Doubling up can be quite the question in very many aspects of life, though in a controlled laboratory, the thought of doing so can raise quite a few eyebrows. Science is exact, of course, and all aspects of surface science require precision and a degree of restraint. Hamfistedness is certainly not a desirable aspect of any scientist, and the Nanonis dual oscillation controller, which is part of the manufacturer’s range of Nanonis Oscillation controllers is worth getting quite excited about. It really isn’t a matter of simply “doubling up” per say, it’s more tapping into methods which a single oscillation controller just simply doesn’t have the strength to use – essentially opening up a brand new world which is just beneath the surface.
Understanding how it works does require the basic understanding of how any oscillation controller works. While indeed a typical oscillation controller adds dynamic AFM capabilities on a multifrequency to any controller with Z-feedback regulating signals coming from the mechanical resonator, imaging is between non-contact AFM, intermittent contact, and of course phase imaging and dissipation. A single Oscillation Controller runs usually around 5MHz – though of course can be further extended for Kelvin probe applications, for instance.
In the aspect of a dual oscillation controller, topographical AFM imaging is further extended by taking advantage of much further excitation frequencies. For instance, the Nanonis Dual Oscillation Controller can open up a world never before seen.
The electrical and mechanical properties of the material can be laid bare by tapping into these frequencies, and it is very possible to operate a dual oscillation controller as a lock-in amplifier or a phase lock loop in order to experience a wealth of brand new AFM modes.
Essentially, for a whole range of experiments and measurements, the utilisation of a dual oscillation controller is imperative. It’s not a matter of efficiency, it’s more accurate results, in measurements which simply are not accessible through conventional means. Nanonis is a major player in the supply of dual oscillation controllers, supplied by Scanwel in North Wales.