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Nanoscale Imaging of Buried Structures via Scanning Near-Field Ultrasound Holography

Nanoscale Imaging of Buried Structures via Scanning Near-Field Ultrasound Holography G. S. Shekhawat and V. P. Dravid , Science , 310, 89(2005). Journal Club Presentation 30/10/06 Onur Basarir. Background AFM (Atomic Force Microscopy). AFM.

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Nanoscale Imaging of Buried Structures via Scanning Near-Field Ultrasound Holography

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  1. Nanoscale Imaging of Buried Structures via Scanning Near-Field Ultrasound Holography G. S. Shekhawat and V. P. Dravid , Science, 310, 89(2005). Journal Club Presentation 30/10/06 Onur Basarir

  2. BackgroundAFM (Atomic Force Microscopy)

  3. AFM Superb spatial resolution, but nothing about subsurface properties.

  4. Motivation • Near field SPM • Excellent lateral resolution • Ultrasound  Non-destructive and depth sensitive • Holography  Sensitive to phase

  5. 1 - Ultrasonic Force Microscopy O. Kolosov et.al, PRL, 81, 1046 (1998) F. Dinelli,et.al, PRB, 61,13995(2000).

  6. 2 – Acoustic Force Microscopy U. Rabe et.al. ,Ultrasonics, 38, 430(2000).

  7. 3 – Heterodyne Force Microscopy M T Cuberes et al 2000 J. Phys. D: Appl. Phys.33 2347-2355

  8. Drawbacks of these Techniques • Contact mode • Amplitude measurements

  9. Setup

  10. Lock-in f2 f2-f1 f1 Setup for non-contact operation

  11. Results I Nanostructures 500 nm below the surface

  12. Results II

  13. Results III

  14. Results IV

  15. Conclusion • Non-invasive: based on acoustic waves • Sub-surface: transparent to acoustic waves • Nano-scale resolution

  16. Contact AFM

  17. Non-Contact AFM

  18. Tapping Mode AFM

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