Abstract
A photothermally stabilized Fabry-Perot cavity with patterned nanofilm was developed for sensitive photoacoustic gas sensing. The Fabry-Perot cavity with a 100 nm-thick and 2.5 mm-diameter multilayer graphene (MLG) demonstrated a minimum detectable acoustic pressure level as low as ~ 2.2 μPa/Hz1/2. The MLG film was patterned by laser manufacture to reduce the signal fluctuation caused by the environmental pressure. Furthermore, taking advantages of the broadband absorption of graphene, a low-cost single-wavelength heating laser was used as the heating source to photothermally stabilize the operation point of the sensor, which further reduced the sensor signal fluctuation to ~ 1 dB. The stabilized Fabry-Perot cavity demonstrated a minimum detectable concentration of ~ 380 ppb over 100 s average time for C2H2 detection. This photothermally stabilized Fabry-Perot cavity with advantages of high sensitivity, compact size and low cost provides a potential solution to high-performance acoustic detection and photoacoustic gas sensing.
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