Pressure and temperature sensing with 3D nanoprinted structure integrated on optical fiber

Nanoprinted optical fiber sensors are highly relevant in advanced sensing applications due to their precision, versatility, and ability to operate in compact and challenging environments. In this work, a nanoprinted structure on the fiber tip is employed to measure air pressure and temperature. This nanoscale element forms a dual Fabry-Perot interferometer, enabling high-resolution pressure and temperature monitoring. The analysis of the reflected interference pattern revealed three main frequency components, each processed using band-pass filters to evaluate the sensor response. Pressure measurements exhibited a linear response with a maximum sensitivity of 12 nm/MPa. In contrast, temperature measurements showed non-linear behavior across all interferometers, leading to an analysis in two distinct temperature ranges. The maximum sensitivities achieved were -70.3 pm/°C (from 10 °C to 30 °C), and -347.4 pm/°C (from 30 °C to 50 °C). This approach demonstrates the potential for precise, compact, and highly sensitive pressure and temperature sensors based on nanoprinting technology integrated with optical fibers.