Features

Gwyscope Digital Signal Processor is being constantly developed, therefore the presented features can be outdated, but contain at least:

• feedback loop for contact and non-contact optical lever based SPM probes
• feedback loop for self-sensing probes (e.g. Akiyama) using FM detection via PLL
• z piezo signal output through 20-bit DA converter
• 16 simultaneously sampled 18-bit inputs
• 16 independent 16-bit outputs
• reconfigurable input and output voltage ranges
• two lock in amplifiers with signal generators 500 Hz to 1.2 MHz
• third internal generator for lock-in operation at other than generating frequency
• lateral motion control using serial interface or 20 bit DA converters
• variety of ways how to perform non-raster and adaptive measurements

Depending on the rest of the hardware and control software it can be  used for various SPM tasks, so far it was used for the following:

• Atomic Force Microscopy and Force-Distance curves acquistion
• Magnetic Force Microscopy in the lift mode
• Conductive AFM, Scanning Thermal Microscopy and other additional signal based SPM methods
• AM Kelvin Probe Force Microscopy
• Sideband FM Electrostatic Force Microscopy
• Force Volume data acquisition

Few images of measured structures are shown below:

Silicon carbide steps measured using Akiyama probe and a quick laboratory setup on an optical table.

Nanosensors fun grating measured using custom built tapping mode AFM