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Optimization of acoustic coupling for bottom actuated scattering based subsurface scanning probe microscopy.

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Subsurface Scanning Probe Microscopy (SSPM) uses ultrasound and Atomic Force Microscopy (AFM) for nanoscale imaging. A new clamp and acoustic method stabilize the coupling layer, making SSPM practical for hours.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Nondestructive characterization of buried nanoscale structures is crucial for semiconductor defect detection and metrology.
  • Subsurface Scanning Probe Microscopy (SSPM), combining ultrasound and Atomic Force Microscopy (AFM), is a promising technique.
  • High-frequency (>1 GHz) SSPM enables acoustic impedance contrast measurements but faces challenges with sound coupling due to acoustic resonances and tip-sample nonlinearity.

Purpose of the Study:

  • To address the challenge of stable acoustic coupling in high-frequency SSPM.
  • To develop a method for precise control and real-time measurement of the coupling layer thickness.
  • To enhance the practicality, robustness, and reliability of scattering-based SSPM.

Main Methods:

  • Design and implementation of a mechanical clamp for stable acoustic coupling.
  • Development of an acoustic method for real-time measurement of the coupling layer thickness.
  • Utilizing downmixed AFM signals to assess measurement stability.

Main Results:

  • Achieved stable coupling layers with thicknesses of 700 ± 2 nm over 2-4 hour periods.
  • Demonstrated stable AFM signal intensities for over 1 hour.
  • The developed clamp and monitoring method significantly improved SSPM performance.

Conclusions:

  • The mechanical clamp and real-time acoustic monitoring method make scattering-based SSPM practical, robust, and reliable.
  • This advancement enables extended measurement periods of hours for nanoscale subsurface characterization.
  • The technique is vital for improving metrology and defect detection in semiconductor applications.