ScanAsyst

This section assumes that the user is familiar with Probe Handling and has a good understanding of general AFM operation (see Overview of AFM Operation, especially how to Align the Laser).

ScanAsyst™ is the world’s first imaging mode with automatic image optimization technology for atomic force microscopy (AFM). This patent-pending innovation frees researchers from the task of adjusting scan parameters, such as setpointOperator-selected threshold used as the target of the feedback control loop., feedback gainsThe gains are scaling factors for the error signal to determine how quickly corrections should be applied in the feedback loop. There are two important gain factors: the proportional gain scales to the current value of the error signal, and the integral gain scales the aggregate of the past values of the error signal (the "area under the curve")., and scan rate. Intelligent algorithms continuously monitor image quality to make appropriate parameter adjustments. This makes imaging as easy as simply selecting a scan area and scan size for almost any sample in either air or fluid.

ScanAsyst is based on Bruker’s patent-pending, new general-purpose imaging mode, Peak Force Tapping™. This proprietary mode performs a very fast force curve at every pixel in the image. The peak force of each of these curves is then used as the imaging feedback signal. Unlike TappingMode AFM, where imaging force is a complex function of the setpoint and other variables, Peak Force Tapping provides direct force control. Peak Force Tapping mode modulates the Dimension Icon Z-piezo at ~2 kHz with a default Peak Force Amplitude of 150 nm (0-peak). Increased resolution is enabled by controlling the force that the tip applies to the sample, thereby decreasing the deformation depths and the consequential contact area between the tip and sample. Because the deformation depths and lateral forces are small, there is minimal damage to the probe or sample. Also, because Peak Force Tapping mode does not resonate the cantilever, cantilever tuning is not required. This is particularly advantageous in fluids.

ScanAsyst enables auto-optimization of Peak Force Tapping mode scanning parameters, including gains, setpoint and scan rate. Together, these capabilities make ScanAsyst the most powerful and productive way to use AFM to rapidly obtain high quality images.

ScanAsyst is intended to be the first choice imaging mode for NanoScope version 8.10 and later software.

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