AFM SMILER Exercise 5-8

Tuning which of the following controller parameter can be helpful to reduce steady state tracking error of a step change in the topography?

• Proportional gain

• Integral gain

• Derivative gain

• Scan speed

Which of the following statement is not true?

• Reducing the scan speed in AFM scan helps better tracking of the topography

• A relatively soft sample tends to deform during AFM imaging

• Having a larger proportional gain is always better for tracking

• Tuning derivative control gain helps improve transient response

Which of the following effects can be used as both sensors and actuators for AFM probe?

• Piezoresistive

• Piezoelectric

• Electrothermal

• Optical beam deflection

Which of the following sensing principles is considered embedded and used in active probes?

• Optical beam deflection

• Laser interferometry

• Piezoresistive sensing

• Astigmatic detection

Which of the following method can only be used for sensing of AC signal?

• Piezoelectric

• Piezoresistive

• Optical beam deflection

• Astigmatic detection

For force distance curve using hertz model, which of the following variable depends on the sample deformation depth Zs?

• Spherical tip radius R

• Cone tip half angle alpha

• Contact radius r

• Scan speed

To obtain a force distance curve, how is the sample deformation obtained experimentally?

• Subtract cantilever deflection from positioner motion

• Divide tip sample interaction force by cantilever stiffness

• Divide tip sample interaction force by sample Young’s modulus

• Divide contact radius squared by tip radius

For Kelvin Probe Force Microscopy, the sample is typically scanned twice for each line. What is the purpose of doing so?

• Average the data to reduce variance

• Repeat scan to improve accuracy in scanning

• Tune the controller gains based on first scan result

• Reduce the effect of topography in surface potential measurement

Which category does contact resonance imaging belong to?

• Contact mode

• Dynamic mode

• Jumping mode

• Hybrid mode

Which of the following modes use the cantilever as a local antenna to amplify electromagnetic waves and inject vibration signature for high spatial resolution imaging?

• Amplitude modulation AFM (AM)

• Scattering-type Scanning Nearfield Optical Microscopy (sSNOM)

• Lateral force microscopy (LFM)

• Scanning Spreading Resistance Microscopy (SSRM)