Highly Sensitive Force Sensor Based on High-Q Asymmetric V-Shaped CaF₂ Resonator

Area of Science:

• Optics
• Materials Science
• Sensor Technology

Background:

• Whispering gallery mode (WGM) resonators offer high-quality factors and narrow line widths, enabling sensitive detection of external changes.
• Existing WGM resonator applications are limited in force-sensing capabilities.

Purpose of the Study:

• To propose and demonstrate a novel force-sensing system utilizing a high-Q asymmetric V-shaped CaF2 resonator.
• To enhance the deformation of the resonator under force loading by optimizing structural parameters.

Main Methods:

• Designed an asymmetric V-shaped CaF2 resonator with a high-Q factor.
• Employed a dispersion coupling mechanism to link resonator deformation to applied force.
• Investigated the relationship between structural parameters and resonator deformation under force.
• Measured the system's sensitivity and force-sensing resolution.

Main Results:

• The asymmetric V-shaped resonator demonstrated improved deformation under force loading through structural parameter adjustment.
• Achieved a force-sensing sensitivity of 18.84 V/N.
• Determined a force-sensing resolution of 8.49 μN.

Conclusions:

• The proposed force-sensing system based on a WGM resonator offers a viable solution for high-sensitivity force measurements.
• Optimizing the geometry of asymmetric V-shaped resonators enhances their performance in force-sensing applications.