Sensing Performance Analysis on Quartz Tuning Fork-Probe at the High Order Vibration Mode for Multi-Frequency...

Area of Science:

• Atomic Force Microscopy
• Nanotechnology
• Optical Microscopy

Background:

• Multi-frequency scanning near-field optical microscopy (MF-SNOM) utilizes quartz tuning fork-probe (QTF-p) sensors.
• QTF-p sensors employ in-plane bending modes for simultaneous positional feedback and optical force detection.
• The high mode (2nd in-plane) performance is crucial for tip-sample interaction characterization and high-resolution imaging, yet remains under-researched.

Purpose of the Study:

• Investigate the vibration performance of QTF-p sensors at the high mode.
• Optimize QTF-p sensor design for enhanced high mode sensing capabilities.
• Evaluate the potential of high mode sensing for advanced force detection applications.

Main Methods:

• Experimental characterization of QTF-p sensor vibration using a homemade laser Doppler vibrometer system.
• Finite element method (FEM) analysis to model and understand sensor dynamics.
• Systematic investigation of connecting glue layer properties and probe features influencing dynamic response.

Main Results:

• The high mode exhibits a significant improvement in quality factor (approx. 50%) compared to the low mode.
• QTF-p sensors demonstrate high force sensing sensitivity at the high mode.
• A broad sensing range is achieved at the high mode, suitable for various force sensing applications.

Conclusions:

• The high mode of QTF-p sensors offers superior performance for near-field optical microscopy.
• Optimization of sensor design can further enhance force sensing capabilities.
• High mode sensing in QTF-p sensors shows significant potential for advanced microscopic imaging and force detection.