Acoustic Optical Fiber Sensor Based on Graphene Oxide Membrane.

Area of Science:

• Materials Science
• Acoustic Engineering
• Nanotechnology

Background:

• Graphene-based acoustic sensors offer promising performance but often involve complex and hazardous fabrication.
• There is a need for acoustic sensing technologies with improved fabrication efficiency and environmental sustainability.

Purpose of the Study:

• To develop a Fabry-Pérot acoustic sensor utilizing a graphene oxide membrane.
• To achieve a simplified and faster fabrication process compared to existing graphene sensors.
• To evaluate the sensor's performance, stability, and potential applications.

Main Methods:

• Fabrication of a Fabry-Pérot sensor incorporating a graphene oxide membrane.
• Characterization of the optical cavity and reflected signal amplitude across a 100 nm wavelength range.
• Testing of the sensor's operational range, signal-to-noise ratio (SNR), and temperature stability up to 90°C.

Main Results:

• The sensor exhibited a constant reflected signal amplitude of 6.8 ± 0.1 dB.
• A wideband operation range from 20 to 100 kHz was achieved.
• A maximum SNR of 32.7 dB was recorded at 25 kHz, with stable performance observed at elevated temperatures.

Conclusions:

• The developed graphene oxide membrane Fabry-Pérot sensor provides a faster and more environmentally friendly fabrication method.
• The sensor demonstrates a wideband operation and good thermal stability, making it suitable for acoustic sensing applications.
• Potential applications include wideband microphones, structural analysis, and imaging systems.