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35 th International Physics Olympiad Pohang, Korea 15 ~ 23 July 2004

35 th International Physics Olympiad Pohang, Korea 15 ~ 23 July 2004. Theoretical Question 3. Theoretical Competition Saturday, 17 July 2004. Theoretical Question 3: “Scanning Probe Microscope”. Objective: To locate a single electron under the surface. V i =c 2 z photo-detector.

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35 th International Physics Olympiad Pohang, Korea 15 ~ 23 July 2004

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  1. 35th International Physics Olympiad Pohang, Korea 15 ~ 23 July 2004 Theoretical Question 3 Theoretical Competition Saturday, 17 July 2004

  2. Theoretical Question 3:“Scanning Probe Microscope” • Objective: To locate a single electron under the surface

  3. Vi=c2z photo-detector output signal lock-in amplifier ref. input laser Vi VR phase shifter piezotube F k piezotube F z=0 m k sample m Cantilever Theoretical Question 3:“Scanning Probe Microscope” • Problem design: Harmonic Waves Hooke’s Law Coulomb’s Law Harmonic Oscillator

  4. Theoretical Question 3:“Scanning Probe Microscope” • Physical concepts required: • Oscillations • Harmonic Oscillations • Harmonic Waves • Resonance • Electricity • Coulomb’s Law • Mechanics • Hooke’s Law • Force Equilibrium

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