microcracks under strain, degrading performance.

Purpose of the Study:

To develop a robust fiber-tip FPI sensor with enhanced optical quality and stability.
To overcome limitations of traditional metal films in strain-intensive sensing applications.

Main Methods:

Fabrication of an atomically smooth gold microflake (GMF)-enabled fiber-tip FPI sensor.
Utilizing a polydimethylsiloxane (PDMS) spacer for flexibility and a soft lithography technique for a clamped-beam structure.
Employing wavelength demodulation for simultaneous measurements.

Keywords:

fiber-tip Fabry−Perot sensor gold microflake pressure temperature ultrasound

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Main Results:

Achieved a high Q factor of 628 with the GMF-enabled FPI sensor.
Demonstrated stable temperature sensing (28-40 °C) with a sensitivity of 1.74 nm °C⁻¹.
Achieved sensitive pressure sensing (11.48 nm kPa⁻¹) using a PDMS clamped-beam structure.
Successfully demonstrated simultaneous temperature and pressure sensing.

Conclusions:

Atomically smooth GMFs significantly improve the Q factor and strain tolerance of fiber-tip FPI sensors.
The developed sensor offers stable and sensitive performance for both temperature and pressure measurements.
The facile fabrication process allows for miniaturized optical sensor integration.