Atomic force microscopy study of the Amazonian blue butterfly with what mode of operation

1, working mode: contact mode, the tip of the needle and the sample surface gently contact, adjust the distance between the tip of the needle and the sample, so that the micro-cantilever bending morphology in the horizontal scanning process to maintain a certain amount, that is, to make the probe a sample of the force between the samples to maintain a certain amount. Under this feedback mechanism, the displacement of the scanner in the vertical direction is recorded, and the probe is scanned on the surface of the sample to obtain a complete image of the topographical changes.

2, non-contact mode: the tip of the needle vibrates above the surface of the sample crystal, never in contact with the sample, the probe monitor detects the Van der Waals force and electrostatic force, etc. on the image of the sample suspension of the non-destructive long-range force.

3. Tap mode: A small bed electro-ceramic element drives the micro-cantilever to vibrate at a frequency just above the lowest mechanical **** vibration frequency of the probe (?50kHz). Since the vibration frequency of the probe is close to its *** vibration frequency, it can amplify the driving signal. When this forced vibration probe is adjusted to the surface of the sample (typically 2?20 nm), a weak attraction is created between the probe and the sample surface and Z. This attraction also causes the probe to move away from the surface of the sample. This attraction also causes the *** vibration frequency of the probe to decrease, the difference between the drive frequency and the *** vibration frequency to increase, and the amplitude of the probe tip to decrease. This change in amplitude can be detected by laser detection, which can be inferred from the sample surface fluctuations.