Sampling Intelligent Scan (SIS)
In SIS mode, probe approaches each measurement point and acquires topography and physical property information, followed by retracting from the sample and moving to the next measurement point. It is an intelligent measurement mode that can adjust the scan speed according to sample surface.
SIS solved problems occurred in conventional AFM by reducing the lateral tip/sample interactions. This enables stabilized measurements, particularly on soft and adhesive samples as well as samples with high aspect ratio structures.
When used in the Current Mode for a soft material, SIS allows the stable acquisition of topographic image without damaging the sample. SIS is also effective in the Phase Mode (PM): SIS-PM eliminates the effects of sample topography, which may cause artifacts in PM imaging.
Conceptual diagram of SIS-Topo* scanning movements
Probe and sample make contact only when getting data. Aside from this, scanning speed drops when moving at high speeds in the horizontal direction while on stand by in mid-air and when in contact with the sample surface; and shelter motions that rise from the sample surface are automatically performed.
1.Measuring high aspect ratio structures
Comparison between DFM and SIS-Topo: Measuring deep trenches by using conventional DFM cantilevers
DFM(Conventional tapping mode)
High aspect ratio structures: Polytetrafluoroethylene sheet
* SIS‐Topo:eliminates effects from horizontal direction and accurately scans high aspect ratio structures.
2.Observation of adhesives
DFM cannot get a clear image of the phase or the topography of soft and adhesive surfaces; however, SIS-Topo clearly observes both topography and phase images.
Conventional AFM/Current imaging
SIS-Property* Current imaging
* SIS-Topo is for observing topography and phase mode, while SIS-Property is for mechanical and electromagnetic property measurements.
The conventional current and AFM modes deform samples, resulting in an unstable image reflected in the scan direction for current distribution.
In contrast, SIS-Property* (Current) performs stabilized measurements for both current and topographic images without deforming the sample.