Transfer function asymmetry in Fabry-Perot-based optical pressure sensors

Area of Science:

• Optics and Photonics
• Biomedical Engineering
• Sensor Technology

Background:

• Optical resonators are key for high-performance pressure sensors in photoacoustic imaging.
• Fabry-Perot (FP)-based sensors are widely used but their performance nuances require further study.

Purpose of the Study:

• To investigate the impact of system parameters like beam diameter and cavity misalignment on FP pressure sensor transfer function shape.
• To identify origins of transfer function asymmetry and methods for accurate FP pressure sensitivity estimation.
• To highlight the importance of proper performance assessments for real-world applications.

Main Methods:

• Theoretical analysis of optical resonator behavior.
• Simulation of Fabry-Perot cavity under varying system parameters.
• Experimental validation of theoretical models.

Main Results:

• System parameters significantly influence the transfer function shape and symmetry of FP pressure sensors.
• Asymmetry in the transfer function can lead to inaccurate pressure sensitivity estimations.
• Proper assessment of these parameters is crucial for reliable sensor performance.

Conclusions:

• Understanding the effects of beam diameter and cavity misalignment is essential for optimizing FP pressure sensor design.
• Accurate estimation of FP pressure sensitivity requires careful consideration of experimental conditions.
• This research provides a foundation for developing more robust and reliable optical pressure sensors for photoacoustic imaging.