A Highly Sensitive Fiber-Optic Microphone Based on Graphene Oxide Membrane

We present a fiber-optic microphone (FOM) based on graphene oxide (GO) membrane in this study. A Fabry-Perot cavity consisting of a single-mode fiber and a piece of GO membrane works as the acoustic sensing structure. Using the GO as the core acoustic sensing component, the fabricating process of the FOM is demonstrated to be simple and efficient. Acoustic tests show that this FOM achieves an average minimum detectable pressure of 10.2 μPa/Hz
^1/2
, while maintaining a linear acoustic pressure response and a flat frequency response in the range of 100 Hz to 20 kHz. These results indicate the excellent suitability of this FOM for acoustic detection in the audible range with high sensitivity and high fidelity.